Bootleg ground: Difference between revisions
extended history of bootleg grounding, added West Germany as an example |
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In [[building wiring]], a '''bootleg ground''' is an electrical [[Ground (electricity)|ground]] that is wired from the neutral side of a [[AC power plugs and sockets|receptacle]] or light fixture in an older 2-wire home.<ref>Steven Bliss ''Troubleshooting Guide to Residential Construction ''Craftsman Book Company, 1997 {{ISBN|1-928580-23-8}}, page 287</ref> This essentially connects the neutral side of the receptacle to the casing of an appliance or lamp. It can be a hazard because the neutral wire is a current-carrying conductor, which means the casing can become energized. In addition, a fault condition to a bootleg ground will not trip a [[Residual-current device|GFCI]] breaker or a receptacle that is wired from the load side of a GFCI receptacle. Bootleg grounding is |
In [[building wiring]], a '''bootleg ground''' is an electrical [[Ground (electricity)|ground]] that is wired from the neutral side of a [[AC power plugs and sockets|receptacle]] or light fixture in an older 2-wire home.<ref>Steven Bliss ''Troubleshooting Guide to Residential Construction ''Craftsman Book Company, 1997 {{ISBN|1-928580-23-8}}, page 287</ref> This essentially connects the neutral side of the receptacle to the casing of an appliance or lamp. It can be a hazard because the neutral wire is a current-carrying conductor, which means the casing can become energized. In addition, a fault condition to a bootleg ground will not trip a [[Residual-current device|GFCI]] breaker or a receptacle that is wired from the load side of a GFCI receptacle. Bootleg grounding is now against [[Electrical code|code]] in many places, but was once common in some places. For example, West Germany banned bootleg grounding in 1973, although it was common practice before and can still be found in older installations. A safer alternative [NEC Sec. 406.4(D)(2)(b)] if a grounding connection is not practicable (where a local electrical code allows it) is to install a [[Residual-current device|GFCI]] and leave the grounding terminal screw unconnected, then place a label that says "No Equipment Ground" on the GFCI and a marking that states “GFCI Protected” and “No Equipment Ground” on all downstream receptacles. |
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==120/240 volt circuits== |
==120/240 volt circuits== |
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Revision as of 00:27, 18 May 2018
 | This article needs attention from an expert on the subject. The specific problem is: Is there any difference between this and TN-C? The article does not make it clear for European readers. (January 2015) |
In building wiring, a bootleg ground is an electrical ground that is wired from the neutral side of a receptacle or light fixture in an older 2-wire home.[1] This essentially connects the neutral side of the receptacle to the casing of an appliance or lamp. It can be a hazard because the neutral wire is a current-carrying conductor, which means the casing can become energized. In addition, a fault condition to a bootleg ground will not trip a GFCI breaker or a receptacle that is wired from the load side of a GFCI receptacle. Bootleg grounding is now against code in many places, but was once common in some places. For example, West Germany banned bootleg grounding in 1973, although it was common practice before and can still be found in older installations. A safer alternative [NEC Sec. 406.4(D)(2)(b)] if a grounding connection is not practicable (where a local electrical code allows it) is to install a GFCI and leave the grounding terminal screw unconnected, then place a label that says "No Equipment Ground" on the GFCI and a marking that states “GFCI Protected” and “No Equipment Ground” on all downstream receptacles.
120/240 volt circuits
Before 1996, in the United States it was common to ground the frames of 120/240-volt appliances (such as a clothes dryer or oven) to neutral (grounded) conductors. This has been prohibited in new installations since the 1996 National Electrical Code upon local adoption by legislation or regulation. Existing installations are permitted to continue in accordance with NEC 250.140 Exception.
References
- ^ Steven Bliss Troubleshooting Guide to Residential Construction Craftsman Book Company, 1997 ISBN 1-928580-23-8, page 287
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