How can I wire a 120 VAC amp meter into a switch box?
I've been meaning to build cut-off switch boxes for my lights and pumps using double-size wall mount outlet/switch boxes. Mount a computer-style receptacle to accept power from the house circuit on one side, going through a switch to a standard GFCI outlet. Since the box will be big enough to accommodate it, I'd like to add a panel style meter that will show the load of the devices attached to the switch box.
I found this:
15A AC PANEL METER | All Electronics Corp - Parts, Supplies and Components
But I'm foggy as to how it should be wired into the circuit, and if it's going to show me just the load of the devices attached to the outlet controlled by the switch, or the load of everything on the same circuit, or the available power, or what.
I'm good on switches and outlets, but after that I get confused. I used to know more, but its been a while since I've had to take an FCC exam.
Edit: also, is it possible to do this, but mount an AFCI in the box rather than a regular switch? For this configuration, I'm imagining that there would be a 'primary' outlet box that would have a power supply receptacle, a load meter, an AFCI breaker and a GFCI outlet. The boxes described above could then be connected to a strip running off of the AFCI'd outlet.
Like this:
[[Grow Room Outlet]] ---computer PSU cord-----=> [[PSU-Receptacle-->AFCI Breaker-->Load Meter--->GFCI Outlet]] --->power strip-----
---->PSU cord------=> [[receptacle-->---meter-->SPST CO/ALR switch-->GFCI outlet]]---->subsystem powerstrip
That way you'd have a meter showing the total load on the circuit from the operation with a switch and an AFCI and then switches and meters for the sub-systems (I'd imagine two per grow chamber: one for lights/fans and the other for pumps/accessories.)
Maybe an AFCI is overkill or a bad idea, but I've hand wired a lot of stuff around my grow and I'm not knowledgeable enough to know whether I've done everything correctly such that any fault would result in a ground fault and trigger the GFCI's (that I do have installed.) So long as it won't trip due to HID ballasts or floros, it seems like an AFCI would be nice.