Proper Grounding of On-Site Electrical Power Systems

For optimum personnel safety, equipment protection, and power continuity to electrical loads, proper on-site power system grounding is essential. If the on-site power is the sole source of power, then its grounding is relatively straightforward and follows the National Electrical Code (NEC) Article 250. However, if the on-site power system serves an alternate source of power (i.e., emergency or standby power), then the grounding becomes more complex. Furthermore, portable and mobile generators have special grounding requirements.