AFAIK, 6' max with FMC. Am I correct in that it's 20Amps max. I live in BX land.....all that we use is bx to the panel. If I plan to run FMC for a particular run, do they make it with the intergrated bonding strip ?

First off, fair warning that I am a very "newbie" homeowner and did a couple of very stupid things...:wall: So here's what happened...I was trying to remove a light switch (it was an extra one in the basement and I needed to put a piece of art over it and the switch was in the way) but did NOT turn off the breaker before working (VERY DUMB I KNOW). Of course, while moving around the switch, wires must have touched and sparks flew and tripped the breaker. Now, I mentioned this switch was an extra one...the 'primary' one is at the entrance to the basement and is a Lutron dimmer switch. After I turned the breaker back on, the primary dimmer switch no longer worked. I think I blew that dimmer switch so got a replacement. This dimmer switch is in the middle with another dimmer switch to its left and a regular switch to its right that control different lights obviously. So I went to turn the breakers off for those switches but could not find the one for the 'regular' switch on the right. The basement panel is a sub-panel and the main panel is on the main floor of the house. Once again, my stupidity and impatience took the better of me and I decided to work on replacing the dimmer switch with only 2 of the 3 breakers turned off (so only the right 'regular' light switch was 'hot'). Of course, while replacing the dimmer switch I blew, sparks flew once again for the light switch on the right. The replaced dimmer switch works great but I think I did more damage than just tripping the breaker for the light switch on the right. I checked the main panel and none of the breakers were tripped so I believe I blew the circuit breaker? I went through EVERY switch and turned them off and back on just to be sure but still nothing. I also discovered the lights on a couple of the rooms upstairs are affected too. So after doing some research here, I turned on everything in the house and went through one-by-one on the main panel to narrow down which circuit breaker I may have blown...and I've really only narrowed it down to 1 but the previous (or original owner) labeled it "INTA-HOT" which makes no sense to me. So here are my questions before I go removing the panel to replace this breaker (once again, I'm a complete newbie here so forgive me in advance if any of these questions are completely idiotic...I think I've already proven how dumb I am when it comes to electricals): 1. Is there any possibility a breaker works for some things but not others? 2. Based on the sequence of events, is there something else that could be the issue? Thanks for any help you can lend, :wall::wall::wall: