I've been researching why it's generally advised against using extension cords for indoor sump pumps. My old sump pump is quite outdated, and the float switch is broken, which requires me to manually pull the lever to activate it. The existing pump has a long electrical cord (about 20 feet) connected to an outlet that I share with my washer. I want to replace this sump pump but keep the old one as a backup. The problem is that I can't find a replacement pump with a long enough cord, and I keep hearing warnings against using extension cords. I'm curious about why that is, and under what circumstances it might be acceptable. My sump pit is sealed due to a Radon system, so there's no risk of any plug ending up in water. I'm open to using a heavy-duty extension cord, but I'm concerned about safety and fire hazards. Could someone help clarify this for me?
3 Answers
While extension cords are indeed discouraged for permanent setups due to safety codes, if you use a suitably thick cord and keep it dry, you might make it work. My sump pump is actually plugged into a heavy-duty power strip that's elevated from the floor, which helps keep it safe. Just keep in mind it’s best to fix the issue properly when you can.
You're correct that many installations use a cord wired directly from the pump. The reasoning behind the extension cord restriction is mainly about safety and code compliance for permanent installations. Sump pumps operate in wet areas and can pull a lot of power, so using an extension can create risks if you're not careful. The best long-term solution is to get an outlet installed closer to your pump or to rewire the pump with a longer cord.
The main reason they advise against using extension cords with sump pumps is because these pumps can draw significant power. Using a cheap, lamp-style extension cord can be very risky. If you choose a heavy-duty extension cord, say a 25-foot 14-gauge, that should work fine. Just remember, though, it's technically against electrical code to use extension cords as a permanent solution, so be sure to plan on making a proper fix eventually.