Instantenous water heater

[hhsting]

I have 4.1kw, 277V single phase instantaneous water heater full load amps of 14.8A. The breaker provided is 20A. Since instant water heater is non continuous load should not the breaker be sized 15A?

 

[augie47]

See 422.11
(same thing we told you here ( https://forums.mikeholt.com/threads/instantaneous-water-heater.2562782/#post-2691728 )

 

[hhsting]

See 422.11
(same thing we told you here ( https://forums.mikeholt.com/threads/instantaneous-water-heater.2562782/#post-2691728 )

Right but that thread goes into space heaters

 

[LarryFine]

I have 4.1kw, 277V single phase instantaneous water heater full load amps of 14.8A. The breaker provided is 20A. Since instant water heater is non continuous load should not the breaker be sized 15A?

In my opinion that would be too little headroom for any type of load.

 

[petersonra]

I have 4.1kw, 277V single phase instantaneous water heater full load amps of 14.8A. The breaker provided is 20A. Since instant water heater is non continuous load should not the breaker be sized 15A?

I tend to agree it is noncontinuous but I would be using a 20 A cb.

 

[augie47]

You:
Question:

1. Where does NEC 2017 section 422 talk about instantaneous water heater breaker sizing?

Don:
422.11(E)(3)