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#16640 - 11/14/02 06:58 AM Help on labeling of disconnects
patti ann Offline
Junior Member

Registered: 11/14/02
Posts: 1
I'm a consultant who specializes in industrial hygiene issues; no expert in electrical safety at all.

I have a client who has a LO/TO program which is in woeful shape. I'm giving them some advice about getting up to speed, and one of the issues that I raised was the lack of labeling (with regard to purpose) they have on their electrical disconnects. Talked to them about it.

Someone raised the issue that this requirement [29 CFR 1910.303 (f)] doesn't apply to circuit breakers. I disagree, at least from a safety perspective.

Thoughts? Opinions?

Appreciate the advice greatly.

--Patti Ann

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#16641 - 11/14/02 02:43 PM Re: Help on labeling of disconnects
Tom Offline

Registered: 01/01/01
Posts: 1069
Loc: Shinnston, WV USA
"Disconnecting means- A device or group of devices or other means by which the conductors of a circuit can be disconnected from their source of supply." Sounds just like what a circuit breaker can do.

"110.22 Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident."

If I inspect a service & the branch circuits are connected (new construction only) and the panel schedule isn't filled out, you get a red sticker & get to write me another check when I come back.


[This message has been edited by Tom (edited 11-14-2002).]
Few things are harder to put up with than the annoyance of a good example.

#16642 - 11/14/02 02:58 PM Re: Help on labeling of disconnects
nesparky Offline

Registered: 06/21/01
Posts: 650
Loc: omaha,ne
The circuit directory in the panel is to show what circuit breaker controls which circuit and some what the circuit's location or area. It may not be enough for LOTO. Any thing that requires LOTO should have a disconnecting means in sight of it. There are exceptions. The circuit directory is only a place to start for LOTO. Some times turning off a breaker and locking it out will not be possible because of other loads on that circuit.
Please advise your client to have a licensed electrician help him set up the electrical portion of his LOTO program.

#16643 - 11/15/02 01:06 PM Re: Help on labeling of disconnects

Registered: 09/04/01
Posts: 142
Loc: Cincinnati, OH, USA

You are 100% correct in your take on the topic. if the breakers are being utilized at isolation devices in their LOTO program then they must be labeled to aid in assuring the correct breaker is used.

Bryan Haywood

P.S. There are some good accident photos resulting from improper or non-existent LOTO at my site. They are GRAPHIC, but they demonstrate what can and will most likely happen if LOTO is not done DEFECT FREE 100% of the time.


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