Steel Channal Support at bases

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sam34

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The spec call out for to anchor each switchboard assembly to two 4"- channel iron sills. My question is what is really the benefit of doing this support method over the typical reinforced concrete housekeeping base? Thanks in advance.
 
Re: Steel Channal Support at bases

sam34 said:
The spec call out for to anchor each switchboard assembly to two 4"- channel iron sills. My question is what is really the benefit of doing this support method over the typical reinforced concrete housekeeping base? Thanks in advance.
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You don't have to pour concrete.

I prefer to see a four inch high concrete pad, but that is from a fear of water getting into the bottom of MCCs, since I spent many years working with water treatment equipment.
 
On a recent project the Foreman asked for a concrete slab to be installed for the switchgear. Housekeeping slab was basically as he had put it. It was the first time I had heard of it asked for.

It sure did save sometime installing the switchgear. Pipe on a paletjack, the switch gear just rolled into place.

I have heard of issues with mounting on conbustible material. I am also interested on any feedback regarding the Iron channel sills.
 
A few years ago we installed some large switchgear with a similar spec. The reason being, a previous contractor had installed some switchgear on a concrete pad which was uneven and not level. When it came time for the maintenance guys to rack the breakers in and out of the switchgear the breakers would bind on the rails. When it came time to add some new switchgear the engineer specified 4" steel channel that was leveled with a laser. Now, with the switchgear sitting perfectly level and plumb the breaker problem didn't exist.
 
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