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tape shield as neutral

tape shield as neutral

tape shield as neutral

(OP)
I found an installation where a single phase 2400 L-N transformer was connected up using concentric neutral cable and the concentric  portion connected to the neutral of the transformer. However, the cable was then spliced at a subsequent manhole to a single phase cable with a tape shield with the concentric neutral spliced to the shield.  I realize that the shield  can withstand some circulating current if grounded at both ends but I am concerned that it will exceed typical circulating levels. Measured aperage was about 80 amps. Does this violate a NEC code?

RE: tape shield as neutral

Probably a violation.  The tape shield is not rated as a current-carrying conductor, as far as I am aware.   

David Castor
www.cvoes.com

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