I'm in the process of replacing my breaker panel. I was talking to my neighbor and she said that her panel was changed when she did some remodeling. I was interested to see what was installed in her condo because we have a limited width (11in) space for the panel. Here is a picture of her panel (the one with the 30A breaker) and mine (the one with the 40A breaker). It looks like all of her breakers (except for the 30A) are tandem (Type MH-T on the labels). The installation was done by a certified electrician and inspected/approved by the city. I have two multi-branch circuits in my condo. You can see breakers 4 and 5 linked with a piece of metal. Breakers 2 and 3 are also multi-branch but the metal link is missing. Her condo is like mine so she should also have two multi-branch circuits. So ... how did the electrician do that with the tandem breakers? I'm trying to fill the missing info I have in my knowledge because my ignorance says what the electrician did is wrong.
BTW it also looks like the A/C breaker was downgraded from 40A to 30A. I measured the current in the A/C in my unit and the running current is 18A so I thought I could do that but I was discouraged from doing that (in another post here) because of high current at start up, which made sense.
I could think of a weird way of using tandem by connecting one to one pole and another to another pole and butting them together and connecting them with a metal rod but ...now that would be streching the rules, wouldn't it? and something I wouldn't do myself but would it be legal? Anyway I don't see any metal rods connecting her breakers.