Article 422.10 says the branch circuit rating for an appliance must not be less than that marked on the appliance. Shouldn't this be 'more' not 'less'? For instance, this means a 30 amp branch circuit can protect a 15 amp rated appliance? But if it was worded for 'more', then a 15 amp branch circuit can supply a 30 amp appliance. While this isn't practical it seems safer than scenario #1, no?
Appliance branch circuit rating
- Thread starter cppoly
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jumper
Senior Member
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- 3 Hr 2 Min from Winged Horses
The meaning is clear to me, the conductors and OCPD must be sized to carry the load.
- Location
- Massachusetts
422.11 addresses the 'not more than' part of it.
- Location
- Connecticut
- Occupation
- Engineer
Read 422.11, as well.
Edit: Bob types faster than me
Edit: Bob types faster than me
Read 422.11, as well.
Edit: Bob types faster than me
Sometimes I don't know when to ask questions when the answer can literally be 2 paragraphs over but I get so fixated on trying to understand a particular topic so I ask anyway. Ok this makes sense. Although it is convoluted. 422.10 says not less and 422.11 says not more. How about they make a section 422.09 that says must be EQUAL
- Location
- Lockport, IL
- Occupation
- Semi-Retired Electrical Engineer
Not so; you have it backwards. A breaker does not protect an appliance. What a breaker does protect is the branch circuit conductors. You size the branch circuits to handle the connected load. The appliance's nameplate rating gives you the load.
- Location
- Massachusetts
I disagree, the breaker protects both. That is why there are limits in 422.11 about the overcurrent protection allowed for appliances.
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