Service Rated Disconnects

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McCES

McCES

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I have a new industrial installation fed from a 13.8kv breaker at the utility substation. From here the 13.8kv runs overhead to a 13.8kv-480v unit substation. From the unit sub there are feeds to Motor control centers in several different buildings within the plant. The inspector is requiring service rated disconnects at each of these buildings, in front of the MCC incoming section.
My opinion is the point of service is at the 13.8kv breaker at the utility sub. The runs to the plant buildings are feeders and therefore do not require service rated disconnects.
Any opinions?
 
So 225.32 exception #1 the disconnect for remote building feeders can be located elsewhere on the premises, say in the 13.8kv-480v unit substation?
The feeder breakers in the unit sub would meet the code if they were service rated to satisfy 255.36?
 
McCES said:
So 225.32 exception #1 the disconnect for remote building feeders can be located elsewhere on the premises, say in the 13.8kv-480v unit substation?
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From the little I know of your plant I would say you may well have a shot at using exception 1 of 225.32. Not sure I want to put my name on the continual use of safe switch procedures.

The feeder breakers in the unit sub would meet the code if they were service rated to satisfy 255.36?
Click to expand...

It seems so if the gear these breakers are installed in is service rated.

Is there no option available from the MCC manufacturer for a service rated main switch section?

With the requirements of 70E becoming such an issue I would think good design would include a disconnecting means right at the MCC. :smile:
 
In 225.36 it states "...shall be suitable for use as service equipment."
Am I correctly interpreting that as meaning the same as "service-rated equipment"? I can't see that it would mean anything other than that...
 
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