How to Test Electrical Gloves? | 5-Step OSHA Process

An electrical glove that fails during use can turn a routine job into a life-threatening event, and knowing how to test electrical gloves correctly is the only defense. The five-step sequence covers cleaning, visual inspection, air testing, and high-voltage dielectric verification—all required by OSHA on a strict schedule. Here’s exactly what the process looks like, from the shop sink to the certification stamp.

Testing Electrical Gloves: The 5-Step Sequence That Meets OSHA Standards

The testing protocol for rubber insulating gloves follows a fixed order, and each step catches a different kind of defect. Cleaning removes contaminants that can hide damage. Visual inspection finds cuts, punctures, ozone checking, and chemical deterioration. The air test reveals slow leaks and hidden pinholes. Dielectric testing applies high voltage to confirm the glove can withstand its rated voltage. Finally, passing gloves are dried, stamped with the test date, and returned to service with full traceability.

How Often Should Electrical Gloves Be Tested?

OSHA 29 CFR 1910.137 and NFPA 70E set clear intervals. Gloves in active use must be tested every 6 months after first issue. The clock starts when the gloves are removed from the original packaging—not when they’re handed to a worker. Gloves stored for more than 12 months without testing must be tested before first issue. And even unissued gloves sitting on a shelf expire 6 months after their last test date.

Step 1: Cleaning and Visual Inspection

Before any electrical test, gloves must be meticulously cleaned. Dirt, grease, and foreign objects can hide damage or cause false readings during dielectric testing. Wash the gloves with mild soap and water, then dry them completely.

Once clean, inflate the glove slightly and roll it from the cuff toward the fingers. The rolling action stretches the rubber and reveals holes, cuts, ozone cracking, UV checking, swelling, or chemical deterioration. Sleeves cannot be inflated, so roll them along the edge to expose cuts and tears. Any visible damage means the glove fails the inspection step and cannot be used.

Step 2: The Air (Inflation) Test

The air test checks for slow leaks that a visual inspection can miss. Trap air inside the glove by rolling the cuff or using a powered inflator. Listen for escaping air, or hold the glove against your cheek to feel the leak. Dipping the inflated glove in soapy water makes bubbles appear at any leak point.

Repeat the test with the glove turned inside out. ASTM F496-20 sets expansion limits: Type I gloves should not exceed 1.5 times their normal size, and Type II gloves should not exceed 1.25 times. Over-inflation can damage the rubber. If any hole, tear, cut, or swelling exists, the glove cannot be used per 29 CFR 1910.137(c)(2)(iii).

What Happens During Dielectric Testing?

Dielectric testing is the high-voltage verification that confirms the glove can withstand its rated voltage without breakdown. The glove is submerged in water right side out, with the inside filled with tap water. The outside water is energized with high voltage while the inside water is grounded. Electrical current levels are monitored to detect leakage.

The voltage is applied for 3 minutes for both new gloves and retests. If the current passes beyond safe limits, the test stops, and the glove is stamped as a failure and removed from service.

Certification, Stamping, and Recordkeeping

Gloves that pass all steps are dried and stamped with special ink that won’t fade or wipe off. The stamp shows the test date and identifies the testing facility or qualified person. A sticker or additional stamp provides traceability back to the test record.

OSHA requires employers to keep detailed test records including the glove class, test date, and next due date. Many facilities use an alternating glove color program—different colors for the first 6-month period versus the second—to make it easy to spot which gloves are due for testing.

If a glove fails the dielectric test or is used without leather protectors, it must be retested immediately before returning to service. Any glove that shows swelling (often from petroleum products) indicates chemical damage and must be removed from service.

Any glove that fails is stamped as a failure and removed from service. If you’re replacing a pair, the best-rated electrical gloves available break down the options by class and insulation type.

Common Testing Mistakes That Compromise Safety

The five mistakes above account for most compliance failures and safety incidents involving electrical gloves. The shelf-life rule is the one that catches most programs off guard—unissued gloves sitting in storage for over 12 months are not safe to use without retesting. And the daily air test is the only way to catch damage that happened during the last shift, which makes it the most important 30 seconds of the day.

Building a Testing Program That Passes Inspection

A complete electrical glove testing program is a cycle, not a one-time event. Clean and inspect before every use. Air test each pair daily. Ship gloves out for dielectric testing every 6 months on a rotating schedule. Keep records that tie every stamp back to a test report. The gloves that pass go back into rotation; the ones that fail are destroyed. Follow that loop without shortcuts, and the person wearing those gloves stays safe.