125% of load or not

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tim89s

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Brush Prairie WA
I am wiring a large instant hot for a safety shower. The fla is 87 amps. The shower is designed to run for 15 minutes. I sized the conductors and overcurrent according to the fla because this is
not considered a continuous load. The instant hot has arrived and the instructions want is protected at 110 amps and 1/0 conductors to be used. Did I wire this correctly according to code?
 
If the instructions are part of the the listing of the equipment you need to follow them. Not sure why you would need a #1/0 conductor for a 110 amp load.
 
I suppose it is possible that the instructions were written, assuming that the heater would be used regularly, all through the day - rather than once-in-a-blue-moon emergency shower.
 
I’m with infinity. To add: It seems the Manufasture believes their appliance will run continuously. Assuming they are using the 60 degree column—with emphasis on a specific type of cable--it seems they may feel VD is a concern—seeing that they require 1/0 conductor. Interesting.
 
If you are interested, call the manufacture (Engineering) and see if they can give you an answer. Check back--as this may be interesting, or maybe straight forward.
 
resistance said:
If you are interested, call the manufacture (Engineering) and see if they can give you an answer. Check back--as this may be interesting, or maybe straight forward.
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<< great idea


And if you get an answer that is in your favor, make sure you take that in writing.
 
Manufacturer trumps NEC and the NEC does not require 125% if their is no storage tank. OCPD is allowed to be 150% 422.11(E) so I don't know why they want 1/0. I hate the manufacturers dictating when in fact they don't know what they are requiring most of the time.
 
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