Marking Panelboards

Status
Not open for further replies.
Little Bill

Little Bill

Moderator
Staff member
Location
Tennessee NEC:2017
Occupation
Semi-Retired Electrician
I'm not on the 2011, but noticed that 408.4(A) says that in all but one & two family dwellings, a panelboard is required to be marked as to where it's source of supply is. My question is, are industrial plants, commercial buildings, etc. required to mark what already exists? I know most code changes don't require changing already installed systems, but there would be little to no cost involved here. I know from experience that you could have dozens of MLO sub panels in a plant and not no where it is fed from. This is for sure one change I agree with. But is this change also "grandfathered" from updating?
 
Last edited:
Little Bill said:
I'm not on the 2011, but noticed that 408.4(A) says that in all but one & two family dwellings, a panelboard is required to be marked as to where it's source of supply is. My question is, are industrial plants, commercial buildings, etc. required to mark what already exists? I know most code changes don't require changing already installed systems, but there would be little to no cost involved here. I know from experience that you could have dozens of MLO sub panels in a plant and not no where it is fed from. This is for sure one change I agree with. But is this change also "grandfathered" from updating?
Click to expand...


. ................
 
chris kennedy said:
Engraved plastic plaques for this purpose can run up to $10 each. How many PNL's are there?;)
Click to expand...

I said "little to no cost". I believe there were around 15. That would be a one time cost and could easily save lots more than that if you had to turn panels off and shut production down to try and find the source. I don't know what all would be an acceptable method of marking them, but even if there were none cheaper than $10.00 that would be worth it.
I still haven't heard anyone say if existing panels have to be brought up to code.
 
Little Bill said:
I said "little to no cost". I believe there were around 15. That would be a one time cost and could easily save lots more than that if you had to turn panels off and shut production down to try and find the source. I don't know what all would be an acceptable method of marking them, but even if there were none cheaper than $10.00 that would be worth it.
I still haven't heard anyone say if existing panels have to be brought up to code.
Click to expand...

I believe existing panels are probably grandfathered.

You could easily buy blank labels and print the info on them. Stick them on the equipment.
 
jumper said:
I believe existing panels are probably grandfathered.

You could easily buy blank labels and print the info on them. Stick them on the equipment.
Click to expand...

That's what I was thinking, but I don't have a 2011 to see what is acceptable. I imagine it probably just says marked, not sure.
 
Little Bill said:
That's what I was thinking, but I don't have a 2011 to see what is acceptable. I imagine it probably just says marked, not sure.
Click to expand...

(B) Source of Supply. All switchboards and panelboards
supplied by a feeder in other than one- or two-family dwellings
shall be marked to indicate the device or equipment
where the power supply originates.
 
Status
Not open for further replies.
Top