need help to run this circuit

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  #1  
Old 06-13-03, 10:53 AM
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need help to run this circuit

Please help me to run wire for the following in my basement (I have complete access to the ceiling and walls): A and C are recessed lights; B will be an outlet for hanging lights for pool table and SD are smoke detectors. At present, there is a 14/2 power cable from Panel to B. Thanks in advance.

Switch B .............. Panel ............ 3-Way Switches A & C


A......... A............A ...............A

.......... B....................SD.................. C.................C

A .........A............A.................A



..................................................... SD



.........................................................3-Way Switches A & C
 
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Old 06-13-03, 01:07 PM
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I'm going to have to make some assumptions here, so correct me if I'm wrong.

Does your code allow Smoke detectors to share a circuit with general wiring?

You will have B and SD on one breaker and a different breaker for A and C. (This allows for one circuit to trip and not leave you in total darkness).

Your diagram generally describes the room.

The least amount of wire will make the most complex circuit and therefore you will not use that method.

You know to connect all grounds in a box to each other and to the screw on all devices (switch, outlet, fixture) in that box.

So far, so good.

Easy stuff first:

Wire each A light to the next one with 14-2. White to whiite. Black to black.

Wire each C light to the next one. Wh to wh. Black to black.

Wire both SD to each other with 18-20 ga. wire, according to the mfr's instructions for ganging them.

Run 14-2 from panel to Switch A1 (Sw-A1). Run 14-2 from Sw-A1 to Switch C1(Sw-C1).

Run 14-2 from the panel to switch B (Sw-B).

Run 14-2 from Sw-B to SD1.

Run 14-2 from Sw-B to B outlet.

Run 14-3 from Sw-A1 to Sw-A2.

Run 14-3 from Sw-C1 to Sw-C2.

Run 14-2 from Sw-A2 to closest A light fixture. Wirenut white to white black to black.

Run 14-2 from Sw-C2 to closest C light fixture. Wirenut white to white black to black.



-----------------------------
Harder stuff:

At Sw-B, wire nut black from panel to black to SD1 and to a 6-inch piece of black 14-2. The other end of the 6-inch piece goes on one of screws on switch. Black from outlet B to other screw. Wire nut 3 whites together at Sw-B. At outlet B, white to silver screw, black to brass screw.

At SD1, black to appropriate screw white to appropriate screw (see mfr's instructs).

At Sw-A1 wire nut black from panel to black to Sw-C1 and a 6-inch piece of black 14-2. Other end of 6-inch piece to common screw on Sw-A1. Wire nut whites from panel, white to Sw-C1 and white of the 14-3 to Sw-A2 together. The red and black of the 14-3 to Sw-A2 go on each of the traveler screws (doesn't matter which).

At Sw-C1, connect black from Sw-A1 to common screw on switch. Wirenut white from Sw-A1 and white of 14-3 to Sw-C2 together. The red and black of the 14-3 go on the traveler screws.

At Sw-A2 put black from fixture on the common screw. Wirenut white of 14-3 from Sw-A1 and white from fixture together. Put red and black of 14-3 on traveler screws.

At Sw-C2, wire same as SW-A2.
 
  #3  
Old 06-13-03, 02:21 PM
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Thanks for your detailed reply AbNORMAL,

1. These SDs are battery backup type. The instruction came with it does not mention that they have to be on a separate circuit. I assume that Code allows them sharing with a general circuit. If not, the inspector will let me know.
2. All lights A, B, C and SDs must share one circuit. I dont have an extra circuit. I wont be in the dark if the circuit trip because these lights A-C cover only one side of the room in the basement. The lights for the other side on a different circuit has been wired and worked well (thanks to Sparky and John!)
3. Yes, the diagraphm describe the room and locations of them

NEW questions about SDs

Each SD has 3 wires: black, white and yellow. According to instruction, yellow is for connection to other SD(s). Do I need to have power fed (black, white and ground) to only one SD1 and connect SD1 and SD2 through the yellow wire only (cap off the black and white wire of SD2) or do I need to have feed power to both SD1 and SD2 and connect their yellow wires together? Further, since these SDs has no ground wire, i assume the ground from power cable will be fixed to a metallic box or capped off in a plastic box, right?

I appreciate your help. Thanks again.
 
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Old 06-13-03, 05:23 PM
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Do I need to have power fed (black, white and ground) to only one SD1 and connect SD1 and SD2 through the yellow wire only (cap off the black and white wire of SD2) or do I need to have feed power to both SD1 and SD2 and connect their yellow wires together?
Each smoke detector needs two wires for power, one wire for signaling, and one wire for grounding. So the answer to your either/or question is the second of the two ways you mentioned.
 
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