Flex Armored (“MC”) cable or Conduit for power upgrade

Location
PA
Occupation
Intern in Highschool
The current service setup is (2) 200 AMP/208V/3P (two tenant spaces each), but now there’s a need to upgrade the service from the electrical room to the tenant spaces to 400 AMP/208V/3P.

The township electrical inspector and building engineers have approved the drawings.

However, the electrician installed MC cable for the 400 AMP upgraded service in the electrical room rather than the conduit specified in the approved drawings.

The existing electrical room setup only includes galvanized hard conduit.

Is it acceptable to use MC cable for the 400 AMP service, or should it strictly follow the approved drawings showing 2 sets of (4#3/0 + 1#1/0 G in 4" conduit)?

What are the advantages and disadvantages of using MC cable compared to conduit in this scenario?
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
MC cable is perfectly acceptable according to the NEC. The one thing that needs to be checked when paralleling cables is that the EGC is large enough.
 
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