In this EC&M Tech Talk, Randy Barnett covers what is arguably one of the most important Code topics when it comes to safety – bonding. The purpose of the NEC revolves around protecting people and property. Unquestionably, a lack of bonding, the improper application of Article 250 results in shock, electrocutions and fires. This EC&M Tech Talk examines National Electrical Code Article 250 Grounding and Bonding, Part V Bonding.
Applying Part V requires an understanding of what bonding must accomplish. So, the performance requirements of Sec. 250.4 are first explained. To appreciate the need to meet these requirements a few incidents are discussed noting how proper bonding would save lives and prevent fires. The rules of Part V are covered. Attention is paid to sizing of the various bonding conductors and jumpers, including sizing of the equipment grounding conductor which is addressed in Part VI. Finally, the Equipotential Plane is explained. Not a part of the grounding electrode system, this equipotential plane is of extreme importance when it comes to personnel safety. The rules and NEC references are provided.
