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MCC Section Anchoring

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J

jbox33

New member
Location
DuBois,PA
Hi all,

New to the forum and have been in industrial maintenance for 20 years now. My question is are MCC sections required to be bolted down?

I haven't been able to find this info anywhere. Where I currently work there are some A-B Centerline 2100 sections that are not anchored and they seem very unstable to me. I was wondering if there was a requirement for this. Thanks
 
Jraef

Jraef

Moderator, OTD
Staff member
Location
San Francisco Bay Area, CA, USA
Occupation
Electrical Engineer
110.13:
(A) Mounting. Electrical equipment shall be firmly secured
to the surface on which it is mounted. Wooden plugs driven
into holes in masonry, concrete, plaster, or similar materials
shall not be used.
 
kwired

kwired

Electron manager
Location
NE Nebraska
Occupation
EC
Jraef said:
110.13:
(A) Mounting. Electrical equipment shall be firmly secured
to the surface on which it is mounted. Wooden plugs driven
into holes in masonry, concrete, plaster, or similar materials
shall not be used.
Click to expand...
At what point does one consider the weight of an item to be sufficient to secure it? Especially large switchboards, MCC's, transformers, or anything similar? A motor may need secured because of mechanical forces between it and the driven load, making it different in that regard.
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
kwired said:
At what point does one consider the weight of an item to be sufficient to secure it? Especially large switchboards, MCC's, transformers, or anything similar? A motor may need secured because of mechanical forces between it and the driven load, making it different in that regard.
Click to expand...

The instructions tell us to secure it so we must do that correct?

Also I do not believe the friction caused be the weight of the object will ever meet any seismic securing requirements. The equipment's mass works against the goal of keeping it stationary relative the area it is located in.:)
 
kwired

kwired

Electron manager
Location
NE Nebraska
Occupation
EC
iwire said:
The instructions tell us to secure it so we must do that correct?

Also I do not believe the friction caused be the weight of the object will ever meet any seismic securing requirements. The equipment's mass works against the goal of keeping it stationary relative the area it is located in.:)
Click to expand...
I have no argument other then there is a lot of things out there that are not secured to floors, earth, etc. Some of them even machines, appliances, etc. that maybe are not specifically covered by NEC, yet we attach disconnecting means and wiring methods to them. They are pretty solid because of their mass and are not going to move without some extreme force that may even cause damage to them. Go to places where seismic activity is a bigger issue and there may be more codes and enforcement that address the issue though.
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
kwired said:
I have no argument other then there is a lot of things out there that are not secured to floors, earth, etc. Some of them even machines, appliances, etc. that maybe are not specifically covered by NEC,
Click to expand...

Yet the OPs question is specifically about equipment covered by the NEC.

yet we attach disconnecting means and wiring methods to them. They are pretty solid because of their mass and are not going to move without some extreme force that may even cause damage to them. Go to places where seismic activity is a bigger issue and there may be more codes and enforcement that address the issue though.
Click to expand...



I hear water is wet too. :D
 
kwired

kwired

Electron manager
Location
NE Nebraska
Occupation
EC
iwire said:
Yet the OPs question is specifically about equipment covered by the NEC.





I hear water is wet too. :D
Click to expand...
Yes OP question is specifically about MCC's which are covered by NEC. Unless instructions include details on what is suitable to fasten the MCC to the floor, just drive a couple #10 tapcons into the floor at opposite corners and you are good to go :)
 
tom baker

tom baker

First Chief Moderator & NEC Expert
Staff member
Location
Bremerton, Washington
Occupation
Master Electrician
kwired said:
Yes OP question is specifically about MCC's which are covered by NEC. Unless instructions include details on what is suitable to fasten the MCC to the floor, just drive a couple #10 tapcons into the floor at opposite corners and you are good to go :)
Click to expand...

I have installed or inspected many AB 2100 MCCs. The instructions are very specific on how to fasten, 1/2" anchors, 4 on an end, 2 on intermediate. We use Hilti HY500 which is seismic rated. Move the MCC into place, mark the holes, drill, and then move the MCC back. Inject the HY500 thru the bottom of the MCC and then insert the studs, let the adhesive cure, install washers and nuts.

Some companies install 2x2 angle iron in the housekeeping pad and fasten to that.
 
iwire

iwire

Moderator
Staff member
Location
Massachusetts
kwired said:
Yes OP question is specifically about MCC's which are covered by NEC. Unless instructions include details on what is suitable to fasten the MCC to the floor, just drive a couple #10 tapcons into the floor at opposite corners and you are good to go :)
Click to expand...

Yeah OK, great advice.:roll:

Sounds like a guy who never gets an inspection.
 
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