Today a contractor questioned me about the location of a safety switch for a dish washing machine and a small baking oven (like Subway uses) in a new restaurant that I am inspecting.
The disconnect for the dishwasher would be (as per the plans) directly over a stainless steel sink used to rinse dishes and the disconnect for the oven would be over another small stainless sink and counter.
He knew that the disconnects should not be there, so he contacted me for guidance and an acceptable location.
Seeing that space was very limited in the areas in question, I brought out my 2005 code book and did some research.
I found that 422.31(B) was revised allowing the circuit breaker to act as the disconnecting means so long as a permantly installed lock-out device is installed on the circuit breaker.
I instructed him to eliminate the safety switches in both locations, install a cord and plug for the baking oven and install the lock-out hardware on both circuit breakers.
Do you all agree that this meets the requirements of the NEC?
422.31(B) Appliances Rated Over 300 Volt-Amperes or 1/8 HP. For Permanently connected appliances rated over 300VA or 1/8 HP, the branch circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance OR is capable of being locked in the open position. The provision for locking or adding a lock to the disconnecting means shall be installed on or at the switch or circuit breaker used as the disconnecting means and shall remain in place with or without the lock installed.
And, yes the oven is not very heavy and is on wheels.
[This message has been edited by master66 (edited 05-13-2005).]
Re: Appliance Disconnect in Restaurant#51860 05/14/0508:01 AM05/14/0508:01 AM
We have installed several ovens of the type you describe. In 4 of 5 we use the C/B as the disconnecting means even though it is NOT in the line of sight but IS cabable of being locked in the open position. We have never had an inspector question this. On the few where lock out is questionable or not an option, we install a disconnecting means within the line of sight, generally adjacent to or near the equipment.
Re: Appliance Disconnect in Restaurant#51861 05/14/0509:59 AM05/14/0509:59 AM
I agree with your thinking and I too would accept a lockable breaker as the disconnecting means. We had this discussion before, I like the idea of a plug and cord for ranges. There are times when you can accept the unit ON/OFF switch ( per 422.34 ) as the disconnected means.
Re: Appliance Disconnect in Restaurant#51862 05/14/0512:52 PM05/14/0512:52 PM
I don't understand how 422.32 interplays with 422.31:
422.32 Disconnecting Means for Motor-Driven Appliance. If a switch or circuit breaker serves as the disconnecting means for a permanently connected motor-driven appliance of more than 1⁄8 hp, it shall be located within sight from the motor controller and shall comply with Part IX of Article 430.
It appears that 422.31 giveth, and 422.32 taketh away, with the question of whether you can use a LOTO circuit breaker that's not in line-of-sight as the disconnection means.
Does anyone here have any insight into this apparent discrepency?
[This message has been edited by SolarPowered (edited 05-15-2005).]