If a meter installation has more than 240 volts between phases, which item ensures safe test access?

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Safe test access means having a dedicated, insulated point where you can connect test equipment without touching energized parts. When more than 240 volts sits between phases, the risk of shock and arcing is higher, so a purpose-built interface is essential.

Test blocks provide exactly that: insulated terminal points specifically designed for measurement work. They are rated for the service voltage, keep conductors covered, and offer clear, safe access for test leads, so you can attach equipment without exposing live parts.

While a circuit breaker or switching device can disconnect power, they don’t establish a safe, measurement-ready access point. A voltage tester reveals presence of voltage but doesn’t supply a safe testing interface. Hence, test blocks are the best fit for safe test access in this scenario.