Can you plug into an extension cord without damage? Yes, that is what they are for. Just make sure whatever you plug in does not exceed the ratings for the cord.
DON'T plug extensions cords together.
Get one that is the correct length you need. It may be tempting to just string them together, but resist the temptation. Extending the length of an extension cord by “daisy-chaining” can lead to overheating the cord by overloading it, creating a serious fire hazard.
The OSHA regulations and National Electric Code related to these devices is as follows: Extension cords are to be used for only temporary wiring for up to 90 days. An extension cord can be used when it is running directly from the appliance to the wall, but only as temporary wiring.
Using extension cords
Never use indoor extension cords outdoors. Don't plug multiple cords together. Don't run extension cords under rugs or furniture. Never tape extension cords to floors or attach them to surfaces with staples or nails.
Hide them underneath a rug.
Tucking cords underneath a rug is a great, incredibly simple, way to keep them out of sight. We recommend a little bit of electrical tape to keep them running snugly along the floor. And if you have corded items that are too far from the edge of your rug, you can consider cutting a (very!)
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Only plug in an extension cord into a power strip if the power strip has been hard-wired into the electrical system. Otherwise, avoid plugging an extension cord into a power strip. Only plug power strips directly into a wall outlet. Do not plug a power strip into an extension cord or another power strip.
The best solution for keeping the cords of a wall-mounted TV out of sight involves hiding them behind the wall itself using recessed cable plates like the DATA COMM Easy Mount Cable Organizer Kit.
We don't recommend that you put your Sonos or TV power cords behind your wall. It's against code, and for good reason—it's a fire hazard and against National Electrical Code. A regular power cord behind a wall can overheat or get damaged where you can't see it.
Answer: No. Although the application of electrical tape to conductive parts, as described above, will likely reduce worker exposure to the shock hazards of uncovered receptacles, it is not an acceptable alternative to retaining receptacle covers in place or turning off power.
Extension cords are insulated and have no electrical parts to damage with water. However, if water drenches the metal prongs or enters the plug outlet, it could cause a short, a fire, or electrocution for the person who touches it. Never use an indoor extension cord outdoors.
Can I Leave an Extension Cord Outside? Outdoor cords aren't meant to be outdoors indefinitely. They'll see you safely through a party or a weekend project, but after that you'll want to bring them back inside and safely store them until next time.
Third-party approved, SJEOW rated: Any cord marked by UL (“UL Listed”) or Intertek (“ETL Listed”) has been tested to certain safety and function standards by a reputable third party. This ensures that the cord is of reliable quality and can be used safely within its given power rating.
Assuming nominal 110 volts through good quality extensions cords of #12 AWG wire and a moderate load of 5 amps (that should be plenty unless you're your running whole lotta gear and a coffee pot) ,three 100' lengths of extension cord would net you a voltage loss of about 4.75 volts.
Without proper storage, cords become damaged and ineffective over time. One of the most common problems is that the cords “pig-tail” or become curly. This happens for two reasons, one being improper storage. Extension cords, curl up when the user wraps the cord improperly.