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1321804
1321804
Narration for corporate sales/promo project about specialized safety products. This production is meant to be informative without a hard sell, since these products save lives. Age of the narrator is not critical, but the audience will tend to be middle-aged. Delivery of the production will be via DVD and VHS tape. Budget is $300-500 if possible. If the talent is really good, a little more is possible.
The pronunciation of the company is between Salls-berry and Sollsberry (just like Salisbury Steak). Here's the script...
Aug 26, 2004 14:27:45 (GMT -05:00) Eastern Time (US & Canada) Sep 02, 2004 00:00:00 (GMT -05:00) Eastern Time (US & Canada) No (click here to learn more about
)
Closed
191
31
0 direct invitation(s) have been sent by the voice seeker resulting in 0 audition(s) and/or proposal(s) so far.
The pronunciation of the company is between Salls-berry and Sollsberry (just like Salisbury Steak). Here's the script...
Aug 26, 2004 14:27:45 (GMT -05:00) Eastern Time (US & Canada) Sep 02, 2004 00:00:00 (GMT -05:00) Eastern Time (US & Canada) No (click here to learn more about
)
Closed
191
31
0 direct invitation(s) have been sent by the voice seeker resulting in 0 audition(s) and/or proposal(s) so far.
Project Parameters
None
To be defined
Promos
English - North American
Not defined
Middle Age Female OR Middle Age Male
Not defined
There are no special pre-, post-, or production requirements for this project.
Not defined
Not defined
No
Not defined
Script Details
Yes
AUDIO/NARRATION
"Salisbury - the leader in the development and manufacturing of electrical protective equipment for worker safety — setting industry standards since 1855."
Beginning in the early 1920's, Salisbury pioneered the manufacture of linemen's rubber protective equipment. Starting with a request from a group of safety engineers from Commonwealth Edison in Chicago, then President M.B. Salisbury set forth to develop the company's first electrical safety product - linehose. After many design changes and consultation with the Commonwealth Edison engineers, the final product was developed and received a patent in 1924. Linehose was rapidly accepted by most major power companies in the United States, leading to the development of many new products for electrical safety. Each new product was thoroughly tested in the field and laboratory to insure the maximum protection from electrical hazards.
Over the last 80 years plus, Salisbury has continued to be the leader in the manufacture of rubber protective equipment and electrical safety products. Our commitment to your safety is evident in the care we take during the manufacturing process of our electrical safety products. In the next few minutes, we'll take a look at various products we make and the different processes it takes to produce them. Each step of the process is vital to protect the lives of the people that use them. Let's start with rubber insulating gloves…
Every step in the manufacturing process is critical to insure that rubber-insulating gloves will provide maximum protection from shock and potential electrocution. The process starts with the selection of the highest quality natural rubber. Strict requirements for purity are essential to guarantee the rubber will be suitable for insulating products.
Once the rubber arrives, it is cut into small sections and begins the process of mixing on a machine called a mill. During this mixing process, various ingredients are added including color, antioxidants, and the curing agents. A sample from batch is taken and evaluated to insure it meets the required standards for viscosity. After the mixing is complete, slabs of rubber are cut off in preparation for the next stage of processing. Each batch of rubber is assigned a unique quality control number that will accompany it throughout the manufacturing process. This allows us to monitor each phase of production and have a permanent record of the rubber used in each batch of gloves produced.
In this stage, the rubber is placed into large mixers containing solvent. The solvents used must be monitored and tested for purity and proper concentration. It takes about 24 hours for the rubber to completely dissolve. Once this process is complete, the rubber is filtered to remove any contaminants and transferred to the dipping tanks.
The dipping process is tightly monitored for quality control purposes. Double-sided racks of porcelain hand forms are utilized to maximize production capacity. The overall dipping process can take up to several days for some racks, depending on the voltage class of the gloves being produced. The thicker the gloves, the longer the process takes to complete. Each dipping cycle has various speed settings during the immersion process to avoid entrapment of air on the surface of the glove, which would result in a defective product. After each dip cycle is completed, the rack is rotated to insure an even coating of rubber is maintained on the porcelain form. The rack then moves to a drying tunnel where the solvent is allowed to evaporate, leaving behind a solid layer of rubber. This process is repeated until the desired thickness of rubber is achieved. In the case of two color gloves, the process includes an inner layer of red or yellow rubber with a thinner outer layer of black rubber. As we’ll see later, the two-color glove provides a helpful visual indicator for the user to easily see if there has been damage to the glove.
