commercial dishwasher 60 amp 208v 3 phase or 100 amp 208v single phase GFCI requirements

Vincent Hetrick

Vincent Hetrick

Member
Location
Florida
Occupation
EC
good morning all, I need help with an upcoming job. I have a commercial dishwasher to bid that we can't seem to find a GFCI breaker for (if even needed). the dishwasher is 60 amp 3 phase 208v or 100 amp single phase 208 volt. does the NEC require GFCI protection for this application or will a standard breaker be sufficient?
 
Is this in a kitchen? For cord and plug connected:

210.8(B) Other Than Dwelling Units.
All 125-volt through 250-volt receptacles supplied by single-phase branch circuits rated 150 volts or less to ground, 50 amperes or less, and all receptacles supplied by three-phase branch circuits rated 150 volts or less to ground, 100 amperes or less, installed in the locations specified in 210.8(B)(1) through (B)(12) shall have ground-fault circuit-interrupter protection for personnel.
(1) Bathrooms
(2) Kitchens or areas with a sink and permanent provisions for either food preparation or cooking
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Specific appliances:
422.5 Ground-Fault Circuit-Interrupter (GFCI) Protection for Personnel.
422.5(A) General.
Appliances identified in 422.5(A)(1) through (A)(7) rated 150 volts or less to ground and 60 amperes or less, single- or 3-phase, shall be provided with Class A GFCI protection for personnel. Multiple Class A GFCI protective devices shall be permitted but shall not be required.
(1) Automotive vacuum machines
(2) Drinking water coolers and bottle fill stations
(3) Cord-and-plug-connected high-pressure spray washing machines
(4)Tire inflation machines
(5)Vending machines
(6)Sump pumps
(7)Dishwashers
Informational Note: Section 210.8 specifies requirements for GFCI protection for the branch-circuit outlet where the covered location warrants such protection.
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Which NEC edition applies?

specific appliances Infinity mentioned were moved to 210.8(D) in 2023, and some additional appliances were added.
 
infinity said:
60 amp required {422.5(A)(7)}, 100 amp not required.
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Looks like DW will exceed 60A, unless bidding with ground-fault relay & shunt trip breaker.
www.nktechnologies.com

GFCI Engineering Presentation

Live Interactive Training: Avoid Costly Panel Mistakes You will likely encounter a panel design that calls out a “60-100A 3-phase GFCI breaker.” Then, you will discover that no manufacturer offers such a breaker in this configuration. Learn what you need to know to avoid costly panel mistakes...
www.nktechnologies.com www.nktechnologies.com
 
infinity said:
Who knows, only going by what the OP stated.
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Vincent Hetrick said:
the dishwasher is 60 amp 3 phase 208v or 100 amp single phase 208 volt
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So it must not have any load that must be connected to three phase circuit, probably a water heater included that can be connected either single or three phase by rearranging connections. If you connect it to three phase and use the 60 amp circuit then NEC would require GFCI. If you connect to single phase and use the 100 amp circuit GFCI not required by NEC.

Everything same at the dishwasher either way except heater elements connected in parallel one way and likely in a delta configuration the other way, but apparently the potential shock hazards are different for 60 amps vs 100 amps supply circuit of the same voltage ? :unsure:

For something that really isn't much a problem in the first place unless maybe it were cord and plug connected.
 
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