Disconnects on secondary side of transformer?

[dwellins]

Wondering if it is legal to install (2) 40 amp Disconnects (for 2-package AC units -22 RLA 40A max OCPD) from the secondary side of a 45KVA transformer. Transformer will have primary OCPD (125%). Transformer will be located outdoors with disconnects mounted approximately 15' from transformer. Disconnects will be grouped. I will have (2) conduits & conductors (#8 AWG CU) leaving the transformer until they reach the (2) disconnects which then will supply the AC units.
This will be the only 2 items fed from the transformer


FYI this will be step-up transformer from 240 Delta to 480/277---The engineer spec'd and ordered wrong AC equipment so it is falling in our hands to resolve it. :slaphead:
Original plan was for a panelboard with a 70 A Main with 2-40 amp OCPD for equipment but they are trying to save some $$

Thanks for any input

 

[electrofelon]

Wondering if it is legal to install (2) 40 amp Disconnects (for 2-package AC units -22 RLA 40A max OCPD) from the secondary side of a 45KVA transformer. Transformer will have primary OCPD (125%). Transformer will be located outdoors with disconnects mounted approximately 15' from transformer. Disconnects will be grouped. I will have (2) conduits & conductors (#8 AWG CU) leaving the transformer until they reach the (2) disconnects which then will supply the AC units.
This will be the only 2 items fed from the transformer


FYI this will be step-up transformer from 240 Delta to 480/277---The engineer spec'd and ordered wrong AC equipment so it is falling in our hands to resolve it. :slaphead:
Original plan was for a panelboard with a 70 A Main with 2-40 amp OCPD for equipment but they are trying to save some $$

Thanks for any input

See 240.21(C) 2,4,6. What you propose appears to be compliant to me. Just to double check, this is a 240 not a 208 service? Who is paying for the screw up and the transformer losses over the life of the equipment?

 

[augie47]

See no problem.
Don't forget to address 250.30