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Figure 1. Board selection starts with the circuit schedule, device space, and planned reserve. A request for a “12 way distribution board” can sound specific, but it leaves the layout unresolved. One project may use mostly single-pole devices; another may need multi-pole devices, an incomer, surge protection, metering, or more terminal space. The same number […]

A report of “leakage,” a “ground fault,” or a “short” is not yet a diagnosis. Each term points to a current path, and each path may call for a different protection function. Earth leakage means current has left the intended live and neutral paths; it may be normal in electronic equipment or may indicate deteriorated […]