Commercial Kitchen Equipment Ground-Fault and Permit Sequencing
A restaurant in Fairbanks is adding a 208 V, 3-phase commercial dishwasher (nameplate 40 A, 3-wire plus ground) and a 208 V single-phase 5 kW booster heater. The work is in a commercial kitchen with a wet location at the dish station. The contractor pulls a permit, installs the circuits, and calls for inspection. The inspector finds: the dishwasher on a 50 A breaker with 8 AWG conductors; the booster on a 30 A breaker with 10 AWG; no GFCI protection; the disconnects are general-use switches located 8 ft from the equipment; and the contractor began work before the permit was issued (permit dated after the rough-in). The kitchen has a floor drain and the equipment is within 6 ft of the sink.
1. Evaluate the circuit sizing and GFCI requirements for the dishwasher and booster heater.
Read the worked answer
Dishwasher: 40 A nameplate, 3-phase. Conductors must be at least 125% of nameplate for a continuous commercial load if applicable; for a motor-containing appliance, use nameplate and Article 430 rules. 8 AWG Cu at 75°C = 50 A - adequate for a 40 A load. The 50 A breaker is acceptable as short-circuit protection if the appliance is listed for 50 A max; verify nameplate maximum OCPD. If nameplate says 40 A maximum, a 50 A breaker is a violation - check the label. Assuming 40 A MCA and 50 A MOP, the installation is fine.
Booster heater: 5,000 W at 208 V single-phase = 24 A. 10 AWG at 75°C = 35 A; 30 A breaker is fine for a 24 A continuous load (24 × 1.25 = 30 A - exactly at the limit). Acceptable.
GFCI: Commercial kitchen receptacles and equipment in wet locations require GFCI protection. The dish station is a wet location within 6 ft of the sink. The dishwasher and booster must have GFCI protection (breaker or dead-front GFCI) - the inspector's citation is valid. Equipment requiring GFCI includes receptacles serving the equipment; hard-wired equipment in wet locations should be GFCI-protected per the applicable section.
Disconnects: General-use switches are not permitted as motor disconnects if they are not rated for the load; a motor-rated disconnect is required, and it must be within sight of the equipment (typically within 50 ft and visible). 8 ft is within sight, but the switch must be rated for the horsepower/load and marked.
2. Address the permit-timing issue and the consequences for the contractor under Alaska law and code administration.
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Permit timing: Work began before the permit was issued. Under Alaska law and local code administration, a permit must be obtained before work begins. Starting work first is a violation that can result in:
- Stop-work order.
- Requirement to expose all concealed work for inspection (rough-in must be inspected before cover).
- Additional fees, possibly double the permit fee.
- Disciplinary action against the contractor's license (the Alaska Department of Commerce, Community, and Economic Development, Division of Corporations, Business and Professional Licensing, handles electrician licensing; violations can lead to fines, suspension, or revocation).
The inspector should not simply approve the final; the contractor must:
- Obtain the permit (already done, but late).
- Expose the rough-in for inspection - the buried/concealed raceways must be opened.
- Correct the GFCI and disconnect deficiencies.
- Pay any penalty fees.
Exam point: Code administration requires inspection at rough-in and final stages; skipping the rough-in inspection means the inspector cannot verify conductor sizing, box fill, and grounding before concealment. The contractor bears the cost of exposing work. The late permit is a separate administrative violation from the technical deficiencies, and both must be resolved before the certificate of occupancy is issued.