Grounding lighting circuits

The grounding of electrical circuits supplied from the low voltage side of transformers is recommended as a safety precaution by Dr. M. G. Lloyd, Chief of the Safety Section of the Bureau of Standards. In a paper presented at the meeting of the International Association of Municipal Electricians, Dr. Lloyd pointed out that grounding reduces the danger of fire and accident by preventing the occurrence on the circuit of voltages higher than expected, such as might result from lightning or from crosses with a high-voltage line. Secondary circuits carrying less than 150 volts should always be grounded, he states, and grounding is desirable also for circuits as high as 440 volts.