Raised Cover Receptacles and Switches

[jap]

If a wire type EGC is run in emt conduit to a metal 4 sq box with a raised cover receptacle or switch , the EGC bonds to the box but does not have to jumper to the receptacles or switches mounted on the cover as long as the receptacle or switch is mounted with (2) screws with nuts and the cover has the indented corners that bolt flat to the box correct?

We talked about this a while back, but I cant find the thread.

Thanks,
JAP>

 

[infinity]

Yes, those surface type covers with the indented corners are already listed for grounding so no bonding jumper required.

 

[jap]

Thanks, those EGC's add up quick.

JAP>

 

[infinity]

Code reference:

250.146 Connecting Receptacle Grounding Terminal toBox. An equipment bonding jumper shall be used to con-
nect the grounding terminal of a grounding-type receptacle
to a grounded box unless grounded as in 250.146(A)
through (D). The equipment bonding jumper shall be sized
in accordance with Table 250.122 based on the rating of the
overcurrent device protecting the circuit conductors.
(A) Surface-Mounted Box. Where the box is mounted on
the surface, direct metal-to-metal contact between the de-
vice yoke and the box or a contact yoke or device that
complies with 250.146(B) shall be permitted to ground the
receptacle to the box. At least one of the insulating washers
shall be removed from receptacles that do not have a con-
tact yoke or device that complies with 250.146(B) to ensure
direct metal-to-metal contact. This provision shall not apply
to cover-mounted receptacles unless the box and cover
combination are listed as providing satisfactory ground
continuity between the box and the receptacle. A listed ex-
posed work cover shall be permitted to be the grounding
and bonding means when (1) the device is attached to the
cover with at least two fasteners that are permanent (such
as a rivet) or have a thread locking or screw or nut locking
means and (2) when the cover mounting holes are located
on a flat non-raised portion of the cover.

 

[jap]

Code reference:

That's what I came up with but my mind thinks in the opposite way most times.

I don't like it when it goes into saying "Shall not apply, Unless".

I'd understand it much quicker if it read "This also applies to ....

But that's just me.

JAP>

 

[darekelec]

Yes, those surface type covers with the indented corners are already listed for grounding so no bonding jumper required.

If the raised cover is painted can a case be made against

250.12 Clean Surfaces. Nonconductive coatings (such aspaint, lacquer, and enamel) on equipment to be grounded shall be removed from threads and other contact surfaces to ensure good electrical continuity or be connected by means of fittings designed so as to make such removal unnecessary.

?

 

[kwired]

If the raised cover is painted can a case be made against

250.12 Clean Surfaces. Nonconductive coatings (such aspaint, lacquer, and enamel) on equipment to be grounded shall be removed from threads and other contact surfaces to ensure good electrical continuity or be connected by means of fittings designed so as to make such removal unnecessary.

?

If painted before assembled, yes. If painted after assembled, surfaces already making contact should not let paint into the connection - JMO.

 

[Smart $]

That's what I came up with but my mind thinks in the opposite way most times.

I don't like it when it goes into saying "Shall not apply, Unless".

I'd understand it much quicker if it read "This also applies to ....

But that's just me.

JAP>

The general text of 250.146 says a bonding jumper is required. 250.146(A) says a bonding jumper is not required where the yoke makes a solid connection to the box. The part after that says this provision, i.e. jumper not required, shall not apply unless the box and cover combination is listed as providing satisfactory grounding. IOW if the box and cover combo is not listed as providing satisfactory grounding, a jumper is required.

You have to follow the logic in progression... :happyyes:

 

[jap]

The general text of 250.146 says a bonding jumper is required. 250.146(A) says a bonding jumper is not required where the yoke makes a solid connection to the box. The part after that says this provision, i.e. jumper not required, shall not apply unless the box and cover combination is listed as providing satisfactory grounding. IOW if the box and cover combo is not listed as providing satisfactory grounding, a jumper is required.

You have to follow the logic in progression... :happyyes:

They pretty well cover all of their bases by following that progression to the point of confusion.


JAP>

 

[infinity]

The general text of 250.146 says a bonding jumper is required. 250.146(A) says a bonding jumper is not required where the yoke makes a solid connection to the box. The part after that says this provision, i.e. jumper not required, shall not apply unless the box and cover combination is listed as providing satisfactory grounding. IOW if the box and cover combo is not listed as providing satisfactory grounding, a jumper is required.

