I have a 5 gang switch box I'm trying to calculate how many "conductors" I can have in it. Basically my main question is, do wires that originate and terminate inside the box count as +1 each (wires in nuts/splices going to switch)? Or is it only wires that originate outside the box and come into it?
I have a 63in³ (2.75x2.5x9.25) box with 5x standard switches, I'm looking to replace with zwave switches. From my calculations I have (all 14ga):
+12 Hot/Neutral wires coming into the box (2 from breaker panel, 10 feeding the 5 lights)
+1 Ground (6 bare ground coming in/out but only 1 counts for this?)
+1 wire clamps in the box
+10 Devices ( 5 switches, counts as 2 each)
+3 Traveler wires (Do these count?)
So if it's that simple, I need at least a 54in³ and I'm good. But my question is what about the spliced short wires that originate and terminate in the box? So if all 6 of my neutrals (for the 5 switches and 1 live) are bonded together under a wire nut, then I run a neutral from that bond to each of the switches, that's +5 more spliced wires, do they need to get counted? And if I do similar for ground and hot that's another +10. Then I get into more fun dilemmas like max conductors in a wire nut and making splicing chains (my GB reds say only 5x #14).
It's a really ugly layout I wish they had split this up into different boxes, but I want to convert this whole thing so it can be put on my HA system. The current layout of 5x 2-wire switches has a lot less wires in the box so box fill isn't as much of a concern, but considering smart switches need both neutral and ground running to them as well it adds a lot more to that box. It's going to be really cramped with all the splices/wire nuts.
Anything else I'm not considering?