Buy a longer cord instead of daisy-chaining

You can connect two extension cords end-to-end, but it’s not the safest way to reach farther.

The issue isn’t that it’s illegal or that your house will immediately burn down. It’s that you’re introducing two points of failure instead of one. Each connection is a place where resistance can build up, heat can build up, or someone can trip. And if the cords are different gauges (the thickness of the copper inside), the thinner one can overheat because the load pulls more current than it’s rated for.

If you absolutely have to daisy-chain, follow these rules: both cords must be the same gauge (12 or 14 AWG for typical heavy-duty, not the thin 16 AWG lamp cord), both must be fully uncoiled, and the connection should be off the ground and not under a rug. Never plug a 16-gauge cord into a 12-gauge cord and expect it to handle a space