by Rocket Web | Dec 1, 2025 | Resistance Testing
The Test Looks Simple, but the Context Is Not An insulation resistance test applies a dc voltage between conductors or between a conductor and ground, then measures the very small leakage current. The result is expressed as resistance, commonly in megohms or gigohms....
by Rocket Web | Nov 9, 2025 | Cable Testing
What Partial Discharge Means in a Cable System Partial discharge is localized electrical activity within or around insulation that does not completely bridge the conductors. In installed cable systems, activity may be associated with insulation defects, joints,...
by Rocket Web | Nov 9, 2025 | Cable Testing
Start With the Question, Not the Test Set Medium-voltage cable testing can be a withstand test, a diagnostic test, or a combination of both. The right method depends on whether the cable is new or service-aged, shielded or unshielded, extruded or laminated, recently...
by Rocket Web | Oct 15, 2025 | Switchgear Testing
Why Switchboards Become a Single Point of Concern A main switchboard may serve most of a commercial building’s load. Problems at the service entrance, main bus, feeder breakers, metering, or ground-fault protection can affect tenants, life-safety systems,...
by Rocket Web | Oct 15, 2025 | Relay Testing
A Relay Can Pass While the Scheme Still Fails Protective relays make decisions from current, voltage, timing, logic, and communications. A bench or secondary-injection test can show that a relay element responds correctly, but that result alone does not prove the...