After the proper thickness of rubber is achieved, the racks are sent for final detailing. This includes rolling the beaded cuff – a process that must be done by hand, applying the identification label as required by ASTM and International Standards, and any other markings such as manufacturing codes. After these steps are complete, it’s on to the curing stage. The curing stage uses high heat and pressure to vulcanize the rubber. Simply put, it’s a pressure cooker for rubber! Prior to curing, the rubber has no mechanical strength and could be easily torn or damaged. After curing, the rubber reaches its maximum strength and performance characteristics associated with Salisbury electrical insulating rubber gloves.
The gloves are now ready for the chlorination stage. The Chlorination process makes the surface of the rubber smoother and therefore easier to put on and take off the gloves. Cured gloves are placed in a rotating tank of chlorinated water and tumbled until they reach the desired feel. After chlorination, the gloves are rinsed and allowed to dry.
The next step in the manufacturing process involves a thorough visual examination of the gloves. The inspectors look for any flaws that could make the gloves unsafe to use. Even the slightest blemish will result in the glove being unfit for use. Great care is taken in this step to insure the highest possible level of accuracy. All gloves that pass the visual inspection are then electrically tested to ASTM and international specifications to prove their ability to withstand high voltage in the field. Each glove receives a three-minute electrical test at the appropriate voltage level. ASTM specifications requires voltage be applied at the “proof-test” level, which is higher than the maximum use voltage. This extra amount of voltage during testing provides an added safety margin for the users of the gloves up to their maximum use voltage. For example, a class 2 glove is tested at 20,000 volts a.c., but has a maximum use voltage of 17,000 volts a.c. During this process, leakage current is monitored and measured in mA – Milliampere.
After the electrical testing is completed, the gloves are carefully packaged and sent to customers throughout the world.
Dipped rubber sleeves are produced in much the same way as gloves. The porcelain forms are much larger for sleeves, but the overall dipping process is quite similar. As with gloves, the finished rolls and beads are done by hand, along with all labeling. Each sleeve is visually tested to check for any manufacturing flaws or other contamination that would make them unsafe. Just as with gloves, each sleeve undergoes a three-minute electrical test and extensive visual inspection prior to shipment.
Dipping is just one of the manufacturing techniques we use at Salisbury to produce rubber insulating products. Another technique we use is rubber molding. There are two types of molding – compression and injection. As with dipping, the rubber used in the molding process must be mixed and prepared to insure it will provide maximum electrical insulating properties and a long service life. Unlike the dipping process, the rubber is not added to liquid solvent. Instead, it is prepared according to the specifications of the product being made and the manufacturing process. This includes color, curing agents, and the type of rubber. The mixing is done on different types of machinery — all with the ultimate goal of producing rubber that is suited for the molding process and the final product.
Let’s take a look at the injection molding process… After the rubber is mixed, it is brought to the injection molding machines. Injection molding is a process that involves forcing the rubber into a mold designed with internal shapes of the final product. The molds are precision-made equipment, with very exacting tolerances to insure product uniformity. After sufficient rubber is squeezed into the mold, internal pressure is maintained along with heat for a specific duration, causing the rubber to cure. Here we see molded rubber sleeves being produced. Salisbury is the only manufacturer that produces molded rubber sleeves that comply with ASTM specifications. After the curing process is complete, the mold is removed and the sleeves are taken out. Any required trimming of excess rubber is done, followed by visual and electrical tests of every sleeve. Just as with gloves, any molded products with defects are immediately destroyed.
Salisbury produces linehose with injection molding as well. We’re the only manufacturer of linehose to use this method. Here we see how the technique used for linehose is almost identical to the molded sleeve process. We also produce linehose with the extrusion process. Extrusion involves forcing rubber through special patterns or dies that create a specific profile in a tubular fashion. Once the extrusion is complete, the rubber is cured in vulcanizers and then cut to specific lengths.
Compression molding produces rubber blankets and other products. For blankets, pre-determined sized pieces of rubber are prepared on special equipment prior to the molding process. These pieces are then placed in the blanket molds. The molds are closed and placed inside large presses, which put tremendous pressure and heat on the molds. The combination of pressure and heat causes the curing process to begin. After the curing process is complete, the mold is removed and the blanket is taken out. Any required trimming of excess rubber is done, followed by required visual inspections and electrical testing of every blanket.
