I moved a metal electrical box for a smoke detector from a drop
ceiling to a drywall ceiling a couple feet away. This box has a doorbell transformer attached to it. In order to mount the
box, the transformer will be inside the ceiling. Is this a fire hazard?
This is not a legal installation. The Code does not allow you to 'bury' the transformer
within the drywall; it must be left accessible at all times.
I want to run 3 individual circuits in the same conduit.
I’m going to install 3 hots and 3 neutrals instead of 3 hots and 1 neutral because I want individual breakers for each
circuit. Is this considered three or six current carrying conductors if I do it this way?
Both neutral (grounded) and 'hot' (ungrounded) conductors are all considered current
carrying conductors. The grounding wire(s) that must also be installed in the same raceway is not considered current carrying
for derating purposes, but must be counted for proper conduit sizing.
As a side note, if you wanted to run a multi-conductor
circuit, you can't have more than two hot conductors sharing a neutral conductor (unless it’s a 3-phase circuit), and
those hot conductors must be installed on opposing phases.