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2500 amp service
#216019
09/07/15 08:47 PM
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Joined: Jan 2004
Posts: 171
OP
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Looking for some suggestions.....I am quoting a job to install a 2500 amp, 480/277V service. This will be feed from a pad mount transformer about 30 feet into a building. Obviously it will be parallel conductor fed. What combination would you all use? 750kcmil, 1000kcmil,.....any thoughts?
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Re: 2500 amp service
[Re: Merlin]
#216020
09/07/15 08:56 PM
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Joined: Mar 2004
Posts: 947
Member
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Aluminum. Then, all sizes are easy.
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Re: 2500 amp service
[Re: Merlin]
#216021
09/07/15 09:35 PM
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Joined: Apr 2002
Posts: 7,237
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Merlin:
Common is 6 sets of 600 KCMil Cu THHN/THWN in 4" PVC
You have to check the secondary 'window' of the pad mount xfr., as that limits the quantity of conduits you can install.
John
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Re: 2500 amp service
[Re: HotLine1]
#216042
09/16/15 12:19 AM
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Joined: Jan 2004
Posts: 171
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Member
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Correct me if I'm wrong, but 6-600's would be 6 x 475 = 2850. Derated for 4 conductors in conduit(480/277) at 80% 2850 x .8 = 2280.
Wouldn't it be 6x750kcmil? 6 x 535 = 3210 3210 x .8 = 2568
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Re: 2500 amp service
[Re: Merlin]
#216045
09/16/15 11:35 AM
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Joined: Apr 2002
Posts: 7,237
Member
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Merlin: I stand corrected....I did not 'see' 2500 amps.
John
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Re: 2500 amp service
[Re: Merlin]
#216073
09/22/15 02:10 AM
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Joined: Oct 2000
Posts: 2,721
Broom Pusher and Member
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If this Installation is for Service Feeders (from a Poco Transformer to Service Equipment), you need to verify the requirements with the Service Planner before bidding this Project (or before commencing the actual work!) If the Installation is on the LOAD side of the Service Disconnect, then (6) 4" Ducts with 4-750MCM CU. per duct is sufficient... if NO Equipment Grounding Conductors are installed! If an EGC is to be installed, that will be a minimum of (1) 350MCM CU. per duct, so now the Ducts would be 5" (???)  --Scott (EE)
Scott " 35 " Thompson Just Say NO To Green Eggs And Ham!
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