Salisbury offers two types of rubber in many of our products. For many years, the most common rubber used was natural rubber. To this day, it is used extensively in the production of gloves and sleeves. It offers very high strength, excellent dielectric capabilities, and the most stretch and flexibility. In recent years, more and more of our products are also produced from a synthetic rubber called EPDM. Salcor is Salisbury’s trade name for our specially formulated Type II synthetic rubber. It offers many of the same characteristics as natural rubber, but with an added feature – it is completely resistant to ozone and corona cutting. For many applications, it is the rubber of choice – especially in very high voltage situations or areas where excessive ozone is being generated.
The products we’ve just seen being manufactured are just a part of the Salisbury lineup of rubber insulating equipment. Each product is carefully designed and manufactured to guarantee the highest possible level of safety for the user. Many years of testing and process controls are behind every product we make. This is part of our commitment to stay at the forefront of the industry AND to help insure your safety!
New Section: Field Inspection and Safety
After Salisbury makes the products, the burden of safety falls on the user in the field. Rubber insulating equipment is made to exacting standards and very safe when used properly. However, all rubber products can be easily damaged and quickly become unsafe for use at ANY voltage. We’re now going to take a detailed look at what you can do to protect your equipment and make sure it keeps you safe on the job.
First, let’s take a look at the standards on rubber goods safety. ASTM, the American Society for Testing and Materials, writes the standards on all rubber protective equipment. These standards are written by an extensive cross-section of people from all backgrounds, including users, such as power companies, the manufacturers, testing labs, and others. Salisbury is a very active member of ASTM. We have staff members who are chair people at the ASTM committee meetings that occur several times each year. We strongly encourage development of existing standards to make sure they are written with employee safety in mind. This is an ongoing process that occurs all year, not just at the meetings. Salisbury is active on working with various standard writing organizations to insure the highest level of safety.
Through the years, ASTM has developed very precise standards for the manufacture and field care of rubber insulating products. Let’s take a look at the common threads of these standards and how they protect the workforce…
There are five classes of rubber protective equipment, each with their own voltage ratings (use the Salisbury ASTM chart for this graphic):
Class 00, tested at 2500 AC volts – maximum use voltage of 500 AC volts
Class 0, tested at 5000 AC volts – maximum use voltage of 1000 AC volts
Class 1, tested at 10,000 AC volts – maximum use voltage of 7000 AC volts
Class 2, tested at 20,000 AC volts – maximum use voltage of 17,000 AC volts
Class 3, tested at 30,000 AC volts – maximum use voltage of 26,500 AC volts
Class 4, tested at 40,000 AC volts – maximum use voltage of 36,000 ac volts
ASTM specifications requires voltage be applied at the “proof-test” level, which is higher than the actual maximum use voltage. This extra amount of voltage testing provides an added safety margin for the users of the gloves up to their rated maximum use voltage. For example, a class 2 glove is tested at 20,000 volts a.c., but has a maximum use voltage of 17,000 volts a.c. All gloves, sleeves, and blankets must undergo periodic electrical testing to insure they are still safe to use. The maximum interval allowed between tests varies for each product type, but is typically 6 months for gloves and 12 months for sleeves and blankets.
To insure your safety in the field, you need to check your rubber equipment everyday before you use it. Because rubber can be easily damaged, there are several important things to remember when you’re inspecting your equipment…
1. Avoid prolonged exposure to excessive levels of heat. Heat can weaken the rubber over time and make it unsafe for voltage protection.
2. Keep chemicals and solvents away from the rubber goods. Depending on the chemical, it can destroy the rubber in a matter of minutes, rendering the equipment useless for protection. If chemicals get on the gloves, wash them off immediately and check for any damage to the rubber such as soft spots, swelling, or other recent changes in the appearance of the product.
3. For type I natural rubber products, avoid prolonged exposure to ozone-generating equipment or the sun. Relatively low levels of prolonged exposure to ozone can cause natural rubber to start cracking very quickly. This causes the product to become unsafe to use and cannot be reversed.
