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 Post subject: Depth of penetration
PostPosted: Tue May 19, 2020 9:25 am 

Joined: Tue May 19, 2020 9:23 am
Posts: 1
Trying to wrap my head around a possible issue.

How long can the screws for mounting/changing equipment in an MCC bucket be? I figured that the spacing requirements would be a NEMA standard or published by the manufacturers but this seems to be some obscure information I can't find anywhere.

Thinking of the "blind reaching" problem. There clearly has to be some kind of standard established for this but I can't find it anywhere and it may be simply that I haven't come up with the right terminology to find the answer. NEMA ICS clearly implies that there needs to be a 1" bus clearance including fasteners but I can't find anything on the fasteners themselves.

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 Post subject: Re: Depth of penetration
PostPosted: Fri Jul 24, 2020 12:43 pm 

Joined: Wed Jul 25, 2012 11:41 am
Posts: 12
Location: Halifax, NS
I'm not sure what the concern is exactly.

Do you mean modifications to the installed equipment? I would suspect that as long as the proper clearances are maintained that the length of the fastener isn't important. I would assume that shorter is better when possible.

Can you give an example where the length of the fastener would be a concern if the clearances are maintained?

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