A severe shock scenario

June 1, 2001
This situation violates Section 410-58(d). Grounding type attachment plugs and mating cord connectors and receptacles must be designed so that the grounding connection is made before the current-carrying connections. The pin in the plug was removed, which is a typical scenario on many construction sites. There are many reports of lives lost because of this situation, and this condition also brings

This situation violates Section 410-58(d). Grounding type attachment plugs and mating cord connectors and receptacles must be designed so that the grounding connection is made before the current-carrying connections. The pin in the plug was removed, which is a typical scenario on many construction sites. There are many reports of lives lost because of this situation, and this condition also brings a heavy fine by enforcing authorities. Also, understand that grounding-type attachment plugs should be used only with a cord having an equipment grounding conductor. See Section 410-58(e).

Section 250-114 requires that exposed noncurrent-carrying metal parts of cord and plug connected equipment likely to become energized must be grounded, unless they are protected by a system of “double insulation” or its equivalent. Double-insulated equipment shall be distinctively marked. Double insulation protects the user against electric shock by creating a non-conducting barrier between the operator and the electric components inside the tool.

About the Author

Joseph A. Tedesco

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Electrical Conduit Comparison Chart

CHAMPION FIBERGLASS electrical conduit is a lightweight, durable option that provides lasting savings when compared to other materials. Compare electrical conduit types including...

Fiberglass Electrical Conduit Chemical Resistance Chart

This information is provided solely as a guide since it is impossible to anticipate all individual site conditions. For specific applications which are not covered in this guide...

Considerations for Direct Burial Conduit

Installation type plays a key role in the type of conduit selected for electrical systems in industrial construction projects. Above ground, below ground, direct buried, encased...

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.