For all Salisbury rubber products, avoid sharp or abrasive materials in the workplace. Any kind of cut or tear in the rubber can be extremely dangerous since the electrical current can easily pass through weakened or torn areas of the protective equipment.
We’ll now demonstrate some of the techniques for product inspection in the field. Here you can see how the glove test is done. Carefully roll the glove up so that it traps air inside. Now you can check for any visual defects, including cuts, tears, ozone damage, and chemical contamination. If you find any serious damage, especially if you can see the red or yellow layer of rubber through the black layer, do not use the glove! It won’t properly protect you from high voltage. When you conduct this test, avoid wearing rings, jewelry, or anything sharp that may damage the rubber. Also, make sure your hands are clean to avoid getting rubber-damaging chemicals on the gloves. Another option available for field inspection is the Salisbury G-99 glove inflator. As you can see, it is the most efficient and complete way of visually inspecting gloves when you’re in the field.
For rubber sleeves, you should examine the entire surface area to check for any signs of damage to the rubber. Since you can’t inflate them, stretching the sleeves – as shown in the demonstration – will help you find any dangerous flaws.
Rubber blankets should be laid flat and rolled from corner to corner looking for damage to the equipment. This should be performed twice on each side, with the second time done at a 90-degree angle from the first inspection. The same process should be repeated on the other side.
Linehose and other rubber products should also be thoroughly inspected prior to each use. With linehose, you must also inspect the inside. While this can be difficult, there are tools available to help pry apart the opening.
Salisbury has many products available to help protect your rubber goods. When used properly, they can greatly reduce the risk of accidental damage to all rubber products. These include:
Leather protector gloves: These are leather gloves that are designed to fit over the rubber gloves. Not just any leather glove will do. They must conform to ASTM specifications for the proper manufacture of protector gloves. Their primary purpose is to protect rubber gloves from damage from sharp or abrasive objects. They can be made from various types of leather including cowhide, goatskin, and pigskin. Protector gloves must also be properly cared for. For example, if they become contaminated with oil-based chemicals, these can seep through the leather and reach the rubber glove below. The rubber glove would then begin to degrade from the oil contamination.
Leather protectors must be chosen carefully to make sure they are safe for the voltage class of rubber gloves being used. Here’s the formula that you must follow to make sure you’ve chosen the right protectors:
For each 10,000 volts of rating, a minimum of one inch of separation is required between the top of the protector cuff and the rolled bead of the rubber glove. For Class 00 and 0 a minimum of one half inch of separation is required between the top of the protector and rubber gloves.
This requirement was developed to minimize the risk of electrical flashover from the surface of the protector glove to the exposed skin of the user.
Salisbury makes a full line of canvas bags for gloves and sleeves. These bags help protect the gloves and sleeves when they’re not in use. Proper storage can extend the usable life of the product. Folds and creases may strain Type I natural rubber and can cause it to crack from ozone exposure. By storing gloves and sleeves in the correct bag and NEVER forcing more than one pair in each bag, the risk of folds and creases is eliminated. Just as with protectors, the bags should be kept clean and dry. If they become contaminated, discard them and use a new one.
For blanket storage, Salisbury offers a full line of bright orange polyethylene canisters. They are available in several sizes for storage of up to six blankets. Canisters provide excellent protection for blankets when they are not in use. In addition, they can provide an easy method of transporting blankets to remote locations in the field. This is especially true of the newest Salisbury canister, the P4-H with a handle over the entire length of the tube.
Salisbury also offers a full line of products to help workers who use rubber protective equipment:
Glove inner-liners for user comfort year-round
· 10-4 glove dust to help absorb perspiration for easier donning and doffing.
· Rubout is a specialized hand cleaner for dry or wet use that helps eliminate grease, oil, and other contaminants from your hands that could otherwise damage the rubber
· Salco cleaner to remove potentially dangerous compounds from your rubber goods
We’ve only covered a small number of the products Salisbury makes for workers exposed to electrical workers. Whether its rubber protective equipment, arc-flash clothing, grounding equipment, insulators, or any of our other products, you can count on Salisbury for the most complete line of electrical safety protective equipment and accessories anywhere. We are committed to bringing you the highest quality products available and are constantly developing even better ways of helping to keep you safe!
From all of us at Salisbury, thanks for watching. We hope you have gained new insights into the process of making rubber protective equipment and how to insure your safety in the field.
