05 - Required and Dedicated Branch Circuits: Kitchen Circuits, Bathrooms, Appliances

Send us Fan MailCertain branch circuits are required in modern homes to ensure adequate electrical capacity and safety. This episode covers required individual circuits, dedicated circuits, multiwire branch circuits, and proper circuit loading.Required Individual Branch Circuits:Kitchen Countertop Circuits:TWO 20-amp, 120V circuits serving ONLY kitchen countertopsMay also serve breakfast and dining room receptaclesOne circuit may serve refrigeratorThese are the most commonly violated requirementsBathroom Circuits:ONE 20-amp, 120V circuit per bathroom (lights AND receptacles)OR one 20-amp, 120V circuit serving ONLY all bathroom receptaclesMust not serve other areasLaundry Circuit:ONE 20-amp, 120V circuit serving ONLY laundry receptaclesDedicated to laundry areaHVAC Circuits:120V or 240V circuits serving ONLY one furnace or air handlerEach piece of equipment on separate circuitDedicated 240V Circuits:Water heatersAir conditioning condensersWell pumpsElectric ranges, wall ovens, cooktops (usually dedicated, some exceptions)Electric dryersOptional Dedicated Circuits:Kitchen exhaust fan/microwave: 20-amp, 120V (if installed)Dishwasher: May require dedicated 120V circuitFood-waste disposer: May require dedicated 120V circuitGeneral Lighting Branch Circuits:No specific limit on quantity of receptaclesLoad must be evenly distributedFixed appliance: ≤50% of circuit amperage (≤7.5A on 15A circuit)Cord-and-plug appliance: ≤80% of circuit amperage (≤12A on 15A circuit)Receptacle Ratings:15-amp circuits: 15-amp receptacles ONLY20-amp circuits: 15-amp OR 20-amp receptacles20-amp receptacles: Identified by T-slot (horizontal notch in neutral slot)Multiwire Branch Circuits:Three-wire circuit: two hot wires + one neutral240V between hot wires, 120V between each hot and neutralVoltage on shared neutral should be zero under normal operationExamples: Split-wired kitchen receptacles, dishwasher/disposer circuits, dryer/range circuitsREQUIRED: Approved handle tie connecting both circuit breakersSafety: Both hot legs must disconnect simultaneouslyTypical Defects to ReportKitchen with only one 20-amp countertop circuitKitchen circuits serving other areas (lights, other rooms)Bathroom circuit serving multiple bathrooms or other areasLaundry circuit serving other areasMultiwire branch circuit without handle tie on breakersReceptacle rating doesn't match circuit ratingFixed appliance exceeding 50% of circuit capacityCord-and-plug appliance exceeding 80% of circuit capacityKey TakeawaysKitchen requires TWO dedicated 20-amp circuits for countertopsBathroom circuits must be isolated from other areasMultiwire circuits MUST have handle ties (safety requirement)Receptacle ratings must be compatible with circuit amperageMost 240V appliances require dedicated circuitsOlder homes without these circuits aren't necessarily deficientIRC Code ReferencesIRC 2018: E3703 (required branch circuits)Intro This episode is brought to you by GetSync.pro This episode is hosted by Charlie Bellefontaine of Chicagoland Home InspectorsFor complete training with visual materials, practice exams, and certification support, visit nhiexamprep.com© 2025 National Home Inspector Exam Prep Podcast. All rights reserved.