Concrete Encasement Of Service

[ed downey]

Can someone help me clear up the following:
I am looking at a set of drawings which has a 13.2KV service located on the 4th floor of the building. The engineer is currently calling for concrete encasement of the conduits only until the conduits reach the main electrical room. After they reach the main electrical room they are then run as Rigid steel conduits to their termination point at the main switchgear.
I was under the impression that Section 230 called for these conductors to be encased in concrete until they reach their service disconnecting means. Am I incorrect?

 

[bennie]

Re: Concrete Encasement Of Service

This feeder is likely protected near its withstand rating. A fault, at the conduit, in the equipment room, will tend to burn clear, hopefully not igniting anything. Concrete encasement would tend to extend the time for clearing the fault.

The service entrance conductors are considered to be at the point closest to their entrance in the building. The entrance point is where the encasement ends.

[ April 28, 2003, 11:31 AM: Message edited by: bennie ]