Please visit our website for more product and industry information at www.whsalisbury.com. Your #1 resource for personal electrical-safety protection.
"Salisbury - the leader in the development and manufacturing of electrical protective equipment for worker safety — setting industry standards since 1855."
Beginning in the early 1920's, Salisbury pioneered the manufacture of linemen's rubber protective equipment. Starting with a request from a group of safety engineers from Commonwealth Edison in Chicago, then President M.B. Salisbury set forth to develop the company's first electrical safety product - linehose. After many design changes and consultation with the Commonwealth Edison engineers, the final product was developed and received a patent in 1924. Linehose was rapidly accepted by most major power companies in the United States, leading to the development of many new products for electrical safety. Each new product was thoroughly tested in the field and laboratory to insure the maximum protection from electrical hazards.
"Salisbury - the leader in the development and manufacturing of electrical protective equipment for worker safety — setting industry standards since 1855."
Beginning in the early 1920's, Salisbury pioneered the manufacture of linemen's rubber protective equipment. Starting with a request from a group of safety engineers from Commonwealth Edison in Chicago, then President M.B. Salisbury set forth to develop the company's first electrical safety product - linehose. After many design changes and consultation with the Commonwealth Edison engineers, the final product was developed and received a patent in 1924. Linehose was rapidly accepted by most major power companies in the United States, leading to the development of many new products for electrical safety. Each new product was thoroughly tested in the field and laboratory to insure the maximum protection from electrical hazards.
Over the last 80 years plus, Salisbury has continued to be the leader in the manufacture of rubber protective equipment and electrical safety products. Our commitment to your safety is evident in the care we take during the manufacturing process of our electrical safety products. In the next few minutes, we'll take a look at various products we make and the different processes it takes to produce them. Each step of the process is vital to protect the lives of the people that use them. Let's start with rubber insulating gloves…
Every step in the manufacturing process is critical to insure that rubber-insulating gloves will provide maximum protection from shock and potential electrocution. The process starts with the selection of the highest quality natural rubber. Strict requirements for purity are essential to guarantee the rubber will be suitable for insulating products.
Once the rubber arrives, it is cut into small sections and begins the process of mixing on a machine called a mill. During this mixing process, various ingredients are added including color, antioxidants, and the curing agents. A sample from batch is taken and evaluated to insure it meets the required standards for viscosity. After the mixing is complete, slabs of rubber are cut off in preparation for the next stage of processing. Each batch of rubber is assigned a unique quality control number that will accompany it throughout the manufacturing process. This allows us to monitor each phase of production and have a permanent record of the rubber used in each batch of gloves produced.
In this stage, the rubber is placed into large mixers containing solvent. The solvents used must be monitored and tested for purity and proper concentration. It takes about 24 hours for the rubber to completely dissolve. Once this process is complete, the rubber is filtered to remove any contaminants and transferred to the dipping tanks.
The dipping process is tightly monitored for quality control purposes. Double-sided racks of porcelain hand forms are utilized to maximize production capacity. The overall dipping process can take up to several days for some racks, depending on the voltage class of the gloves being produced. The thicker the gloves, the longer the process takes to complete. Each dipping cycle has various speed settings during the immersion process to avoid entrapment of air on the surface of the glove, which would result in a defective product. After each dip cycle is completed, the rack is rotated to insure an even coating of rubber is maintained on the porcelain form. The rack then moves to a drying tunnel where the solvent is allowed to evaporate, leaving behind a solid layer of rubber. This process is repeated until the desired thickness of rubber is achieved. In the case of two color gloves, the process includes an inner layer of red or yellow rubber with a thinner outer layer of black rubber. As we’ll see later, the two-color glove provides a helpful visual indicator for the user to easily see if there has been damage to the glove.
After the proper thickness of rubber is achieved, the racks are sent for final detailing. This includes rolling the beaded cuff – a process that must be done by hand, applying the identification label as required by ASTM and International Standards, and any other markings such as manufacturing codes. After these steps are complete, it’s on to the curing stage. The curing stage uses high heat and pressure to vulcanize the rubber. Simply put, it’s a pressure cooker for rubber! Prior to curing, the rubber has no mechanical strength and could be easily torn or damaged. After curing, the rubber reaches its maximum strength and performance characteristics associated with Salisbury electrical insulating rubber gloves.
