Restaurant and commercial kitchen electrical in Phoenix

In a restaurant, the kitchen equipment schedule drives most of the electrical design. Each line lists a piece of equipment with its voltage, phase, amperage, connection type and location, and the food service designer or the franchisor usually issues it with the plans. A busy kitchen can have dozens of lines: fryers with electric controls, combi ovens, dish machines with booster heaters, ice machines, reach-ins, prep tables, warmers and the hood.

Before we price the job, we compare the schedule to the electrical drawings line by line and to the building service. Voltage is the usual problem. Many strip-center buildings in the Valley have 208-volt three-phase power, and equipment ordered at 240 volts may not perform as rated, heating equipment especially. Catching that before the equipment ships takes a phone call. Catching it at startup can push the opening. We also confirm which items plug in and which are hardwired, and match each receptacle to the cord cap the equipment ships with.

The hood ties several trades together. The mechanical code requires the exhaust fan to run whenever the cooking equipment under the hood is operating, and the makeup air fan is typically interlocked to run with it. The hood controls usually ship with the hood. We power them, wire the fan starters and hood lights, and connect the interlocks the plans call for.

When the fire suppression system in the hood discharges, power to the electric cooking equipment under it has to shut off. That is usually done with shunt-trip breakers or a contactor, triggered by a switch in the suppression system. The suppression installer provides and sets that switch, and the fire alarm contractor handles any connection to a building fire alarm. We wire the shunt-trip side, label it on the panel schedule, and coordinate with the suppression installer on the system test, so the fire inspection does not stall on a wiring question.

A walk-in is several electrical loads in one: the condensing unit, often on the roof in Valley strip centers, the evaporator coil inside the box, freezer door and frame heaters, interior lights and sometimes a heated drain line. Each part has a nameplate with a minimum circuit ampacity and a maximum breaker size, and we size the circuits and disconnects to those numbers. The code also requires a service receptacle near rooftop refrigeration equipment.

Who wires what on a walk-in varies from job to job, so we settle it in writing with the refrigeration contractor early: who brings power to which disconnect, who runs the control wiring between the evaporator and the condensing unit, and who sets the box lights. Timing matters too. The walk-in has to be wired, running and down to temperature before the health inspection and the first food delivery. A rooftop condensing unit works hard in a Phoenix summer, so we push to get it on permanent power early enough to prove it holds temperature.

Recent editions of the National Electrical Code require GFCI protection for most receptacles in commercial kitchens, including many 208-volt and 240-volt receptacles for plug-in equipment. Exactly which receptacles are covered depends on the code edition your city has adopted, and Valley cities do not all use the same one.

GFCI protection makes sense in a wet, busy kitchen, but some equipment trips GFCI devices with no fault present. Older refrigeration, some motors and some heating equipment are the usual suspects, and a reach-in that trips overnight can cost a full load of product. We review the equipment list for known problem items, use the right type of GFCI device for each circuit, and work with the equipment supplier when a unit will not hold. The goal is protection that passes inspection and stays on through a Friday dinner rush.

Dining rooms and bars usually get dimmable lighting set up in scenes the staff can change between lunch and dinner, along with the pendants and accent lights the designer specified. The energy code may require lighting controls in the space, so we set them up so they do not darken the dining room in the middle of service.

Patios in the Valley get used most of the year when they are wired for it. Summer brings fans and misting system pumps. Winter brings electric patio heaters, which draw a lot of current and need their own circuits. Outdoor receptacles need GFCI protection and covers that stay weatherproof with a cord plugged in. For the sign, the code generally requires a sign outlet at each tenant entrance, and the landlord or city usually controls when the sign can be lit. We provide the circuit and the time clock or photocell, and the sign company installs and permits the sign.

Franchise restaurants come with a prototype plan set and an equipment package. The kitchen layout repeats from site to site, but the building changes. One site has a three-phase service with room to spare. The next is a second-generation restaurant with an old hood, a panel full of mislabeled breakers and circuits the last tenant abandoned in the ceiling. We price each site from its own existing conditions, map the prototype circuits onto what is there, and send questions to the architect of record before rough-in.

A ground-up pad with a drive-thru adds site lighting, underground conduit to the menu boards and order point, and a new service from APS or SRP. The utility sets its own schedule for designing and building a new service, so we start that process as soon as the load is known.

Before you sign the lease on a second-generation space, have us look at what is there. An existing hood, a large panel and a three-phase service can save real money, but only if they match your equipment. For ground-up and pad sites, call when the site plan is drawn, because a new utility service is often one of the longest lead items on the electrical side.

Then work backward from the opening date. The walk-ins need permanent power and time to pull down to temperature. The hood needs a passing suppression test. Staff training needs working equipment. Electrical finals come before most of that, so we schedule our inspections early and keep the GC informed of every date. Send the plans and equipment schedule to contact@prcselectrical.com or call 602-935-7971.