Unless the wire has AWG printed on it, you might have a chance of stuffing 0000 wire in a red connector. Stranded wire MUST be larger in diameter than solid wire. Conductor-wise.
THE FOLLOWING POINT IS THE POINT OF ISSUE
Circuits are calculated and designed by planning not guesswork. A circuit can range anywhere in size from digital which are wave soldered to power generation circuits that use conductors the size of your forearm.
When you go to the store with a grocery list and the recipe calls for 12 ounces drained weight of peas, you buy a can of peas, go home and find out after draining you have 5 ounces of peas, are you a happy camper? If you pay two hundred dollars to get a load range E tire with a 3,300 lb rating and then find out the tire really has a 2,600 lb rating, are you a happy camper? Women may love using a bathroom scale that reads 118 lbs rather than 140 but I do not get tickled to death being cheated. I don't like paying top dollar and then have to use expensive lab equipment to be sure that my designed exactly correct circuit isn't going to go up in flames.
I tried every butt connector DESIGN I own. Twelve gauge, some insulated blue and some not. I tried to fit NUMBER TWELVE AMERICAN WIRE GAUGE WIRE into these terminals. Not one went in. Strands flayed out. These are mostly Del City terminals. The few PLASTIC garbage terminals I feel came from Harbor Fright were WORSE NOT BETTER. More strand flaying.
Our little Oriental buddy's are into a new trick. Screw SAE or AWG and mark wires in millimeters.
But I am a staunch consumer advocate. No three walnut shells and a pea purchases for me. No .125" plate equivalent-amp-hour batteries that miraculously weigh ten percent lighter. No newfangled "Amp Seconds" battery label ratings. No "Contents May Settle Up To 90% During Shipment" oversize boxes. "No same-price only 9% less product in the same bottle" prestidigitation.
YOU AIN'T GONNA FIT GENUINE TWELVE AWG WIRE INTO A BLUE INSULATED CONNECTOR.
"Although Table 8 in Chapter 9 states that #12 solid and #12 stranded have the same Circular Mill Area, it seems to indicate that the overall diameter of #12 solid is 0.081 inches and #12 stranded is 0.092 inches. Wouldn’t that actually make it just a tad larger than the #12 solid overall?"
take 'em to the library and they eat the books"