The gloves are now ready for the chlorination stage. The Chlorination process makes the surface of the rubber smoother and therefore easier to put on and take off the gloves. Cured gloves are placed in a rotating tank of chlorinated water and tumbled until they reach the desired feel. After chlorination, the gloves are rinsed and allowed to dry.
The next step in the manufacturing process involves a thorough visual examination of the gloves. The inspectors look for any flaws that could make the gloves unsafe to use. Even the slightest blemish will result in the glove being unfit for use. Great care is taken in this step to insure the highest possible level of accuracy. All gloves that pass the visual inspection are then electrically tested to ASTM and international specifications to prove their ability to withstand high voltage in the field. Each glove receives a three-minute electrical test at the appropriate voltage level. ASTM specifications requires voltage be applied at the “proof-test” level, which is higher than the maximum use voltage. This extra amount of voltage during testing provides an added safety margin for the users of the gloves up to their maximum use voltage. For example, a class 2 glove is tested at 20,000 volts a.c., but has a maximum use voltage of 17,000 volts a.c. During this process, leakage current is monitored and measured in mA – Milliampere.
After the electrical testing is completed, the gloves are carefully packaged and sent to customers throughout the world.
Dipped rubber sleeves are produced in much the same way as gloves. The porcelain forms are much larger for sleeves, but the overall dipping process is quite similar. As with gloves, the finished rolls and beads are done by hand, along with all labeling. Each sleeve is visually tested to check for any manufacturing flaws or other contamination that would make them unsafe. Just as with gloves, each sleeve undergoes a three-minute electrical test and extensive visual inspection prior to shipment.
Dipping is just one of the manufacturing techniques we use at Salisbury to produce rubber insulating products. Another technique we use is rubber molding. There are two types of molding – compression and injection. As with dipping, the rubber used in the molding process must be mixed and prepared to insure it will provide maximum electrical insulating properties and a long service life. Unlike the dipping process, the rubber is not added to liquid solvent. Instead, it is prepared according to the specifications of the product being made and the manufacturing process. This includes color, curing agents, and the type of rubber. The mixing is done on different types of machinery — all with the ultimate goal of producing rubber that is suited for the molding process and the final product.
Let’s take a look at the injection molding process… After the rubber is mixed, it is brought to the injection molding machines. Injection molding is a process that involves forcing the rubber into a mold designed with internal shapes of the final product. The molds are precision-made equipment, with very exacting tolerances to insure product uniformity. After sufficient rubber is squeezed into the mold, internal pressure is maintained along with heat for a specific duration, causing the rubber to cure. Here we see molded rubber sleeves being produced. Salisbury is the only manufacturer that produces molded rubber sleeves that comply with ASTM specifications. After the curing process is complete, the mold is removed and the sleeves are taken out. Any required trimming of excess rubber is done, followed by visual and electrical tests of every sleeve. Just as with gloves, any molded products with defects are immediately destroyed.
Salisbury produces linehose with injection molding as well. We’re the only manufacturer of linehose to use this method. Here we see how the technique used for linehose is almost identical to the molded sleeve process. We also produce linehose with the extrusion process. Extrusion involves forcing rubber through special patterns or dies that create a specific profile in a tubular fashion. Once the extrusion is complete, the rubber is cured in vulcanizers and then cut to specific lengths.
Compression molding produces rubber blankets and other products. For blankets, pre-determined sized pieces of rubber are prepared on special equipment prior to the molding process. These pieces are then placed in the blanket molds. The molds are closed and placed inside large presses, which put tremendous pressure and heat on the molds. The combination of pressure and heat causes the curing process to begin. After the curing process is complete, the mold is removed and the blanket is taken out. Any required trimming of excess rubber is done, followed by required visual inspections and electrical testing of every blanket.
Salisbury offers two types of rubber in many of our products. For many years, the most common rubber used was natural rubber. To this day, it is used extensively in the production of gloves and sleeves. It offers very high strength, excellent dielectric capabilities, and the most stretch and flexibility. In recent years, more and more of our products are also produced from a synthetic rubber called EPDM. Salcor is Salisbury’s trade name for our specially formulated Type II synthetic rubber. It offers many of the same characteristics as natural rubber, but with an added feature – it is completely resistant to ozone and corona cutting. For many applications, it is the rubber of choice – especially in very high voltage situations or areas where excessive ozone is being generated.
