450.21 & Multiple 112.5 kVA xfmrs in room

[sparkyguy545]

Restrictions in 450.21 (and all examples I can find) list various construction limitations focused on installations which exceed 112.5 kVA. What if I have 2 x 75 kVA xfmrs in the same room? Since each transformer is below the 112.5 kva limit, do the construction requirements for smaller transformers apply; or because the aggregate is 150 kVA (which is above the 112.5 kVA limit) am I required to follow requirements for the larger transformers?

 

[dana1028]

The construction limitations only apply to "individual dry-type XOs of more than 112.5 kVA."

 

[wbalsam1]

I agree.

 

[raider1]

I agree with dana1028, you don't add the ratings of the transformers together when applying 450.21.

Chris

 

[chevyx92]

Do these transformers meet the 450.21(A) Exception? If they do which is what is always seen and used which transformers(got a pic???) need to comply with 450.21(A) and the 12 inch clearences??

 

[chevyx92]

Whoops here's the pic I forgot to post in the previous post.