Extension #15 20A Heavy Duty Extension cord with 5-20 right angle plug to armored 5-20 outlet – 10 gauge Super Flex rubber cable Cheap Sale 2025 New

Black NEMA 5-20 extension cord

Extend your 3-prong 20amp 120volt outlet to where you need it! Works well where you need a little more length to plug in your 20A EVSE or Appliance. This extension features a right angle plug (ground pin up) for tight places and to prevent the weight of the cable from tipping the plug down away from the outlet. At longer lengths voltage drop can be an issue so we are now offering Heavy Duty custom extension cords built with one size heavier cable. This extension is constructed of heavy 20amp 10 gauge cable to minimize voltage drop. Custom built with the best parts and oversized super flexible power cable you will not find a mass produced extension cable of this quality! 

This is a 20amp cable for 16amp continuous or lower load following the NEC’s 80% rule of thumb. Constructed using my Super Flex black rubber cord.

Need some help identifying your wall outlet? We can help! Below is a description of the more common NEMA outlets and their numbers as well as some handy NEMA plug charts. You can also email us a pic of your plugs and outlets you need help identifying and we would be happy to help.

Here are the more common NEMA outlets:

• 5-15 standard 15A 120 volt household outlet, the most common you see everywhere.
• 5-20 standard 20A 120 volt household outlet, required by code in bathroom and behind your refrigerator.
• 6-15 standard 15A 240 volt household outlet, found in homes and motels for running in-wall Air Conditioners, it’s the smaller brother to the NEMA 6-20 outlet. The 5-20 is not as common as a 6-20 outlet with it’s “T” shaped slot as it will accept both 6-20 and 6-15 plugs.
• 6-20 standard 20A 240 volt household outlet, found in homes and motels for running in-wall Air Conditioners, also found occasionally in residential garages.
• 6-30 standard 30A 240 volt 3-prong outlet, found in shops and garages used for medium size welders.
• 6-50 standard 50A 240 volt 3-prong outlet, found in shops and garages used for large welders.
• 10-30 standard 30A 240 volt 3-prong Dryer outlet found in homes build before 1996, replaced by 14-30 in 1996.
• 14-30 standard 30A 240 volt 4-prong Dryer outlet found in homes build in 1996 and newer
• 14-50 standard 50A 240 volt 4-prong Range (electric stove top) outlet, also called RV-50 at the RV parks. By far the best universal connector to have for an EVSE. This is the one the Tesla guys install in their garages.
• 10-50 OLD 50A 240 volt 3-prong Range (electric stove top) outlet, also found in old shops used for large welders, replaced by 14-50
• TT-30 (Travel Trailer 30amp) 30A 120 volt 3-prong outlet, the older style found in RV parks, not used in residential homes.
• L6-30 (locking 240 volt 30amp) Twist-Lock 30A 240 volt outlet, my personal favorite locking connector, easy to find in stores, works great for adding adapters to portables EVSE’s equipped with a L6-30 plug. Commonly used for CPU server racks and PDU’s

220/240 volt outlets are commonly installed with the ground pin towards the ceiling for safety. 110/120 volt outlets can be found mounted in all directions. Be sure to carefully look at your outlet and the chart, it’s easy to mistake one outlet for another if your outlet has it’s ground pin facing the floor instead of the ceiling or Vice Versa compared to the chart.

In the full NEMA number you will see a capital R or P. The R stands for Receptacle (outlet) and the P stands for Plug, we commonly truncate this to just the numbers and add the word receptacle (or outlet) at the end. For example 14-50R becomes 14-50 receptacle or 14-50 outlet.

Need some extra length between your wall outlet and Power Spy™ or between the Power Spy™ and your computer rack? I custom build extension cords to the length your need and with the plug and outlet of your choice, see my extensions in the Adapter’s section for several models; Extension Cords

Email me with your custom request.