I use this cord for some load balancing in my circa 1970's flat. The outlet nearest the master bedroom window shares the circuit with another bedroom, making it impractical to have A/C in both rooms without an extension cord. Most airconditioners have a warning not to use extension cords due to the voltage drop across thinner (larger gauge) wire. This extension cord is definitely over specced, resulting in almost no voltage loss even when pulling full current. Plus its heavy enough to use as a medieval weapon in case of home intrusion - I think the 50' weighs around 25 lbs. So far using this cord plugged in close to where my breaker is, I see far less voltage drop when the A/C starts up - I suspect that it is significantly better than the romex in the walls. Another nifty feature is the heavy duty construction (its about 3/4" on the outer diameter) allows you to almost mold it in place and have it stick. We have it routed over our bedroom door jamb and don't need to use cable ties or cable guides to hold it in place - its heavy enough and resistant enough to bending that it just stays in place. Works great for our purpose (A/C extension cord)