27kW Instant Hot Water Heater Circuits

[jar546]

There are different sizes of electric tankless water heaters, gaining popularity. Depending on the size, they do draw a lot of power. Some, like the popular 27kW water heater takes 3 separate 40A circuits. I came across one that was fed by a single FMC (Greenfield) which brings me to this code section:

210.7 Multiple Branch Circuits. Where two or more branch
circuits supply devices or equipment on the same yoke or
mounting strap, a means to simultaneously disconnect the
ungrounded supply conductors shall be provided at the point
at which the branch circuits originate.

Therefore, when a panel has 3 double pole 40A breakers in it to feed a single water heater through a single FMC, how do they comply with NEC 210.7 if the panel that feeds it is a sub-panel with no main disconnect. I believe that a main disconnect, although it turns the entire panel off, still meets the code requirement.

What say thee?

 

[chris kennedy]

I say you wire that up as per 110.3(B) and later go toe to toe with a guy like you,

 

[jar546]

I say you wire that up as per 110.3(B) and later go toe to toe with a guy like you,

You are up too late and can't think straight. Get to bed old man..... LOL

 

[steveray]

I do not believe the main is "the point
at which the branch circuits originate."....IMO