Does a commercial dishwasher need a separate disconnect.

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steve66

steve66

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Illinois
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Engineer
Anyone who has installed commercial dishwashers before, do you recall if they required a separate disconnect, or did they have an off switch that met the requirements for disconnecting all the phases?

I am trying to do bid documents for a project where we don't even have a final equipment list (I don't know exactly what model the dishwasher will be).

Normally I would just go ahead and throw a disconnect in the bid documents, but for a dishwasher, I'm thinking Stainless Steel NEMA 4. $$$$$. So I hate to include it if its really not necessary.

Steve
 
American made commercial DWs generally need a disconnect added.

Non-American commercial DWs will often have a unit switch that meets the requirements.

For the price of a disconnect I would include it, many times a 60A 250V 3PH NF NEMA 1 will do it. YMMV
 
infinity said:
Why not figure on using a breaker lock to satisfy the requirement?
Click to expand...

I believe a commercial DW would be into 422.32 which requires the breaker to be in sight if you want to use it as the disconnecting means.

The exception to that is if you are using unit switch per 422.34(A)(B) or (C).
 
iwire said:
I believe a commercial DW would be into 422.32 which requires the breaker to be in sight if you want to use it as the disconnecting means.

The exception to that is if you are using unit switch per 422.34(A)(B) or (C).
Click to expand...


Why wouldn't 422.31(B) apply?
 
It is important to keep in mind article 422.31 (A and B) The issue of breaker locks is becoming an issue.

Charlie
 
Let's remember that this dishwasher will have a 2hp motor or somewhere close.
Been a while but I dont remember one having a unit switch and all that I have ever worked with required a disconnect. Last one I installed was in the late 80s.

Edited to add:
Don't forget that this washer might have a booster heater
 
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infinity said:
Why wouldn't 422.31(B) apply?
Click to expand...

IMO it does.

Apply 422.31(B), than apply the requirements in 422.32.

422.31(B) says yes you can use the breaker and 422.32 says if you do it has to be in sight.
 
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cpal said:
It is important to keep in mind article 422.31 (A and B) The issue of breaker locks is becoming an issue.

Charlie
Click to expand...

Don't keep us in suspense!! What issue are you refering to?

I see they expanded 422.31(B) in the 2005. Or are you refering to most manufacturers padlock provisions are totally cheesy for small C/B's?
 
"Don't keep us in suspense!! What issue are you refering to?"


I guess the issue slants more towards non motor operated appliances, (no unit off sw 422.34), The breaker is allowed to serve as the disconnect when not within sight, and a pemanent meands to lock the breaker off is supplied.

Its a violation that occurs more often than it should.


Charlie
 
I think 422.32 requires a disconnect in sight. I don't know if it will have a unit switch that would comply with the exception, so I'll leave the disconnect in.

Got the booster heater covered also. Actually, I think its a booster-booster heater. One booster heater for the kitchen, another for the dishwasher.

Steve
 
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