?
Friday, January 14, 2005
Question:
Question: Reference code question of the day December 23, 2004.
If a microwave oven can't be connected to one of the two required small-appliance branch circuits, then what can it be connected to? The code never references a microwave that I can see. Stating that NEC 210.52(B)(1)(2) does not include a microwave oven is fine but that section also does not include crock pots and or roaster pans, that will always be connected to these small appliance circuits. Microwaves are also not referenced in article 422 as an appliance load, like disposers and dishwashers are.
Where does the NEC reference a microwave oven? Does a microwave require its own branch circuit? If so can it be on a 15A circiut or is 20A required?
I realize that the manufacturers recommendations and instructions should indicate the recommended circuit size but at the time a house is built the contractor does not have the information for what the owner will purchase. I just do not see where the NEC applies to microwaves, I have always installed separate circuits but I am not sure why!
Alan Hartley
Church & Murdock
A
Answer:
Hey Allen, a microwave oven is an appliance and must be used or installed in accordance with the requirements of Article 422. Microwave ovens are permanently installed or are a portable type. A countertop portable type may utilize one of the two or more small-appliance branch-circuits if desired as is permitted for “crock pots or roaster pans.”
A permanently installed type cannot be supplied by any of the two or more small-appliance branch circuits in accordance with 210.52(B)(2). A microwave oven generally draws around 13 amperes and must be installed in accordance with NEC 210.21(B)(1). A 20-ampere circuit with a 20-ampere rated single receptacle is required.
Dishwashers and kitchen waste disposers are specifically referenced in 422.16 because of their flexible cord requirements.