VAV's needed dedicated circuits

[JohnnyPElec]

Working on a batch of jobs currently passed down from a prior engineer where we seem to keep running into the same issue. There are some where the VAV's operated solely off 24V, so no new electrical was shown for them on the plans. There are others where there seems to have been a lapse in coordination where the selected VAV's require 277V to feed internal 277V/24V transformers. The EE gave prior direction before leaving to simply daisy chain these from nearby 277V circuits or sources. As these aren't jobs I worked on from origination, I have hesitancy to say this is OK. Would it not just make more sense to provide a single 277V, 20A/1P circuit and daisy chain all of the VAV's and be done with it, to give them a reliable, traceable source of power?

 

[gadfly56]

Working on a batch of jobs currently passed down from a prior engineer where we seem to keep running into the same issue. There are some where the VAV's operated solely off 24V, so no new electrical was shown for them on the plans. There are others where there seems to have been a lapse in coordination where the selected VAV's require 277V to feed internal 277V/24V transformers. The EE gave prior direction before leaving to simply daisy chain these from nearby 277V circuits or sources. As these aren't jobs I worked on from origination, I have hesitancy to say this is OK. Would it not just make more sense to provide a single 277V, 20A/1P circuit and daisy chain all of the VAV's and be done with it, to give them a reliable, traceable source of power?

I'd say yes, depending on the quantity and geographic spread of the VAV's.