Warehouse Power in Palm Beach County: What 3-Phase Means and How to Check a Space Before You Sign
Power is the warehouse spec tenants most often forget to ask about, and it is the one that is hardest to fix after you move in. You can work around a slightly smaller footprint or one fewer door. You cannot run a 25-horsepower air compressor, a CNC router or a large walk-in cooler on a service that was never built for it. This guide explains what "3-phase" actually means, how Florida Power & Light (FPL) decides which service a building gets, and exactly what to check on a Palm Beach County tour so the space you lease can run the equipment you own.
Single-Phase vs. 3-Phase in Plain English
Single-phase power is what a house has: one alternating voltage that rises and falls 60 times a second. It runs lights, outlets, computers, small tools and most small air-conditioning units without any trouble.
Three-phase power delivers three alternating voltages, offset from each other, on separate conductors. Because the peaks overlap, the total power delivered stays nearly constant instead of pulsing. An engineering course on three-phase circuits from PDHonline illustrates the difference: single-phase power swings through zero every cycle, while a balanced three-phase load draws power at a steady rate. For a business, that means larger motors start more smoothly, run cooler and can use smaller wiring for the same work.
You will usually see 3-phase described with two numbers, such as 120/208V or 277/480V. The lower number is what a single circuit delivers to ordinary outlets and lighting; the higher number is the line-to-line voltage your 3-phase equipment uses.
Who Actually Needs 3-Phase
Plenty of warehouse tenants do not. A contractor storing materials, an e-commerce seller packing boxes or a distributor running a pallet jack and a few computers is typically fine on single-phase service.
You likely need 3-phase if your operation includes:
- Air compressors of 7.5 horsepower and up (FPL's threshold, explained below)
- CNC routers, mills, lathes or other production machinery
- Commercial refrigeration, walk-in coolers or freezers
- Large rooftop or split HVAC systems for a conditioned warehouse
- Dust collection, industrial fans or conveyor systems
- Multiple electric forklift chargers running at once
The best source of truth is the nameplate on each piece of equipment. Write down the horsepower (or kW), voltage and phase for everything you plan to plug in, and bring that list to every tour.
How FPL Decides What Service a Building Gets
Most of Palm Beach County is served by FPL, and FPL's Electric Service Standards spell out the rules in more detail than most tenants realize. The motor section is the useful part:
| Your largest motor | What FPL's standards call for |
|---|---|
| Under 7.5 hp | Single-phase is acceptable, unless 3-phase is already supplied |
| 7.5 to 20 hp | 3-phase, 120/240V four-wire open delta (or wye if already supplied) |
| Over 20 hp | 3-phase wye service (120/208V or 277/480V) |
Source: FPL Electric Service Standards, Section IX (Motors, Controllers and Air Conditioners).
The same document notes that 3-phase is "provided where available," that FPL should be consulted before ordering or installing any large motor, and that devices to convert single-phase to 3-phase are available for a wide range of motors. FPL's general rules tariff adds that when new facilities are needed to extend service, the company may require a contribution in aid of construction. FPL's planning guide is more direct: when a customer asks for 3-phase where single-phase would typically be provided, the customer pays the cost difference. In practice, a power upgrade can carry a utility cost on top of your electrician's bill.
One local exception: the City of Lake Worth Beach runs its own electric utility, serving the city and some surrounding areas. If you are looking at space in or near Lake Worth, confirm which utility serves the building before you assume FPL's rules apply.
120/208V vs. 277/480V: Why the Voltage Matters
Three-phase is not one thing. The voltage has to match your equipment. FPL's Service Planning Quick Reference Guide on standard voltages (filed with the Florida Public Service Commission) describes the three options this way:
- 120/240V open delta is the standard where a building mixes large single-phase loads with small 3-phase loads. The guide notes its growth capability and its ability to start large motors are limited.
- 120/208V wye is preferred for balanced loads where there is a combination of single-phase and 3-phase equipment. That mix is why it often shows up in multi-tenant flex and office/warehouse buildings.
- 277/480V wye is preferred for large 3-phase loads and is described as usually essential for starting large motors and delivering large amounts of power.
The mismatch to watch for is equipment rated for 230V or 240V going into a 208V building. FPL's own guide tells its planners to advise customers to check equipment for proper operation on 208 volts. Ask your equipment supplier or electrician to confirm the nameplate voltage range before you sign, not after the machine arrives.
Amps: The Number That Tells You How Much You Can Run
Phase tells you what kind of power a space has. Amperage tells you how much. A space with 3-phase service but a small main breaker may still be too light for your operation.
