A third-generation family-owned garage in Ankeny called us about upgrading their oldest bay with a new car lift, and the technical conversation quickly turned to electrical service. Their existing panel dated to the mid-1990s, and the incoming service was 100-amp single-phase — enough for their old lift, but marginal for a modern two-post plus the welding, plasma, and compressor loads they run during restoration work. This article is the deep-dive we walked them through: circuit requirements, phase choices, amp draw, wire gauge, and slab specs for their bay. If you are running an older family garage and eyeing a new car lift install, this same framework will save you a callback and a costly electrician trip.
Every product page shows amp draw, phase, and wire gauge so your electrician has what they need before day one.
Three Generations Under One Ankeny Roof
The Ankeny shop has been in the same family since 1972 — grandfather, father, and now the third-generation son running the day-to-day. The building is 60 by 40 with three bays, and the middle bay holds the shop’s original 1990s two-post lift that had reached end of service life. The restoration side of the business had grown steadily, and the aging lift was slowing down every project involving frame work, rocker replacement, or floor pan welding. The son called us in early spring after his grandfather retired and left him with the equipment upgrade decision.
Our first site visit was on a Tuesday morning with the grandfather and grandson both present. Three generations of shop knowledge in one room made for a great conversation about how the building had evolved, what electrical circuits had been added over the decades, and where the weak points were. The slab under the middle bay was original 1972 pour — a 4-inch pad over a granular base with no visible cracking or spalling. That was our first data point. The second was the electrical panel: a 100-amp Cutler-Hammer with almost every slot occupied, dating to a mid-1990s upgrade from a 60-amp fuse box.
Restoration Work Demands Around a Car Lift
Restoration work stacks demands on a car lift beyond routine service. A restoration job on a 1970s pickup involves plasma cutting, MIG welding, media blasting, undercoating, and sometimes hydraulic pressing — all with the vehicle raised for hours or days at a time. The lift needs to hold position under partial load without drift, needs to allow full-body access without arm interference, and needs to survive stray sparks, slag, and blast media without cable or hose damage. That is a demanding operating envelope compared to a general-service lift.
For this family shop, the primary restoration workload was steel body panel replacement on classic trucks and cars — an average of two to three full restorations per year plus 15 to 20 partial rocker and floor-pan jobs. The recommended car lift was a 10,000-pound Rotary clear-floor two-post with three-stage asymmetric front arms and dual-stage rear arms. The clear-floor configuration is essential for restoration because the floor between the columns has to be free of any obstruction — no cable trays, no hydraulic lines, no crossbars. A base-plate two-post design is fine for general service but fights the workflow on any restoration bay. That was our first structural recommendation.
220V Single-Phase Versus Three-Phase Circuit Choices
Almost every two-post car lift in the light-commercial range runs on 220V single-phase power. That is the standard residential and small-shop service in North America, and the motors used in modern 10K and 12K lifts are designed to run efficiently on that supply. Three-phase 208V or 480V is available on some commercial models — and worth it if your shop already has three-phase service — but for a family garage that has grown up on single-phase, there is no advantage to upgrading the incoming service just for the lift.
The tradeoff between single-phase and three-phase is starting torque and long-term motor efficiency. Three-phase motors start smoother and run cooler at heavy cycling loads, which extends motor life on high-volume shops. Single-phase motors are simpler, cheaper to service, and easier to source parts for at any local electrical supply. For a family garage cycling the lift 4 to 8 times per day, single-phase 220V is the right pick. The Ankeny shop stayed on single-phase and simply added a dedicated 30-amp double-pole breaker for the new lift. Total electrical scope for the install was one new breaker, one new run of 10-gauge THHN wire, and a disconnect within six feet of the motor housing per code.
Amp Draw, Breaker Sizing, and Wire Gauge
Amp draw on a 2-horsepower 220V single-phase lift motor is roughly 12 amps continuous during a lift cycle and 15 to 18 amps briefly at startup. Code sizing on the breaker rounds that up to a 30-amp double-pole — the standard specification for every 2 HP two-post we sell. A 20-amp breaker will nuisance-trip on startup and is not code-compliant for continuous motor loads at that amp draw. A 40-amp breaker is oversized and does not provide the correct overcurrent protection.
