I agree and often the wet location enclosure is hardly distinguishable from the enclosure of a dry location transformer.
That fits the bill for the transformer shields the manufacturer provided to make NEMA 1 a NEMA3R
It's like what you said, there is a little extension to the louvers at the top of the transformer kind of like a rain fly on a tent. You don't want to totally enclose your transformer like you mentioned in your OP, that wouldn't allow enough air flow. A full blown thunderstorm or spray down with a garden hose isn't going to hurt that transformer.
Somewhere on the enclosure it should say NEMA 3R
You know that a dry type transformer just means that the coils are not immersed in oil, right? Just checking...
Yes, but was my understanding through another company that most dry types are typically rated for indoor use unless specifically weather guarded. Or at least the common isolation units we have around. That is probably not all that accurate, but I think the indoor units are always selected based on price. We have some others that have a specific sheltered roof over them, which I don't think, after this thread, is due to any code matter, but rather just providing additional protection.
Rodents can get into many of them even if indoors, though many installations have pest control services or other reasons that the rodent possibility is much lesser than if outdoors.
Yes. I couldn't even begin to guess how many thousands (maybe millions?) of dry-type transformers are installed outdoors in the US alone.
Most your dry types are also LV on both sides like 480 primary and 208 secondary being one the most common. If MV is involved on at least one side they likely are liquid filled.
You can get dry type transformers in NEMA 3R enclosures, i.e., suitable for outdoor installation.
Agree MV is usually pad mount liquid filled style, but dry types are available too:
www.olsun.com
Agree. Been there and done that.
