ElectricalToolbox

How to Hang Halloween Lights and Extension Cords Outside Without Nails

Use clips and hooks made for the job, and keep nails and staples away from anything with a wire in it. Plastic light clips, gutter hooks, adhesive outdoor hooks, and cord holders grip a string or a cord without piercing it, which is the whole point: a nail or a staple through the insulation is what turns a decoration into a shock or a fire. Hang the lights, route the extension cord along a wall or a bed rather than across a walkway, keep every plug-to-plug connection up off the wet ground, and make sure the cord itself is outdoor-rated and heavy enough for the load over the distance you are running it. This page covers the support to use on each surface, how to keep the connections dry, and the one place a calculation still matters.

Mounting a cord neatly does not change how much load it can carry. Before you hang a long run, the Extension Cord Voltage Drop Calculator shows whether the gauge you have is heavy enough for the decorations at that distance, or whether you need a thicker cord.

Why nails and staples are the wrong fasteners

A nail or an insulated staple driven over a cord or a light string presses on the insulation, and it does not take much to nick or crush it. Once the outer jacket is broken, the conductor inside is exposed to rain and to your hands. That is a path for a ground fault, a short, or a shock, and a compressed cord also runs hotter at that pinch point than the rest of the run. The damage is easy to miss because the staple hides it, and it does not announce itself until the cord is wet or under load. A cord is portable equipment, not building wire, and fastening it in place with hardware treats it as something it is not.

This is the same reason you do not staple a cord down or tack it to a fascia board. The fix is a fastener that holds the cord without biting into it.

What to use instead, by surface

Match the support to what you are attaching to. None of these pierce the cord or the string, and none put a hole in the house.

  • Gutters and roof edges: plastic S-shaped gutter hooks slip over the lip of the gutter, and shingle tabs slide up under the bottom row of shingles. Both hold a light string at the roofline with nothing driven in.
  • Vinyl or aluminum siding: siding hooks tuck into the seam between courses without a screw. They come off in November without leaving a mark.
  • Doors, posts, railings, and brick: adhesive outdoor hooks rated for the weather and the weight. Follow the temperature range on the package, because a cold, damp surface is where a cheap adhesive lets go.
  • Along the ground and through beds: plastic light stakes for the string, and a raised cord holder or a low garden hook to keep the extension cord off the soaked grass rather than lying in it.
  • Across a path or a driveway: a rubber or plastic cord protector ramp, not tape and not a rug. It keeps feet and tires off the cord without trapping its heat.
  • Bundling slack: reusable hook-and-loop straps, or cable ties left loose enough to slide a finger under. A tie cinched down hard does the same thing a staple does, so keep it snug, not tight.

Keep the connections up and dry

Where two cords join, or where a cord plugs into a decoration, is the part the weather gets into. Do not let that junction sit on the ground in a puddle or under leaves. Hang the connection on a hook a few inches up, or set it on a brick, so water runs away from it instead of pooling around it. A simple trick is a drip loop: let the cord sag into a low U before it reaches the plug, so rain drips off the bottom of the loop and not into the connection.

For a plug left outside for weeks, cover the junction with a weatherproof connector shield or an in-use outlet cover, and put the whole display on a ground-fault (GFCI) outlet. There is more detail in keeping outdoor cord connections dry. Keeping a connection off the ground is also easier when the cord is held up by hooks rather than lying flat where you stapled it.

The cord still has to be sized for the run

Hanging a cord tidily does nothing for the voltage lost along it. A light gauge cord stretched a long way loses enough voltage that the lights at the far end look dim and a motorized prop can struggle. Size it before you hang it.

Say you are running about 5 amps of decorations, roughly 600 watts at 120 volts, out to a display 100 feet away on a thin 16-gauge cord. The voltage drop is:

VD = 2 × 12.9 × 5 A × 100 ft / 2,580 cmil = 5.0 V

VD% = 5.0 / 120 = 4.2%

Voltage at the display = about 115 V

At 4.2 percent that run is past the 3 percent most installers treat as the practical limit. Move up to a 14-gauge cord on the same 100 feet and the drop falls to about 3.1 volts, roughly 2.6 percent, and the voltage at the display climbs back near 117 volts. A heavier cord over a long distance is the fix, and the Extension Cord Voltage Drop Calculator runs your own load and length so you can pick the gauge before you climb the ladder.

Take it down after the season

Holiday lighting is temporary by design. The National Electrical Code (NEC) treats decorative and holiday lighting as temporary wiring and, under Article 590.3(B), allows it to stay up for a limited stretch, not year round. Cords and light strings are not built for a permanent install exposed to sun and weather season after season, so when the decorations come down the cords come down with them. Leaving a cord stapled to the house all year is exactly the kind of long-term exposure it was never rated for.

NEC reference

NEC 2020. Flexible cord is portable equipment and is not permitted as a substitute for the fixed wiring of a structure or run through the building surfaces the code lists in Article 400.12, which is part of why it is fastened with clips rather than driven in like cable. Decorative and holiday lighting is covered as temporary installations under Article 590.3(B). Outdoor outlets at a dwelling require GFCI protection under 210.8(A)(3). The 3 percent voltage-drop figure is an informational recommendation in the notes to 210.19, not a hard code limit, and it is used here as a practical guideline. Watts equal volts times amps is the power relationship, not a code value.

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

For the whole season

The Holiday Electrical Safety Handbook

This guide answers one question. The Handbook covers Halloween through New Year's: how many amps a circuit can really carry (a 15 amp breaker means 12 amps, a 20 means 16), extension cords, GFCI outlets, outdoor displays in the weather, the Thanksgiving kitchen, tree lights, space heaters, and what to do when something goes wrong. Every figure is pre-converted to amps, so you add instead of calculate.

Read on Kindle Paperback on Amazon Free circuit map and load worksheet

Get the next seasonal safety check by email

Optional. Short emails before each holiday, written for homeowners.

Related