ElectricalToolbox

Can You Plug a Fog Machine Into a Power Strip?

A fog machine can physically plug into a power strip, and for one small fogger indoors on its own it will usually work. But it is a poor idea for most Halloween setups, and here is the honest reason: a fog machine is one of the biggest loads in the yard. A 1,200-watt unit pulls 10 amps, and a typical power strip is rated for only 15 amps total. The fogger alone eats two-thirds of the strip, so anything else you plug in beside it risks overloading it. Add the fact that ordinary power strips are indoor-only and that daisy-chaining them is a known fire cause, and the fogger belongs on a proper outdoor-rated cord straight to a GFCI outlet, not on a strip.

Before you decide where the fogger goes, size the cord that feeds it. A high-draw load on a long, thin cord loses voltage and heats up. Run the gauge, length, and amps through the Extension Cord Voltage Drop Calculator first.

The load math on a power strip

A common household power strip is rated 15 amps, which at 120 volts is 1,875 watts, and it protects itself with a small 15-amp breaker built into the switch. The rating stamped on your strip governs; read it. Now put a fog machine against it. Foggers are sold by heater wattage, and amps are just watts divided by 120:

1,000 W ÷ 120 V ≈ 8.3 A

1,200 W ÷ 120 V = 10.0 A

Strip rating: 15 A total

A single 1,200-watt fogger leaves about 5 amps of the strip's 15 for everything else. That sounds like room until you remember a fogger is rarely alone on the strip; the whole point of a strip is to run several things. Plug a second 700-watt fogger into the same strip and you are at 10 plus 5.8, which is 15.8 amps, past the strip's own breaker, so it trips, or worse, an old or cheap strip without a working breaker just overheats. Even staying under the trip point, the strip's feed cord is usually thin 16-gauge wire, thinner than the heavy cord a fogger should have, and it runs warm carrying 10 amps for an evening.

The heater cycling hides the load

A fog machine does not draw steadily. Its heater warms a block, a thermostat cuts it, and it switches back on when the block cools. When the heater is on it pulls the full 8 or 10 amps; between cycles it draws almost nothing. People watch the fog stop and think the machine is idle, so they load up the rest of the strip, then the breaker trips the instant the heater kicks back on at the same time everything else is running. On a cold Halloween night the machine reheats constantly to keep making fog, so treat it as if the heater were on the whole time and count its full nameplate amps against the strip, not an average.

Never daisy-chain strips

Plugging one power strip into another to reach farther or get more outlets is called daisy-chaining, and it is specifically against the instructions printed on the strip, against workplace safety rules, and a well-documented cause of fires. Each strip in the chain still carries the whole load through its own thin cord and its own 15-amp breaker, but now two of them are stacked, and the wall outlet behind them sees the sum with none of the strips aware of the others. A fog machine, being a heavy load, is the worst thing to run through a chain like that. One strip, plugged straight into the wall, is the only correct way to use one.

A strip is indoor equipment

There is a second problem outdoors: an ordinary power strip is listed for indoor, dry locations only. Its outlets are open, its breaker is not sealed, and it is not built to get rained on or sit on wet grass, which is where a Halloween fogger lives. Setting a strip outside to feed the yard invites both a shock hazard and nuisance trips of the outdoor GFCI the strip is plugged into. If you need to split power out in the yard, run one heavy outdoor-rated cord to the spot and use an outdoor-rated outlet box or an in-use covered receptacle, not an indoor strip. The companion guide on power strips outside for Halloween lights covers the outdoor-listing issue in full.

The safer setup

Give the fogger its own outdoor-rated extension cord, sized thick and kept short, running straight from a GFCI-protected outdoor outlet to the machine, with the plug connection elevated and under an in-use cover. No strip, no chain, nothing else sharing that cord. A high draw over a long thin cord loses voltage and heats the wire, so a heavy 12-gauge cord beats a thin 16-gauge one for a fogger every time. Add up the rest of the display separately and keep the whole circuit under 12 amps, since a 15-amp branch circuit is held to 80 percent for an all-evening load. Run the cord to the fogger through the Extension Cord Voltage Drop Calculator to confirm the gauge holds voltage over the distance.

The short version

  • A fogger fits but usually shouldn't. A 10-amp fogger leaves only about 5 amps of a 15-amp strip for everything else.
  • Two foggers trip the strip. 10 A plus 5.8 A is 15.8 amps, past the strip's own 15-amp breaker.
  • The heater cycling hides the load. Count the full nameplate amps, not the quiet moments between cycles.
  • Never chain strips. Daisy-chaining is against the instructions and a documented fire cause.
  • Give the fogger its own outdoor cord. Thick, short, straight to a GFCI outlet, not through an indoor strip.

NEC reference

NEC 2020. A power strip is a relocatable power tap, listed under a product standard for indoor use and not intended as permanent wiring; the NEC in 400.8 does not allow flexible cord and cord-connected taps to substitute for the fixed wiring of a structure. The 80 percent ceiling for a continuous load, one running three hours or more per the Article 100 definition, comes from NEC 210.20(A) and 210.19(A), which sets the 12-amp working budget on a 15-amp circuit. Outdoor receptacles at a dwelling must be GFCI protected under NEC 210.8(A), and a receptacle in a wet location must keep its cover closed over a plugged-in cord under NEC 406.9(B)(1). The 15-amp and 1,875-watt strip ratings and the fog machine wattages are typical 2025 product figures, not code values; the rating stamped on your equipment governs, and watts equal volts times amps is the power relationship, not a code figure.

Results are for reference only. Verify against the applicable adopted edition of the NEC and consult a licensed electrician for code compliance.

Get the full guide

NEC Code Quickstart

This guide covers one calculation. NEC Code Quickstart walks all twelve exam calculations start to finish, each with a worked example and the exact code reference: ampacity and derating, breaker sizing, voltage drop, box and conduit fill, grounding, dwelling load, range and dryer demand, motor circuits, and transformer current. Written for the 2023 NEC with notes for the 2026 edition.

Read on Kindle Paperback on Amazon

Related