Finally figured out why my dryer kept instantly tripping the breaker

I ran into this exact scenario last summer when we moved into a house with a newer Square D panel that had a 30-amp dual-function GFCI breaker for the laundry. In our previous rental with older standard breakers, leaving that jumper on might have let the machine power on without instantly popping the circuit, creating a hidden hazard. But the moment you plug into a modern GFCI-protected setup, that chassis bond bleeds current and kills the circuit on contact. On my Whirlpool, I was tempted to just snip the brass jumper wire completly off to get it out of the way. Instead, I folded it back and secured it under an insulated parking post on the terminal block. That way, if we ever move into an older rental that still has a 10-30R receptacle, the original bonding strap is still intact and ready to go. Good call on the strain relief, too. I used an inexpensive two-screw metal clamp from the hardware store, but I had to be careful not to overtighten it. Those thick 10/4 cords can crush easily if you crank down too hard with an impact driver, wich can cause an internal short against the metal clamp.

I had an instant trip on my Maytag dryer swap a couple of months back, but my issue ended up being purely mechanical rather than the neutral bonding jumper. I was so focused on getting the ground wire separated from the neutral block that I didn't pay enought attention to the clearance on the hot legs. When I torqued the nuts onto the terminal block, the ring lug on the black L1 conductor twisted slightly sideways. Once I screwed the rear metal access plate back on, the metal pressed directly into that lug and created a dead short. Flipped the 30-amp breaker, heard a loud pop, and found a tiny black arc mark on the inside of the cover panel. Now I always hold the ring terminals perfectly straight with a pair of needle-nose pliers while snugging the screws down, and I check the spacing with a flashlight before the cover goes on. Sometimes it's easy to overthink the wiring schematic when the real culprit is just an eighth of an inch of clearance missing inside a cramped terminal box.

Whenever I swap these cords, I'll tape a ziplock bag with the old cord and that jumper right onto the back panel. Done it on my last two moves and it's saved me a ton of hassle when the next place had the older plug. Another trick: stuff a shop rag right under the terminal block before you loosen anything. I've dropped a brass nut down inside the cabinet before and spent an hour fishing around with a magnet so I wouldn't have to pull the whole back off.