The products we’ve just seen being manufactured are just a part of the Salisbury lineup of rubber insulating equipment. Each product is carefully designed and manufactured to guarantee the highest possible level of safety for the user. Many years of testing and process controls are behind every product we make. This is part of our commitment to stay at the forefront of the industry AND to help insure your safety!
New Section: Field Inspection and Safety
After Salisbury makes the products, the burden of safety falls on the user in the field. Rubber insulating equipment is made to exacting standards and very safe when used properly. However, all rubber products can be easily damaged and quickly become unsafe for use at ANY voltage. We’re now going to take a detailed look at what you can do to protect your equipment and make sure it keeps you safe on the job.
First, let’s take a look at the standards on rubber goods safety. ASTM, the American Society for Testing and Materials, writes the standards on all rubber protective equipment. These standards are written by an extensive cross-section of people from all backgrounds, including users, such as power companies, the manufacturers, testing labs, and others. Salisbury is a very active member of ASTM. We have staff members who are chair people at the ASTM committee meetings that occur several times each year. We strongly encourage development of existing standards to make sure they are written with employee safety in mind. This is an ongoing process that occurs all year, not just at the meetings. Salisbury is active on working with various standard writing organizations to insure the highest level of safety.
Through the years, ASTM has developed very precise standards for the manufacture and field care of rubber insulating products. Let’s take a look at the common threads of these standards and how they protect the workforce…
There are five classes of rubber protective equipment, each with their own voltage ratings (use the Salisbury ASTM chart for this graphic):
Class 00, tested at 2500 AC volts – maximum use voltage of 500 AC volts
Class 0, tested at 5000 AC volts – maximum use voltage of 1000 AC volts
Class 1, tested at 10,000 AC volts – maximum use voltage of 7000 AC volts
Class 2, tested at 20,000 AC volts – maximum use voltage of 17,000 AC volts
Class 3, tested at 30,000 AC volts – maximum use voltage of 26,500 AC volts
Class 4, tested at 40,000 AC volts – maximum use voltage of 36,000 ac volts
ASTM specifications requires voltage be applied at the “proof-test” level, which is higher than the actual maximum use voltage. This extra amount of voltage testing provides an added safety margin for the users of the gloves up to their rated maximum use voltage. For example, a class 2 glove is tested at 20,000 volts a.c., but has a maximum use voltage of 17,000 volts a.c. All gloves, sleeves, and blankets must undergo periodic electrical testing to insure they are still safe to use. The maximum interval allowed between tests varies for each product type, but is typically 6 months for gloves and 12 months for sleeves and blankets.
To insure your safety in the field, you need to check your rubber equipment everyday before you use it. Because rubber can be easily damaged, there are several important things to remember when you’re inspecting your equipment…
1. Avoid prolonged exposure to excessive levels of heat. Heat can weaken the rubber over time and make it unsafe for voltage protection.
2. Keep chemicals and solvents away from the rubber goods. Depending on the chemical, it can destroy the rubber in a matter of minutes, rendering the equipment useless for protection. If chemicals get on the gloves, wash them off immediately and check for any damage to the rubber such as soft spots, swelling, or other recent changes in the appearance of the product.
3. For type I natural rubber products, avoid prolonged exposure to ozone-generating equipment or the sun. Relatively low levels of prolonged exposure to ozone can cause natural rubber to start cracking very quickly. This causes the product to become unsafe to use and cannot be reversed.
For all Salisbury rubber products, avoid sharp or abrasive materials in the workplace. Any kind of cut or tear in the rubber can be extremely dangerous since the electrical current can easily pass through weakened or torn areas of the protective equipment.
We’ll now demonstrate some of the techniques for product inspection in the field. Here you can see how the glove test is done. Carefully roll the glove up so that it traps air inside. Now you can check for any visual defects, including cuts, tears, ozone damage, and chemical contamination. If you find any serious damage, especially if you can see the red or yellow layer of rubber through the black layer, do not use the glove! It won’t properly protect you from high voltage. When you conduct this test, avoid wearing rings, jewelry, or anything sharp that may damage the rubber. Also, make sure your hands are clean to avoid getting rubber-damaging chemicals on the gloves. Another option available for field inspection is the Salisbury G-99 glove inflator. As you can see, it is the most efficient and complete way of visually inspecting gloves when you’re in the field.