You have to follow the logic in progression... :happyyes:

I think that we're discussing a box where the device is connected to the cover not the box.

 

[jap]

Some have said the jumper is needed because the cover with the device in it is removeable.
Others have said you should shut the power off prior to removing the cover so it is not needed.

I'm just looking for a yes or no as to whether the jumper to the box from the device is required or not when mounted on a raised cover like infinity posted.


JAP>

 

[kwired]

Some have said the jumper is needed because the cover with the device in it is removeable.
Others have said you should shut the power off prior to removing the cover so it is not needed.

I'm just looking for a yes or no as to whether the jumper to the box from the device is required or not when mounted on a raised cover like infinity posted.


JAP>

Used to be required to use the jumper, can't remember which year they changed wording to like it is now which allows certain cover types to be acceptable for the bonding when assembled to the box, maybe 2008 or 2011?

 

[al hildenbrand]

I'm just looking for a yes or no as to whether the jumper to the box from the device is required or not when mounted on a raised cover like infinity posted.

No. No jumper required between the device and the box when the cover is as shown in Infinity's image. The cover itself is a component in the assembly that is the EGC. The cover is the EGC

 

[Smart $]

I think that we're discussing a box where the device is connected to the cover not the box.

The yoke makes a solid connection to the box by way of the box and cover being a listed combination providing satisfactory grounding... i.e the cover serves as the jumper.

 

[jap]

The yoke makes a solid connection to the box by way of the box and cover being a listed combination providing satisfactory grounding... i.e the cover serves as the jumper.

So there is no requirement for the jumper for when the cover is not bolted to the box or for that matter when a receptacle is removed from a metal box flush in the wall that makes metal contact to the yoke of the device when its installed correct?

JAP>

 

[don_resqcapt19]

I think that these rules are backwards. The screw connections should be permitted to bond the box and cover, but not permitted to bond the receptacle itself. It is my opinion that the connection to the receptacle it more important than the connection to the cover and box, but obviously, CMP5 does not agree with me.

 

[jap]

I think that these rules are backwards. The screw connections should be permitted to bond the box and cover, but not permitted to bond the receptacle itself. It is my opinion that the connection to the receptacle it more important than the connection to the cover and box, but obviously, CMP5 does not agree with me.

I would agree with you.

They just need to remove the part about when a wire type EGC is installed in a metal raceway that it has to be bonded to the box when a splice or device is installed in or on the box.

To me, let the metal conduit bond the raceways and the boxes and let the wire type EGC (If installed) bond the devices installed in the box.

That way the wire type EGC can be taken to the Ground Screw on the receptacle or switch in the raised cover and not have the need for extra wire, labor and material to jumper from the box to the receptacle to bond something that is already bonded in the first place by the conduit.

JAP>

 

[MAC702]

I would agree with you.

They just need to remove the part about when a wire type EGC is installed in a metal raceway that it has to be bonded to the box when a splice or device is installed in or on the box.

To me, let the metal conduit bond the raceways and the boxes and let the wire type EGC (If installed) bond the devices installed in the box.

That way the wire type EGC can be taken to the Ground Screw on the receptacle or switch in the raised cover and not have the need for extra wire, labor and material to jumper from the box to the receptacle to bond something that is already bonded in the first place by the conduit.

JAP>

I'm a manufacturer of 6" long pieces of green wire and I have lobbied heavily against you. Please don't outbid out my codewriters.

 

[jap]

I'm a manufacturer of 6" long pieces of green wire and I have lobbied heavily against you. Please don't outbid out my codewriters.

At .43 cents a piece for the pre-made ground stingers, I make my own, so I don't buy your jumpers anyway.


JAP>

 

[goldstar]

I'm trying to follow the logic here. If you are using EMT and a metal 4" sq. JB then you are not required to use a bonding jumper when you are installing a receptacle in a raised cover. I'm guessing the same logic applies if you're installing a receptacle into a recessed metal gem box. In that case, you would have to use a self-grounding receptacle in order to insure a proper ground. In either case, if you pulled the receptacle out that receptacle would no longer be grounded (but that's scenario when using IF for another thread).

Now, if you're running MC cable, the grounds have to be spliced through with a pig-tail to a grounding screw in the box. I'm guessing the same logic would apply to grounding the actual receptacle would it not ?