--- title: "Under the Cooktop: Junction Box, Conduit and Gas Shutoff" description: "What belongs in the base cabinet for gas, electric and induction tops, the circuit and junction box, the shutoff and connector, and what an owner may check." url: "https://cooktoprepair.center/guides/cooktop-wiring-and-gas-shutoff-under-the-counter/" date_modified: "2026-09-26" --- Installation and setup # Under the Cooktop: Junction Box, Conduit and Gas Shutoff The cooktop junction box sits in the base cabinet under a radiant or induction top, fed by its own 208/240-volt circuit and joined to the cooktop by flexible conduit with slack for service. A gas cooktop or rangetop has instead a reachable manual shutoff valve, a connector and a pressure regulator, plus a 120-volt outlet for the igniters. Owners locate and label; electricians and gas technicians connect. By [CooktopRepair.center technical team](https://cooktoprepair.center/authors/technical-team/) Published September 26, 2026 ## At a glance. Open the doors under a cooktop and you are looking at the whole supply side of the appliance: a metal junction box and a coil of armored conduit for an electric or induction top, or a valve, a flexible connector and a regulator for a gas one. Knowing what belongs there, and what should never be touched, makes every later service visit faster and safer. Read the whole guide ### Electric and induction supply Its own 208/240-volt circuit Dacor asks for a double-pole breaker of at least 40 amps for its 30-inch induction top and 45 amps for the 36-inch. ### Junction box position Low enough to stay cool, with slack Dacor places it at least 15 inches below the countertop, with enough conduit slack to move the cooktop for service. ### Gas shutoff A manual valve you can reach GE asks for it in an easily accessible spot near the pipe stub, and for owners to know how to use it. ### Gas cooktops need power too A 120-volt grounded outlet The igniters and any downdraft blower plug in under the counter. In this guide 1. What you should find in the cabinet below 2. The cooktop junction box and its conduit 3. The shutoff valve, connector and regulator 4. A flashlight check for owners 5. Using the cabinet without crowding the connections 6. Step by step 7. Questions ## What you should find in the cabinet below What the base cabinet holds depends on the kind of cooktop above it. Before anyone reaches in, it helps to know which parts are normal and which ones should make you close the doors and call. None of the checks in this guide involve loosening anything; they are about seeing what is there and labeling it while nothing is wrong. ### Below a gas cooktop or rangetop GE's installation instructions for a Monogram downdraft gas cooktop describe the standard set, from the wall inward: - The gas pipe entering through the cabinet back or floor, ending in a manual shut-off valve. - A flexible metal appliance connector, where local codes allow one, or rigid pipe. - The pressure regulator supplied with the cooktop, fitted close to the cooktop's gas inlet. - A grounded 120-volt outlet for the cooktop's plug cord, which powers the igniters. - On a downdraft model, the blower and the duct leaving the cabinet toward the outdoors. ### Below a radiant or induction top An electric or induction cooktop has no plug. A length of flexible armored conduit leaves the underside of the cooktop and ends at a junction box fixed to the cabinet back or the wall behind it, where the cooktop's leads are joined to the house wiring. On an induction top you may also see intake or exhaust openings for its cooling fan, which need to stay clear. ## The cooktop junction box and its conduit Dacor's instructions for its 30- and 36-inch induction cooktops give a representative set of rules. The supply is a 3-wire or 4-wire, single-phase, 208 or 240-volt circuit on a dedicated double-pole breaker of at least 40 amps for the 30-inch top and 45 amps for the 36-inch. The junction box sits at least 15 inches below the bottom of the countertop and within 10 inches of the right side of the cabinet, and a listed conduit connector is needed at each end of the cooktop's cable. Two of Dacor's instructions matter long after installation. The conduit must not be cut; the length supplied is used whole. And the box must sit where the conduit has considerable slack, so the cooktop can be lifted out of the counter for servicing without disconnecting it first. A cooktop wired tight to a box right under the chassis is one that cannot be raised to replace a board or the glass. ### Three conductors or four Older homes often have a three-conductor cooktop circuit, with the appliance's frame grounded through the neutral; newer wiring uses four conductors with a separate ground. GE's induction manual shows both, and says a four-conductor connection is used where local codes do not permit grounding through the neutral. Which applies to your kitchen is the electrician's call, and it is a common reason a replacement cooktop cannot simply be connected the way the old one was. ### Homes with aluminum branch wiring Cooktop leads are copper. Both GE and Dacor warn that joining them directly