50 ft. 12 Red Stranded CU THHN Wire

Yes, this wire is made from stranded copper with flame-retardant PVC insulation and nylon jacket.

This spool weighs approximately 12 pounds.

This is red stranded THHN.

This is dual rated THWN

Approximately 152.4 meters. The above advice is based upon the current edition of the National Electric Code (NEC). Free access to the latest version of the NEC is available online at www.nfpa.org/freeaccess. The NEC and local building codes regulate the types of wire and cable that can be used in specific electrical applications, as well as the manner of installation. Check your local building codes before you start any wiring and cable electrical project and be sure to obtain required permits. When your work is complete, always have it inspected for compliance with local codes to ensure that it has been safely installed.

Yes, this can be done when properly identifying the 2nd neutral. If these circuits are in conduit, you will need to make sure they don't exceed the maximum conduit fill. The above advice is based upon the current edition of the National Electric Code (NEC). Free access to the latest version of the NEC is available online at www.nfpa.org/freeaccess. The NEC and local building codes regulate the types of wire and cable that can be used in specific electrical applications, as well as the manner of installation. Check your local building codes before you start any wiring and cable electrical project and be sure to obtain required permits. When your work is complete, always have it inspected for compliance with local codes to ensure that it has been safely installed.

The max tension on a 12 AWG Cu conductor is 52 lbs

No, this is a single conductor wire used in conduit with other conductors. You need to install a ground wire (green) or replace the branch wiring in your home with proper Romax grounded cable and make sure your service (meter) is properly grounded with a driven ground rod and a cold water pipe connection too. I advise you use a licensed electrician to do the work. Also if your home insurance company finds out you don't have adequate electrical wiring, they could cancel your insurance or deny a claim should one arise.

I made up a mock order and selected 3 different colors and the bill showed no discount. I then deleted 2 of the colors and changed the order to show 3 of the same color and the bill then showed a discount. So if this little test is correct, it looks like you need to buy a multiple of three of the same color.

only if you use it in conduit rated for exterior and don't forget the waterproof connections at each end and joint