Standard breaker size

[david luchini]

Ok but the question still remains manufacturer wont list in water heater manucturer instruction bkr size Article 422.11(E)(3) and why? Does it not apply? If it applies then why not list it?

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Nothing required the manufacturer to list a maximum breaker size, so why list it? It's just going to be the same thing the Code already tells you.

 

[jap]

My experience has been a water heater this size would meet the 422.13 requirement and only be permitted to be sized at 125%. Nonetheless, it still calculates to the 25A OCPD, but you can see how it might change depending on what number you plug in.

But there is a difference,

422.11(e) indicates "Not to exceed 150%".
422.13 refers to 422.10 which indicates "Shall not be less than 125%".

JAP>