A meter installation with nominal voltage of more than 240 volts between phases must be equipped with which item?

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Test blocks provide safe, accessible testing points at the meter installation. When the voltage between phases is higher than 240 V, having dedicated test blocks lets technicians connect test equipment and perform verification of the meter without exposing live conductors or disturbing the normal connections. They offer insulated, clearly labeled terminals for applying known test signals and checking CT/VT wiring, which is essential for confirming meter accuracy under higher voltage conditions. Protective devices like circuit breakers or switching devices serve isolation and safety roles, and a voltage tester is a hands-on tool for checking presence of voltage, but the built-in feature that supports measurement verification in a high-voltage installation is the test blocks.