For a 3-phase service, a quick estimate of capacity is:
kVA = volts × amps × 1.732 ÷ 1,000
| Service | Approximate capacity |
|---|---|
| 200 amps at 208V, 3-phase | about 72 kVA |
| 400 amps at 208V, 3-phase | about 144 kVA |
| 200 amps at 480V, 3-phase | about 166 kVA |
These are ceiling numbers, not what you can safely load continuously. Your electrician will size the actual load, but the table gives you a fast way to compare two spaces that both claim "3-phase."
How to Verify Power on a Tour
Listings often say "3-phase" or nothing at all. Do not rely on either. On the tour:
- Find the meter and main disconnect. Photograph the meter and the label on the main disconnect. The label usually lists voltage, phase and amperage.
- Look at the panel schedule. Three-phase panels have three-pole breakers (three switches tied together). Photograph the schedule so your electrician can review it.
- Ask whether the unit is separately metered. In multi-tenant buildings, confirm your unit has its own meter and its own panel, not a share of a neighbor's.
- Ask what the last tenant ran. A former machine shop or cold storage user is a good sign. A former office or storage tenant tells you very little.
- Do not open panels yourself. Ask the landlord or listing agent to have the panel cover removed, or bring a licensed electrician to a second showing.
Then request the information in writing. A short email asking the landlord to confirm voltage, phase and amperage for the specific unit is reasonable, and the answer belongs in your file before you send a letter of intent.
What If the Space You Like Doesn't Have It?
You have three realistic options:
- Phase conversion. Rotary phase converters and variable frequency drives can run some 3-phase motors on single-phase service. FPL's standards acknowledge these devices. They work best for a small number of machines and are not a substitute for a real service when the load is large.
- A service upgrade. This involves a licensed electrical contractor (Florida regulates electrical contracting under Chapter 489, Part II, Florida Statutes), a permit from the county or city building department, and coordination with the utility. The Florida Building Code, Chapter 27, makes NFPA 70 (the National Electrical Code) the governing standard for that work. Timing depends on the scope and on the utility, so get an electrician's estimate before you commit.
- Keep looking. Sometimes the cheapest path is a different building.
If an upgrade is part of the deal, it should be addressed in your letter of intent and lease: who pays for what, who manages the work and what happens if it isn't done by your move-in date. Have your attorney review that language. Our guide to tenant improvements and TI allowances covers how build-out work is typically negotiated, and the step-by-step leasing guide shows where it fits in the timeline.
Why This Matters More in Palm Beach County Right Now
Palm Beach County's industrial market is running as two markets. According to CBRE's Q3 2026 Palm Beach Industrial Figures, buildings completed before 2000 make up 70% of the county's inventory and sit at just 3.7% vacancy, while product delivered since 2020 is 31.1% vacant. Overall vacancy was 9.1% in the quarter.
That split has a practical consequence. Most affordable small-bay space is in older buildings, and older buildings were wired for whatever their first tenants needed. Some have plenty of power; some were built for storage. Because that older space leases quickly, you rarely have time to research power after you find a unit you like. Put voltage, phase and amperage on your requirements list from the first call.
Start Your Search With Power on the List
Our warehouse space hub groups current availability by what tenants search for, including office/warehouse space, warehouses with roll-up and overhead doors, 2,500 to 5,000 SF warehouse space and 5,000 to 10,000 SF warehouse space. Pair this guide with our explainers on clear height and loading docks to cover the three specs that most often rule a space out. You can also browse by city, starting with West Palm Beach and Riviera Beach.
FAQ
Do warehouse listings say whether a space has 3-phase power? Sometimes. When a listing mentions it, treat it as a starting point and confirm the voltage, phase and amperage for the specific unit in writing.
Can I run 3-phase equipment on single-phase power? Some motors can run through a phase converter or a variable frequency drive. It is workable for a few machines, but it adds cost and is not a fit for heavy or production loads. Ask an electrician to evaluate your specific equipment.
Who pays to upgrade a warehouse's electrical service? It is negotiated. Depending on the deal, a landlord may contribute through a tenant improvement allowance, the tenant may pay, or the cost may be shared. Settle it in the letter of intent and have your attorney review the lease language.
Is 3-phase power more expensive to use? Your bill is driven by how much electricity you use and how much you draw at peak, under your utility's commercial rate schedules, rather than by the phase itself. Heavier equipment uses more power regardless of how it is fed.
What's the difference between 208V and 480V? Both are 3-phase. 120/208V is common in multi-tenant flex buildings and works for moderate loads. 277/480V supports larger motors and heavier loads and is typical in larger industrial buildings. Your equipment's nameplate voltage determines which one you need.
Zach Vorsteg is a Florida real estate sales associate (License SL3603483) with Cornerstone Realty, not a broker. This article is general information, not electrical, engineering or legal advice. Confirm power specifications with a licensed electrician and the serving utility.
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