LOTO Thru the door disconnect

[Dan Kissel]

We have many panels with thru the door disconnects. The LOTO goes on the mechanism attached to the panel door but once you open the door you have essentially removed your LOTO from the OCPD. This is the way the panels are designed and meant to be used.

Hos is LOTO applied in this situation?

 

[petersonra]

If you open the CB and put a lock on the handle you can't open the door.

You also cannot use the main CB as a LO device for working inside the panel.

I don't see an issue.

 

[Besoeker]

We have many panels with thru the door disconnects. The LOTO goes on the mechanism attached to the panel door but once you open the door you have essentially removed your LOTO from the OCPD. This is the way the panels are designed and meant to be used.

Hos is LOTO applied in this situation?



View attachment 17761

Pretty much what we did as standard on all our panels.

 

[Jraef]

For machine control panels, NFPA 79 addresses this, requiring another interior LO/TO mechanism on the switching device. Most mfrs offer them as an option, usually referred to as an "NFPA79 handle".

 

[Besoeker]

For machine control panels, NFPA 79 addresses this, requiring another interior LO/TO mechanism on the switching device. Most mfrs offer them as an option, usually referred to as an "NFPA79 handle".

Looks like an ABB product. That's mostly what we used. There was also an attachment used, I don't know what it was called, but it hooked through the operating handle mechanism and allowed multiple padlocks to be attached.

 

[Jraef]

Looks like an ABB product. That's mostly what we used. There was also an attachment used, I don't know what it was called, but it hooked through the operating handle mechanism and allowed multiple padlocks to be attached.

Yes, that one in the photo is ABB, but just about everyone selling rotary thru-door disconnects in the US has some form or another available, they have to if they are serious about our market (some low-ball Chinese suppliers don't bother).

The multi-padlock attachments are available through multiple sources as well, either the switch mfrs or lock mfrs or enclosure mfrs, even LO/TO tag mfrs like Brady.


I should add, if you use a Flange Mounted Disconnect arrangement, this is a non-issue because the operating handle remains in control of the disconnect device at all times regardless of whether the door is open or closed.

 

[Steeler5]

We have many panels with thru the door disconnects. The LOTO goes on the mechanism attached to the panel door but once you open the door you have essentially removed your LOTO from the OCPD. This is the way the panels are designed and meant to be used.

Hos is LOTO applied in this situation?



View attachment 17761

Is it not possible to lock out the circuit breaker protecting the conductors that feed said cabinet?


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