240.21(C)(4) Outside secondary conductors of unlimited length

[Dale001289]

Does 240.21(C )(4) still apply if the transformer is located inside the building but the secondary conductors are routed outside to the load?

 

[augie47]

The '17 Code added a bit of wording to clarify the for (C)(4) to apply the conductors must be outside the building except at the point of load termination.

 

[Dale001289]

The '17 Code added a bit of wording to clarify the for (C)(4) to apply the conductors must be outside the building except at the point of load termination.

I tend to agree with you. Essentially this means the transformer itself must be installed outdoors.

 

[augie47]

Depending on your transformer manufacturer and size, that often simply involves adding some rain shields

 

[Dale001289]

Depending on your transformer manufacturer and size, that often simply involves adding some rain shields

True. But also means down time. I'm sure this client will seek another interpretation to avoid rework.