A transformer-supplied system at less than 50V must be grounded if the supply voltage exceeds what level?

For a transformer-supplied system operating at less than 50V to require grounding, it is essential to consider the supply voltage exceeding 150V to ground. This requirement is based on safety and performance standards in electrical systems, such as those outlined in the National Electrical Code (NEC).

Grounding is crucial for systems that might experience higher voltages, providing an effective path for fault currents and helping to ensure that safe operating conditions are maintained. When the supply voltage is at or below 150V to ground, the system may be considered less hazardous in terms of electric shock risk. Thus, the grounding requirement comes into play once the supply voltage exceeds this threshold, safeguarding equipment and personnel from potential electrical hazards.

Understanding this voltage level establishes a clear guideline for grounding practices, emphasizing the importance of adhering to safety standards in electrical installations.