I am wondering what experts do when a box is reaching full wire capacity (I dread trying to shove 14 wires into a 3-gang box), and the box has 3- and 4- way switches. Is it easier to power the lights and then feed the switches in switch loop (if that's what it's called) format? This attached picture shows the box in question: [ATTACH]52123[/ATTACH] The 12/2 wire on the left feeds the first of two 3-way switches - the 2nd switch in this circuit is in the garage for the front lights. The middle switch will be a 4-way switch for the garage interior lights - the other two are in the front and back of the garage. The switch on the right will be for the laundry rooms lights where the box is - and is on a different breaker. The laundry room light circuit goes power-switch-light-this switch in photo, and isn't what concerns me. What I am thinking of doing, but don't know if it is possible, is if the garage interior lights get power first, and then from the fourth light to the first of the 3-way switches in the garage, then to this 4-way switch, then out to the other 3-way switch. 12/3 wires between switches, and 12/2 between the lights? And then for the front lights on garage, power them first, then to the 3-way switch in the garage, then to the left-most 3-way switch here in this photo. That would allow me to remove at least the 12/2 on the left, as it will be going to the front lights. That bottom middle 12/3 isn't fed into the box yet, as I was getting it there it started to seem like I was never going to fit all of these wires into the box. The stamping on the box reads 19/12ga, and with 3 switches I think I count 18 conductors, but that includes a huge 5-wire ground pigtail, not to mention the neutral. At what point does a professional electrician say that's too much, and go with a switch loop to get rid of at least one cable from the box? Thank you so much if you can help.

My roofer is in the process of installing 2 power vents for my attic. I don't know if he is planning to bring in an electrician to make the electrical connections, but I want to make sure they're wired correctly. They will be side-by-side in the top part of the roof above the attic utility area which has 2 gas furnaces and a water heater. They have thermostatic controls that are designed to be hardwired. Each furnace has a dedicated 20 amp circuit run to a receptacle where the furnace is cord connected (fairly standard in this area). It would be easiest to pull power by wiring into 1 or both furnace receptacles (both fans on one or one fan on each) since they are right there and have plenty of spare capacity (2 amp fans, unsure of amperage for each furnace, but can't be more than 10 amps so total is well under the 80% max). Is this code compliant or do those circuits need to remain dedicated? My plan also includes installing a switch on each fan so power can be removed easily and locally for maintenance. If I can't wire to the furnace circuits, plan B would be to pull power from the attic light, but it's on one of the bedroom circuits which is only 15 amps. Each bedroom has a dedicated circuit so probably wouldn't be a big issue... Thoughts?