Marking Panelboards

[Little Bill]

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?

 

[jusme123]

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?

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[Little Bill]

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We're supposed to mark them with dots?:happyno:

 

[chris kennedy]

but there would be little to no cost involved here.

Engraved plastic plaques for this purpose can run up to $10 each. How many PNL's are there?

 

[Little Bill]

Engraved plastic plaques for this purpose can run up to $10 each. How many PNL's are there?

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.

 

[jumper]

Engraved plastic plaques for this purpose can run up to $10 each. How many PNL's are there?

Sharpies are cheap.

 

[jumper]

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.

I believe existing panels are probably grandfathered.

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

 

[Little Bill]

I believe existing panels are probably grandfathered.

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

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.

 

[jumper]

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.

(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.