Secondary Xfrmr Conductors

[Alwayslearningelec]

Besides utility xfrms are all other xfrmr secondary conductors limited to 25' before terminating on a OCPD? Does it make a difference whether it's a breaker or disconnect switch regarding footage allowed.

 

[jim dungar]

Conductors on the secondary of transformers before the service point are service conductors and as such are subject to article 230.
Conductors on the secondary of transformers after the service point, are subject to 240.21(C).

It makes no difference what type of overcurrent protective device is used.

 

[augie47]

Length restrictions vary depending on circumstances and type (2 wire, delta, or mutli-phase)
It can be 10', 25' (most common), unlimited (outside) or, in supervised industrial situations, 100' or greater (240 Part VIII)