CODES - An Understanding for Electrical Rubber Gloves
OEL rubber gloves being worn by electrical worker
Rubber insulating gloves are crucial safety equipment for workers exposed to electrical hazards. To ensure these gloves provide the necessary protection, they must meet specific testing standards and requirements per ASTM D120 and F496, NFPA 70E Article 130 Section 7, and OSHA 29 CFR 1910.137
The primary testing requirements for rubber-insulating gloves are outlined by the following:
1. Dielectric Test (High Voltage Test)
Purpose: To verify the glove's ability to withstand electrical stress without breaking down or conducting electricity.
Procedure: The glove is subjected to a high-voltage AC and/or DC test, usually at 60 Hz, to confirm that it can withstand the required voltage levels without failure.
Usage Voltage Level AC (ASTM D120 Table 1 and NFPA 70E 130(C)(7)(a)): Varies depending on the glove's class:
Class 00: 500V AC
Class 0: 1,000V AC
Class 1: 7,500V AC
Class 2: 17,000V AC
Class 3: 26,500V AC
Class 4: 36,000V AC
Usage Voltage Level DC (ASTM D120 Table 1 and NFPA 70E 130(C)(7)(a)) : Varies depending on the glove's class:
Class 00: 750V DC
Class 0: 1,500V DC
Class 1: 11,250V DC
Class 2: 25,500V DC
Class 3: 39,750V DC
Class 4: 54,000V DC
Proof Test Voltage Level AC (ASTM D120 Table 1): Varies depending on the class:
Class 00: 2,500V AC
Class 0: 5,000V AC
Class 1: 10,000V AC
Class 2: 20,000V AC
Class 3: 30,000V AC
Class 4: 40,000V AC
Proof Test Voltage Level DC (ASTM D120 Table 1): Varies depending on the class:
Class 00: 10,000V DC
Class 0: 20,000V DC
Class 1: 40,000V DC
Class 2: 50,000V DC
Class 3: 60,000V DC
Class 4: 70,000V DC
2. Insulation Resistance Test
Purpose: To check that the glove is not leaking current, ensuring it maintains insulation integrity.
Procedure: The glove must pass the test with a resistance of 10 megohms or greater. This test ensures that the glove maintains the necessary level of electrical resistance for safety.
3. Physical Testing
Inspection: Gloves are visually inspected for any signs of damage, such as cuts, holes, scraps, discoloration, or punctures.
Physical Durability: Gloves should withstand normal wear and tear, including resistance to abrasion, tears, and punctures.
Air Inflation Test (optional): To check for leaks, gloves can be inflated with air and submerged in water.
4. Physical Dimensions
Gloves must be the proper size and have the correct physical fit to ensure adequate protection. This includes checking the length of the glove and the cuff, ensuring the glove fits snugly around the wrist.
5. Testing Frequency
New Gloves: New gloves must undergo testing before they can be issued for use.
Periodic Re-testing: Once gloves are put into service, they must be tested every six months, according to standards ASTM F496 and NFPA 70 E Table 130.7(C) (7) (b) in the United States. This ensures that the gloves maintain their dielectric properties over time.
After Usage: If gloves are damaged, tested, or exposed to extreme conditions, they should be re-tested before use.
6. Storage and Maintenance
Rubber insulating gloves must be stored properly to avoid degradation. They should be kept away from direct sunlight, ozone, oils, solvents, and sharp objects, which can deteriorate the rubber.
Gloves should be cleaned using mild soap, dried after each use, and inspected for damage before each use.
7. Standards and Regulations
ASTM F496: Standard for the care and use of rubber insulating gloves.
NFPA 70 E Article 130 Section 7
IEC 60903: International standard for rubber insulating gloves.
OSHA (29 CFR 1910.137): U.S. Occupational Safety and Health Administration (OSHA) regulations require rubber gloves to be tested regularly to ensure electrical safety.
These testing procedures and standards help guarantee that rubber-insulating gloves are safe and reliable for workers dealing with electrical hazards.
written by: Michael Dresser
National Sales for OEL Worldwide Industries
About OEL Worldwide Industries: OEL Worldwide Industries is a leading provider of industrial safety apparel, renowned for its dedication to innovation, quality, and customer satisfaction. With a diverse range of products and a global presence, OEL continues to set new standards in workplace safety.
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