For rubber sleeves, you should examine the entire surface area to check for any signs of damage to the rubber. Since you can’t inflate them, stretching the sleeves – as shown in the demonstration – will help you find any dangerous flaws.
Rubber blankets should be laid flat and rolled from corner to corner looking for damage to the equipment. This should be performed twice on each side, with the second time done at a 90-degree angle from the first inspection. The same process should be repeated on the other side.
Linehose and other rubber products should also be thoroughly inspected prior to each use. With linehose, you must also inspect the inside. While this can be difficult, there are tools available to help pry apart the opening.
Salisbury has many products available to help protect your rubber goods. When used properly, they can greatly reduce the risk of accidental damage to all rubber products. These include:
Leather protector gloves: These are leather gloves that are designed to fit over the rubber gloves. Not just any leather glove will do. They must conform to ASTM specifications for the proper manufacture of protector gloves. Their primary purpose is to protect rubber gloves from damage from sharp or abrasive objects. They can be made from various types of leather including cowhide, goatskin, and pigskin. Protector gloves must also be properly cared for. For example, if they become contaminated with oil-based chemicals, these can seep through the leather and reach the rubber glove below. The rubber glove would then begin to degrade from the oil contamination.
Leather protectors must be chosen carefully to make sure they are safe for the voltage class of rubber gloves being used. Here’s the formula that you must follow to make sure you’ve chosen the right protectors:
For each 10,000 volts of rating, a minimum of one inch of separation is required between the top of the protector cuff and the rolled bead of the rubber glove. For Class 00 and 0 a minimum of one half inch of separation is required between the top of the protector and rubber gloves.
This requirement was developed to minimize the risk of electrical flashover from the surface of the protector glove to the exposed skin of the user.
Salisbury makes a full line of canvas bags for gloves and sleeves. These bags help protect the gloves and sleeves when they’re not in use. Proper storage can extend the usable life of the product. Folds and creases may strain Type I natural rubber and can cause it to crack from ozone exposure. By storing gloves and sleeves in the correct bag and NEVER forcing more than one pair in each bag, the risk of folds and creases is eliminated. Just as with protectors, the bags should be kept clean and dry. If they become contaminated, discard them and use a new one.
For blanket storage, Salisbury offers a full line of bright orange polyethylene canisters. They are available in several sizes for storage of up to six blankets. Canisters provide excellent protection for blankets when they are not in use. In addition, they can provide an easy method of transporting blankets to remote locations in the field. This is especially true of the newest Salisbury canister, the P4-H with a handle over the entire length of the tube.
Salisbury also offers a full line of products to help workers who use rubber protective equipment:
Glove inner-liners for user comfort year-round
· 10-4 glove dust to help absorb perspiration for easier donning and doffing.
· Rubout is a specialized hand cleaner for dry or wet use that helps eliminate grease, oil, and other contaminants from your hands that could otherwise damage the rubber
· Salco cleaner to remove potentially dangerous compounds from your rubber goods
We’ve only covered a small number of the products Salisbury makes for workers exposed to electrical workers. Whether its rubber protective equipment, arc-flash clothing, grounding equipment, insulators, or any of our other products, you can count on Salisbury for the most complete line of electrical safety protective equipment and accessories anywhere. We are committed to bringing you the highest quality products available and are constantly developing even better ways of helping to keep you safe!
From all of us at Salisbury, thanks for watching. We hope you have gained new insights into the process of making rubber protective equipment and how to insure your safety in the field.
Please visit our website for more product and industry information at www.whsalisbury.com. Your #1 resource for personal electrical-safety protection.
"Salisbury - the leader in the development and manufacturing of electrical protective equipment for worker safety — setting industry standards since 1855."
Beginning in the early 1920's, Salisbury pioneered the manufacture of linemen's rubber protective equipment. Starting with a request from a group of safety engineers from Commonwealth Edison in Chicago, then President M.B. Salisbury set forth to develop the company's first electrical safety product - linehose. After many design changes and consultation with the Commonwealth Edison engineers, the final product was developed and received a patent in 1924. Linehose was rapidly accepted by most major power companies in the United States, leading to the development of many new products for electrical safety. Each new product was thoroughly tested in the field and laboratory to insure the maximum protection from electrical hazards.
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