to aluminum house wiring is dangerous, and require special connectors listed for joining copper to aluminum, used exactly as their maker describes. If your home was built with aluminum branch circuits, say so when booking. Source: [Dacor (Samsung) — Transitional 30- and 36-inch Induction Cooktop Installation Manual (DTI30P876BB, DTI36P876BB)](https://image-us.samsung.com/SamsungUS/dacor/products/cooking/cooktops-and-rangetops/dti30p876bb/download/Dacor-Transitional-Cookop-30-Induction-Cooktop-Install-Maunal.pdf) — 3- or 4-wire 208/240-volt supply on a dedicated double-pole breaker of at least 40 amps (30-inch) or 45 amps (36-inch); junction box at least 15 inches below the countertop and within 10 inches of the right side of the cabinet; listed conduit connector at each end; do not cut the conduit; leave slack for servicing; special connectors for aluminum wiring; 5-inch clearance to a drawer below Close on a metal junction box and a gas shutoff valve on the back wall of the cabinet under a cooktop. ## The shutoff valve, connector and regulator GE's gas cooktop instructions ask for a manual shut-off valve in an easily accessible location, as close to the pipe stub as possible, and ask the installer to be sure the owner knows how and where to shut off the gas to the cooktop. Behind a trash pull-out or a stack of pots, easily accessible can quietly stop being true, so it is worth keeping a clear path to it. The same instructions describe a pressure regulator that stays in series with the cooktop whether it burns natural gas or propane, a flexible connector of 3 to 5 feet where codes allow one, and a leak check with a liquid leak detector at every joint once the gas is on. The cooktop leaves the factory set for natural gas; conversion to propane is done by a service technician or other qualified person. The Public Service Commission of Wisconsin recommends having a qualified person inspect appliance connectors, among other gas equipment, at least every other year. ### Supply to a pro-style rangetop A pro-style rangetop needs the same pieces as a gas cooktop, usually with more burners on one regulator and a larger gas demand. It sits on a base cabinet rather than in a cutout, so the valve and outlet are often reached through that cabinet's doors or from a drawer space removed for access. The same rule applies: know where the valve is, and leave the fittings to a gas technician. Source: [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) — Manual shut-off valve in an easily accessible location near the pipe stub; owner told how and where to shut off the gas; regulator in series for natural gas and LP; 3- to 5-foot flexible connector where codes permit; leak check with a liquid leak detector; shipped set for natural gas, LP conversion by a qualified person; 120-volt grounded plug cord, no extension cord; [Public Service Commission of Wisconsin — Natural Gas Consumer Safety](https://psc.wi.gov/Pages/ServiceType/Energy/PipelineSafety/NaturalGasConsumerSafety.aspx) — Have a qualified person inspect furnaces, vents, appliance connectors and chimneys at least every other year ## A flashlight check for owners With the cooktop off and cool, a flashlight and a few minutes are enough for a useful look. The aim is to spot trouble and to have answers ready for the booking, not to fix anything: - The breaker for an electric or induction cooktop is labeled at the panel, and you know which one it is. - The junction box has its cover on and no bare wire is visible anywhere. - The gas shutoff valve can be reached without emptying the cabinet. - The gas connector is not kinked, crushed by a drawer or rubbing on a sliding bin. - The igniter cord of a gas cooktop is plugged fully into its outlet, with no extension cord. - Nothing is stored against the conduit, the regulator or an induction top's air openings. ## Using the cabinet without crowding the connections The cabinet under a cooktop is prime storage, and most problems we find there come from how it is used rather than how it was built. Pull-out trash bins and drawer boxes that slide under the regulator or the conduit can wear through a connector or bend a fitting over years of daily use. Aerosol cleaners and solvents are better kept elsewhere, especially under a gas cooktop. Dacor's instructions ask for at least 5 inches from the top of the countertop to the top of any drawer below its induction cooktop; for a gas or downdraft model the space needed is usually greater. If a drawer was added after the cooktop went in, check that it clears the chassis, the conduit and the gas connection through its whole travel. Source: [Dacor (Samsung) — Transitional 30- and 36-inch Induction Cooktop Installation Manual (DTI30P876BB, DTI36P876BB)](https://image-us.samsung.com/SamsungUS/dacor/products/cooking/cooktops-and-rangetops/dti30p876bb/download/Dacor-Transitional-Cookop-30-Induction-Cooktop-Install-Maunal.pdf) — 3- or 4-wire 208/240-volt supply on a dedicated double-pole breaker of at least 40 amps (30-inch) or 45 amps (36-inch); junction box at least 15 inches below the countertop and within 10 inches of the right side of the cabinet; listed conduit connector