Isolated Phase service entrance conductors
Isolated Phase service entrance conductors
(OP)
We had a project where the utility required isolated phase construction for a 2500a, 480V service.
What they wanted was that the parallel 7 sets of conductors had to be run separated by each phase to the service disconnect.
I never heard of this, and had to research the NEC to verify that was even legal.
The utility rep really did not have a good answer when I questioned the purpose. (they stated this way all three phases may not be lost if one leg faults and melts the conductor).
Does anyone know why this would bw an advantage to the utility?
What they wanted was that the parallel 7 sets of conductors had to be run separated by each phase to the service disconnect.
I never heard of this, and had to research the NEC to verify that was even legal.
The utility rep really did not have a good answer when I questioned the purpose. (they stated this way all three phases may not be lost if one leg faults and melts the conductor).
Does anyone know why this would bw an advantage to the utility?
RE: Isolated Phase service entrance conductors
RE: Isolated Phase service entrance conductors
thanks for the info. I guess the utility answer was accurate after all. They also noted a limitation of 25 ft and that conduits had to be PVC so that inductive heating affects would be minimized. Special consultation had to be provided for longer runs.