HVAC package unit

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JDB3

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San Antonio, Texas
I am in the process of bidding on a job that will have 8 package (all in one) HVAC units. They will have 15 KW of 3 phase (230/120) heat. The information on these units states they will draw 36 amps; 50 amp min. & 60 amp max. over-current protection; #6 copper supply with #10 grounding conductors.

Been a while since I have done any 3 phase. Does the above sound right? :?
 
JDB3 said:
The information on these units states 50 amp min. & 60 amp max. over-current protection
Click to expand...

This is the relevant information. Unless you're using NM cable you could likely use #8 conductors and a 60 amp OCPD. #6 will work too.
 
The work will probably be in EMT to the disconnect & then liquidtight flex to the unit. This is a location where they erase data from "used" phones and get the phones ready for re-furbishing. They have a very high security level at this site (on site guard, wand, walk through detector) as strong as at airports.

Since manufactures spec. #6, I might just use that. OR see about permission to use #8 and then 3/4" conduit (would be nice) .
 
JDB3 said:
The work will probably be in EMT to the disconnect & then liquidtight flex to the unit. This is a location where they erase data from "used" phones and get the phones ready for re-furbishing. They have a very high security level at this site (on site guard, wand, walk through detector) as strong as at airports.

Since manufactures spec. #6, I might just use that. OR see about permission to use #8 and then 3/4" conduit (would be nice) .
Click to expand...

Since the MCA is 50 amps, using #8 THHN with EMT will allow you to use the 75° C ampacity of that conductor which is 50 amps but if the spec calls for #6 you will likely need to use that instead.
 
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