Many times, the only thing standing between you and a high-voltage jolt are your gloves. The importance of this protective equipment can't be understated. That's why we're offering five important electrical safety tips you should know about the gloves you use to help keep you safe and help prevent electric shocks.
1. Date Stamps
According to the Occupational Safety and Health Administration (OSHA) in 29 Code of Federal Regulations (CFR) 1910.137(c)(2)(viii) and the referenced Table I-5, all electrical gloves must be tested periodically and prior to being placed into service. All glove manufacturers incorporate some form of production code or date coding to indicate the date of initial testing. In accordance with Table I-5 rubber insulating gloves must be tested before first issue and every six months thereafter or upon indication that the insulating value is suspect; after repair; and after use without protectors. Also, if the insulating equipment has been electrically tested but not issued for service, the insulating equipment may not be placed into service unless it has been electrically tested within the previous 12 months. For additional information on in-service care of electrical gloves reference ASTM F496-14a.
These testing requirements can sometimes be a little confusing to interpret. Here's an example: You're considering using your electrical gloves for the first time on March 1, 2017, and notice the date stamp is February 27, 2016. Would you need to get the gloves retested before use? Yes, because you haven't put the gloves into service within the allowable 12 month window. But, if the date stamp read March 2, 2016, you could use them and wouldn't need to retest them until six months after you put them into service on March 1, 2017.
2. Test Labs
Gloves should be sent to an accredited laboratory for retesting. To find a laboratory in your area, you can visit the North American Independent Laboratories for Protective Equipment Testing (NAIL for PET) site: http://www.nail4pet.org.
3. Glove Classification
OSHA outlines electrical protective equipment in 29 CFR 1910.137. Electrical safety gloves are categorized by the level of voltage protection they provide and whether or not they are resistant to ozone. The voltage breakdown is as follows:
- Class 00 — Maximum use voltage of 500 volts AC/proof tested to 2,500 volts AC and 10,000 volts DC
- Class 0 — Maximum use voltage of 1,000 volts AC/proof tested to 5,000 volts AC and 20,000 volts DC
- Class 1 — Maximum use voltage of 7,500 volts AC/proof tested to 10,000 volts AC and 40,000 volts DC
- Class 2 — Maximum use voltage of 17,000 volts AC/proof tested to 20,000 volts AC and 50,000 volts DC
- Class 3 — Maximum use voltage of 26,500 volts AC/proof tested to 30,000 volts AC and 60,000 volts DC
- Class 4 — Maximum use voltage of 36,000 volts AC/proof tested to 40,000 volts AC and 70,000 volts DC
Ozone resistance is broken down into either Type I or Type II: Type I is not resistant to ozone; Type II is resistant to ozone.
Note: A leather protector should always be worn over a rubber insulating glove to provide protection from cuts, abrasions and punctures. However there are some exceptions highlighted in 29 CFR 1910.137(c)(2)(vii)(A) — (C). If the voltage does not exceed 250 volts AC, or 375 volts DC, protector gloves need not be used with Class 00 or Class 0 gloves, under limited-use conditions, when small equipment and parts manipulation necessitate unusually high finger dexterity. It also states that any other class of gloves may be used without protector gloves, under limited-use conditions, when small equipment and parts manipulation necessitate unusually high finger dexterity but only if the employer can demonstrate that the possibility of physical damage to the gloves is small and if the class of gloves is one class higher than that required for the voltage involved.
4. Glove Inspection
OSHA requires that "protective equipment be maintained in a safe, reliable condition." Gloves should be inspected for tears, holes, ozone cuts and other defects before each use. For more information, refer to the ASTM F 1236-16 standard guide for the visual inspection of electrical protective rubber products.
Also, gloves should be inspected for any swelling, which is generally caused by chemical contamination (specifically petroleum products). Even the slightest swelling can be an issue.
If the electrical gloves show any signs of the defects discussed above upon inspection, they should be taken out of service for cleaning and retesting (even if it hasn't met the six month “in-service” rule or the 12-month shelf life rule discussed in the date stamp section of this article) per ASTM D120-14a requirements.
5. Glove Air Test
29 CFR 1910.137(c)(2)(ii) requires an air test be performed along with inspections for insulating gloves. ASTM F 496 also specifies air tests for the in-service care of insulating gloves and sleeves. Basically, the glove is filled with air (either manually or with a power inflator) and then checked for leakage.
As stated in ASTM F 496, Type I gloves should be expanded no more than 1.5 times their normal size during the air test and Type II gloves no more than 1.25 times. The procedure should be repeated after turning the glove inside out.
Grainger offers electrical gloves and leather protectors to meet your hand protection needs. For more information on electrical safety gloves, please see Grainger Quick Tips #262, Electrical Safety Gloves: Inspection and Classification.
Ask a Certified Safety Professional
by Wes Maertz, CSP
Technical Safety Specialist
Certified Safety Professional
B.S.E. in Occupational Safety
19 years at Grainger
Question: Does the voltage rating on my dielectric gloves determine what category of personal protective equipment (PPE) I will need for arc flash protection?
Interpretation: There is no direct correlation between the voltage rating of the glove and the PPE category of equipment for arc flash protection. The voltage rating class of a glove is determined by the voltage of the task, and the arc flash PPE category rating is based upon estimated incident energy of the task.