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Joined: Mar 2005
Posts: 237
Member
My question is I have a 250 gallon Water heater do I calculate at 100% or 125%? This is branch circuit not feeder calculations. Thanks

2017 / 2014 NEC & Related Books and Study Guides
Joined: May 2005
Posts: 984
G
Member
That's a big tank.
Is this for a locker room with showers?


Ghost307
Joined: Mar 2005
Posts: 237
Member
OK I see article 422.10 says 125% but where is the code reference to the breaker size one size higher? My water heater is listed at 87 A so 90 A is next standard breaker size.

Joined: May 2005
Posts: 984
G
Member
You need to take 125% of the full load current; so it needs to be treated as a 108.75A load.
Make sure to also upsize the wire accordingly.


Ghost307
Joined: Mar 2005
Posts: 237
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Thanks, ghost.
H20

Joined: Mar 2005
Posts: 237
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Yeah exactly gym inside google bldg.
H20


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