Wire gauge for a 30-amp 220V circuit is 10 AWG THHN copper for runs up to about 100 feet from panel to motor. For longer runs, voltage drop calculations dictate 8 AWG to keep the motor within 3 percent of rated voltage under load. On the Ankeny install, the panel-to-lift run was 42 feet, and 10 AWG was correct. The electrician pulled the new circuit, installed a disconnect switch within four feet of the motor, and wired the motor terminal box to manufacturer specification. Total electrical labor was about three hours plus permit and inspection. That is the standard electrical scope for a first-time car lift install in a shop that already has adequate service capacity. See our install guide for the full checklist.
Sub-Panel and Disconnect Requirements
When existing panel capacity is not adequate for a new lift plus expanding loads, the correct approach is a sub-panel dedicated to the lift bay. A sub-panel isolates the lift and any nearby high-load equipment from the rest of the shop, provides a clean disconnect for maintenance, and gives room for future additions like a plasma cutter, a heavy-duty compressor, or a second lift. For the Ankeny shop, we walked through the sub-panel option because their main panel was already tight.
They ultimately did not need a full sub-panel because the previous 30-amp lift circuit was still viable and could be reused for the new car lift. But we sketched out the sub-panel design anyway as a future-planning document — a 60-amp feed from the main panel, a dedicated 30-amp for the lift motor, a 30-amp for a plasma cutter, and two 20-amp general-purpose branches. That design would carry them another twenty years without hitting capacity. Disconnect switches within six feet of the lift motor are code required per NEC 430.102, and every lift install we do includes that disconnect as standard scope. Do not skip it. That single switch is what lets a tech safely service the lift without walking to the main panel to kill power.
Concrete Slab and Anchor Considerations
The Ankeny slab was 1972 vintage and untested, which is a common situation on any family shop that has been running for decades. A four-inch pad over granular fill is the minimum spec for a 10,000-pound two-post, and a slab that old could easily have weak spots from freeze-thaw cycling, water intrusion, or original pour inconsistencies. We ran a rebar scan across the intended anchor pattern and a hammer-drill test at each anchor location. The scan showed no rebar or wire mesh — a common 1970s pour with no reinforcement — but the drill test came back solid across all ten anchor points.
For an unreinforced slab, we always use epoxy-set threaded rod anchors rather than mechanical wedge anchors. Epoxy anchors distribute pullout load across a larger surface area of the concrete and are the safe choice on old or unreinforced pours. Embedment depth was 4.5 inches on 5/8-inch anchor rod, with Hilti HIT-HY 200 epoxy per manufacturer spec. Cure time was 24 hours before we torqued the base plates, and the lift went into service two days after the drill day. That is our standard process on any pre-1990 slab, and it is what separates a lift install that lasts twenty years from one that pulls an anchor at year five.
What This Family Shop Wired the First Time
Twelve months after install, the Ankeny shop is running the new car lift about six cycles per day between restoration projects and routine service. The electrical scope has held up perfectly — no nuisance trips, no motor issues, no voltage drop. The sub-panel we sketched as a future-planning document has not yet been installed, but the son mentioned it is on the list for next year when they add a plasma table. Total upfront electrical cost was about 15 percent of the total install package, and the equivalent cost to add the full sub-panel later would be roughly the same as doing it during original install — but with the disruption of a second electrician visit.
The lesson we always share with family shops looking at their first modern car lift is this: spec the electrical for where you want to be in five years, not where you are today. An extra investment in electrical scope during original install saves you two to three times that in return-visit labor down the road. If you are running a shop with a panel that dates back a generation or two and looking at a serious lift upgrade, our line is 800-674-9302 and we will walk your electrician through the plan free of charge before the first anchor is drilled.
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