Water Lines above Transformer

[Machiavelli999]

I have a large transformer (1,000KVA) inside a building and currently in the design we have water lines going over this transformer. It seems that the only restrictions to this in the NEC Article 110.26 apply only to panelboards and switchboards. Nevertheless, is it common to provide a drip tray above the transformer to avoid possible damage in the future from the water lines? What do you guys think?

 

[Gregg Harris]

I have a large transformer (1,000KVA) inside a building and currently in the design we have water lines going over this transformer. It seems that the only restrictions to this in the NEC Article 110.26 apply only to panelboards and switchboards. Nevertheless, is it common to provide a drip tray above the transformer to avoid possible damage in the future from the water lines? What do you guys think?

Take a look at 110.26 (F)(1)(a) and exception (b) if it is in a vault look at 450.47

 

[Machiavelli999]

Greg, thanks for the reply. It still seems that that section only applies to Panelboards and Switchboards. It seems to exclude transformers from the requirement. A transformer does not have a required electrical clearance, so it would make sense that it doesn't have a dedicated electrical space.

 

[jeremysterling]

In Texas, dry-type transformers are routinely installed outdoors and on roof tops. The manufacturers supply rain-shields for this type of install. Where I live, snow will not accumulate and drift up into transformers from below. Still looks weird, though.


If you can, install the rain-shields. If you really have to have peace of mind, you can install the drip pan.