at each end; do not cut the conduit; leave slack for servicing; special connectors for aluminum wiring; 5-inch clearance to a drawer below ## Where to stop Do not open a junction box, disconnect or reconnect cooktop leads, change a breaker, loosen a gas fitting, swap a connector or convert a cooktop between natural gas and propane. Wiring goes to a qualified electrician with the breaker locked off, gas work to a gas technician, and any gas smell means leaving the house and calling the utility from outside. Written by [CooktopRepair.center technical team](https://cooktoprepair.center/authors/technical-team/). The technicians sent out on the cooktop visits booked through this site. What they write comes from lifting tops out of countertop cutouts and working in the cabinet underneath, checked against the manufacturer's installation and use-and-care guides wherever those are published. Sources: [Dacor (Samsung) — Transitional 30- and 36-inch Induction Cooktop Installation Manual (DTI30P876BB, DTI36P876BB)](https://image-us.samsung.com/SamsungUS/dacor/products/cooking/cooktops-and-rangetops/dti30p876bb/download/Dacor-Transitional-Cookop-30-Induction-Cooktop-Install-Maunal.pdf) · [GE Appliances — Induction Cooktop Use and Care Guide and Installation Instructions (49-8269)](https://www.geappliances.com/content/older-pdfs/49-8269.PDF) · [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) · [Public Service Commission of Wisconsin — Natural Gas Consumer Safety](https://psc.wi.gov/Pages/ServiceType/Energy/PipelineSafety/NaturalGasConsumerSafety.aspx) ## Step by step. Five steps, in the order worth doing them. 01 ### Switch everything off Turn every zone or burner off and let the cooktop cool before opening the cabinet. 02 ### Look, do not touch With a flashlight, find the junction box or the gas valve, connector, regulator and outlet. 03 ### Label the panel Identify and label the cooktop's breaker, and the oven's if one shares the cabinet. 04 ### Clear the path Move storage so the valve can be reached and nothing presses on the conduit or connector. 05 ### Note what you saw Photograph the setup and the rating label; it helps the technician bring the right parts. For the heart of your home. ## Questions owners ask. ### Why is there no plug on my induction cooktop? Radiant and induction cooktops draw too much current for a household plug, so they are hard-wired to a junction box on their own 208/240-volt circuit. The breaker is the switch. ### Can I plug a gas cooktop into an extension cord if the outlet is too far away? No. GE's manual says not to use an extension cord; the outlet should be placed where the cooktop's own cord reaches it, which is an electrician's job. ### How do I know the gas shutoff under the counter is for the cooktop? It should be the valve closest to where the connector leaves the pipe and runs up to the cooktop's regulator. If you are unsure, ask the technician to confirm it at the next visit rather than testing it yourself. ## The problems behind it. Each has a page of its own: what it usually means and the causes in the order worth checking. [All 17 problems](https://cooktoprepair.center/problems/) Gas, fire, broken glass or live current ### Cooktop Tripping Breaker 6 causes, cheapest first Problem ### Cooktop Igniter Keeps Clicking 5 causes, cheapest first Gas, fire, broken glass or live current ### Cooktop Gas Smell 5 causes, cheapest first ## When it needs a technician. The repairs on the right are where this guide ends when the checks do not settle it. ### Diagnostic visit A visit that runs every burner or zone on the cooktop, looks under it from the cabinet below and names the failed part before anything is ordered. ### Spark module and gas valve repair The parts deeper in a gas cooktop: the spark module that fires the electrodes, the switches on the valve stems, the valves that meter the flame and the regulator. ### Induction board and coil repair Induction zones that stop sensing pans, cut out, buzz or show codes, traced to the power boards, the coils, their sensors and the links to the controls. ## More in installation and setup. The counter cutout and its clearances, the circuit and the junction box, the gas shutoff and connector under the counter, what the cabinet below may hold, and converting a cooktop to propane. [The whole section](https://cooktoprepair.center/guides/installation-and-setup/) Set up to last ### Cooktop Cutout Dimensions and a Counter That Fits Why the opening belongs to one model, the clearances above and beside it, what the cabinet below must clear, sealing the edge and fit problems that surface later. Set up to last ### A Cooktop Over a Built-In Oven: Approved Pairs and Cabinet Height Why makers approve stacked pairs by model number, the floor-to-counter height, the regulator elbow on gas tops, mixing brands and service in a shared cabinet. Guides ### All 18 guides Six sections, by what you are trying to find out. --- **[Read on the site: Under the Cooktop: Junction Box, Conduit and Gas Shutoff](https://cooktoprepair.center/guides/cooktop-wiring-and-gas-shutoff-under-the-counter/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**