This article was posted 09/15/2006 and is most likely outdated.

Grounding versus Bonding: 250.148 Continuity and Attachment of Equipment Grounding (Bonding) Conductors to Boxes
 

 
Topic - Grounding versus Bonding: 250.148 Continuity and Attachment of Equipment Grounding (Bonding) Conductors to Boxes.

September 15, 2006  

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250.148 Continuity and Attachment of Equipment Grounding (Bonding) Conductors to Boxes.

Equipment grounding (bonding) conductors associated with circuit conductors that are spliced or terminated on equipment within a metal outlet box, must be spliced together or joined to the box with devices suitable for the purpose. Figure 250–193

Exception: The equipment grounding (bonding) conductor for isolated ground receptacles [250.146(D)] isn’t required to terminate to the metal outlet box.

(A) Splicing. Equipment grounding (bonding) conductors must be spliced with a listed splicing device that is identified for the purpose [110.14(B)]. Figure 250–194

Author’s Comment: Wire connectors of any color can be used with equipment grounding (bonding) conductor splices, but green wire connectors can only be used with equipment grounding (bonding) conductors.
(B) Grounding (Bonding) Continuity. Equipment grounding (bonding) connections must be made so that the disconnection or the removal of a receptacle, luminaire, or other device will not interrupt the effective ground-fault current path. Figure 250–195

(C) Metal Boxes. Where equipment grounding (bonding) conductors enter a metal box, they must be bonded to the box by a screw or device (i.e. ground clip) that is not used for any other purpose. Figure 250–196

Author’s Comment: Equipment grounding (bonding) conductors aren’t permitted to terminate to a cable clamp or screw that secures the plaster (mud) ring to the box. Figure 250–197



Figure 250–193
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Figure 250–194
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Figure 250–195
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Figure 250–196
(Click on image to enlarge)


Figure 250–197
(Click on image to enlarge)

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Comments
  • I was working on a house last month where the previous homeowner had bent the equipment ground back over the cable sheath just like we used to do with the bonding strip of BX cable. I was not surprised because LICENSED electricians are still doing things that were outlawed 30 years ago and there are some LICENSED electrical inspectors who are still passing this stuff.

    The most common violation that I see around the Cleveland, Ohio area is that the service weatherhead is below the point of attachment and the splices are above the weatherhead. This is a problem because stranded insulated conductor is a poor excuse for a water hose. Compact stranded conductor is an even poorer excuse. Water inside of a conductor corrodes the wire from within and this damage is not detectable. Also, water that is inside of a conductor can freeze causing damage. Since a lot of building wire has a 105 degree Celsius second rating such as AWM water that is inside the conductor can boil when the sun is beating on it.

    The second biggest violation is an around the gutter mast that looks like a cow miscarriage. This is partly because of peasants who think that a through the roof mast will leak water. ( For that matter, when adding circuits to grandmother's house she would not let me drill holes in the ceiling joists in the basement because she though that holes in the middle of the beam would weaken and she was a far cry from a civil engineer. ) There is also a house on my street with a hip roof that has ZERO overhang. So, the only legal way to put in a new service is to go underground.

    Mike Cole mc5w at earthlink dot net

    Michael R.Cole

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