Two service disconnects in a single industrial control panel?

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Peakhunter said:
Does anyone know if there is an NEC code for or against having more than one service disconnects on a single industrial control panel?
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As a general rule I don't believe so.

You still have limitations on number of services and number of disconnecting means for each service permitted to take into account. Plus the equipment would also need to be listed as suitable for use as a service disconnecting means. Not impossible to find such a thing but also not real likely I would guess. Maybe for custom designed specific application type equipment that is often stand alone type equipment on a particular site it might be more common.
 
There is a new requirement in the 2020 NEC that would prohibit that. IE no more mail lug panels with multiple back fed breakers, need to have a single main breaker. Lots of discussion on this in other posts
See 230.71.
 
tom baker said:
There is a new requirement in the 2020 NEC that would prohibit that. IE no more mail lug panels with multiple back fed breakers, need to have a single main breaker. Lots of discussion on this in other posts
See 230.71.
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"industrial control panel" that has each disconnect in separate compartments possibly could be an exception
 
Industrial applications are not my strong point, I know there are special rules for OCP in industrial locations. Just a comment, I often see a post for "industrial" or "residential" as if those locations are different, most of the time the code applies to all locations, some limited rules, such as load calcs for residential.
 
I see the issue as, is this 'service entrance' equipment subject to Article 230 or is it just 'utilization' equipment subject to other articles like 240 and 409?
 
jim dungar said:
I see the issue as, is this 'service entrance' equipment subject to Article 230 or is it just 'utilization' equipment subject to other articles like 240 and 409?
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If it is the latter then OP needs to learn proper terminology. Service disconnecting means in NEC terminology is something covered in art 230.
 
tom baker said:
Industrial applications are not my strong point, I know there are special rules for OCP in industrial locations. Just a comment, I often see a post for "industrial" or "residential" as if those locations are different, most of the time the code applies to all locations, some limited rules, such as load calcs for residential.
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Many industrial applications are supposed to follow the general rules. There are exceptions or relaxation of the general rules typically where there is a qualified staff normally at the premises that maintain the equipment - as in they have maintenance electricians that are well trained and mostly do only electrical work and not a general maintenance department that also happens to know some things about electrical. Larger the facility often means the more likely there might be such trained staff. Use of medium voltage for distribution or even directly to some loads also tends to increase that possibility there is trained staff.
 
Thank you for the replies! What I'm looking for are the regulations pertaining to door interlocks (disconnects) when both 480 and 120 are brought into a single industrial control panel. Please see picture attached. One panel - two mechanical disconnects, one for 480 and one for 120 service.
 

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Now that we know this is for a non-service application please refer to the new discussion thread.

Can there be two mechanical disconnects on a single industrial control panel

Looking for regulations pertaining to whether it is acceptable to have two mechanical disconnects on a single industrial control panel (ICP). Specifically, when both 480 and 120 VAC are being provided to a single ICP. See image attached.
forums.mikeholt.com
 
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