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#36827 - 04/15/04 08:04 PM grounding metal boxes,per 250.148
mj Offline
Member

Registered: 06/10/02
Posts: 188
Loc: meriidian, ms
I have a set of plans that require an equipment grounding conductor to be connected to all metal boxes. How many of you guys pigtail to each metal box in a system? is it not true that the metal to metal conduit connection should be enough ?

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#36828 - 04/15/04 08:21 PM Re: grounding metal boxes,per 250.148
Joey D Offline
Member

Registered: 10/10/03
Posts: 263
Loc: Arlington MA U.S.
I ground every box. Yes the pipe would cover you code wise but the conductor is a back up.

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#36829 - 04/15/04 08:49 PM Re: grounding metal boxes,per 250.148
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
I almost always install an equipment ground wire in metal raceways. By the way your worded your question I'm not sure if you asking about installing the wire or connecting the wire to the boxes if it is installed. 250.148 requires the equipment ground wire to be connected to any metal boxes that the circuit conductors are spliced in.
_________________________
Curt Swartz

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#36830 - 04/15/04 08:50 PM Re: grounding metal boxes,per 250.148
Jps1006 Offline
Member

Registered: 01/22/04
Posts: 609
Loc: Northern IL
You need a pigtail when the receptacle is not self-grounding. I have yet to see a GFI that is. A self-grounding receptacle has a clip or spring that tightens the connection between the yoke and the screw.

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#36831 - 04/16/04 06:17 AM Re: grounding metal boxes,per 250.148
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
I check for it during inspection. I ask for all the boxes to be bonded.
_________________________
Ryan Jackson,
Salt Lake City

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#36832 - 04/16/04 08:36 AM Re: grounding metal boxes,per 250.148
caselec Offline
Member

Registered: 04/14/02
Posts: 557
Loc: San Jose, CA
OOPS……..Last night when I posted I was just clicking on the updated topics but didn’t read the title. This morning I see that the title of this post is about 250.148. Back to first grade reading class for me.

Curt


[This message has been edited by caselec (edited 04-16-2004).]
_________________________
Curt Swartz

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#36833 - 04/16/04 12:39 PM Re: grounding metal boxes,per 250.148
DougW Offline
Member

Registered: 06/08/03
Posts: 1083
Loc: North Chicago, IL
Almost fell for this (lazy bone) - had a metal j-box inbetween 2 runs of NM. It was out of the way, almost just tied the 2 grounding wires together withou attaching to the box.

But then I thought...[size4]WWJTD?[/size]
What Would Joe Tedesco Do?

I pigtailed.

[This message has been edited by DougW (edited 04-16-2004).]

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#36834 - 04/16/04 01:05 PM Re: grounding metal boxes,per 250.148
frenchelectrican Offline

Member

Registered: 02/06/03
Posts: 938
Loc: Wi/ Paris France { France for ...
i will ground every metal box both pigtailed and run the grounding conductor as back up in case the conduct get loosen up [ which i see it happend from time to time].

before i get way off the point here let you know the 4X4X21/8 box i use is Raco #244 .,,, if some of you are famiur with it i will say that work the best for surface mounted area escpally the cement wall types [ it have raised ground screw in one corner of box ] .,,,

sorry for change the subject for a min


merci, marc
_________________________
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


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#36835 - 04/17/04 04:12 AM Re: grounding metal boxes,per 250.148
rizer Offline
Member

Registered: 01/03/04
Posts: 90
Loc: bradenton ,fl.,usa
code is code but you stated that the prints calledfor a separate ground wire. anytime i see the print or a spec for a job which calls for the installation to go beyond what the code requires thats what i install.

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#36836 - 04/17/04 07:30 AM Re: grounding metal boxes,per 250.148
DougW Offline
Member

Registered: 06/08/03
Posts: 1083
Loc: North Chicago, IL
Frenchelectrician's post got me thinking...

Is it just me, or are almost all of the 1900's/4"x4" J boxes now are the "cement wall" type, with the raised area for a grounding screw?

I haven't seen a flat backed one in a while now.

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