Extension Cords and Trouble Lights

Reading an extension cord code before you plug in

Portable light and portable power sit together here, so the cord code comes first. A label such as 12/3 SJTW packs the facts you need. The 12 is the wire gauge, and a lower number is thicker; the 3 is the number of conductors (hot, neutral and ground). In SJTW, S marks hard service, J a 300 V junior-service rating, T a thermoplastic jacket and W outdoor use. Stay within the amp rating on the label, use a heavier gauge for power tools and long runs, and note that triple-tap cords share the same total load across all three outlets.

Work lights: lumens, power source and weather rating

Lumens measure light output, while watts only show power draw, so compare lumens. LED and COB (chip-on-board) lamps give far more light per watt than incandescent bulbs and run cooler. A corded light gives steady brightness for long jobs. Cordless ones run on rechargeable packs or AA cells, so check the runtime at the brightness you will use and whether the battery and charger are included. For wet or dusty work, look for an IP rating such as IP66, which covers dust and strong water jets, and a flood or spot beam suited to the task.

Questions about Extension Cords and Trouble Lights

How long can an extension cord be before it causes problems?

Longer cords lose more voltage, so tools run hot and weak. Keep the cord as short as practical and step up to a heavier gauge, such as 12 AWG, for heavy loads or runs beyond about 50 feet. Uncoil it fully, because a bundled cord traps heat.

Can I use an indoor extension cord outside?

No. Indoor cords have lighter insulation that is not rated for wet locations or sunlight. Choose a cord marked for outdoor use, such as one with W in its jacket code, and keep plugs and connections off wet ground and out of standing water.

How many lumens does a work light need?

A few hundred lumens is enough for close bench or under-hood work. Lighting a garage bay or a yard takes several thousand. Beam shape matters too: a flood spreads light over a wide area, while a spot throws it a long way.