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Mooreski 02-07-2008 05:38 PM

Need a wiring diagram
 
Ok so is this possible? I have a 3 gang box... I have one power supply coming in that needs to run 3 switches and a receptacle...

Switch 1 controls the overhead light

Switch 2 controls the exhaust fan

Switch 3 controls the vanity lighting

The catch is I would like switch 1 and switch two to be run to the light and the fan in series together (only one wire rather than running a wire from each switch to each device) I have a feeling it can be done but my question is how? 3 wire likely comes into play somewhere I am just unsure as to where.

Can someone hook me up with a wiring diagram of what is required please?


Here is a graphical representation of what I mean

Hey I am new here and this is my first thread. I have a good idea how this should be done but I just need confirmation that it can be before I ask my contractor to do it and have him look at me like an idiot...

I want a 3 gang box in my bathroom... In the gang box itself I want 3 switches... One to control my overhead light, one for my exhaust fan and one for my vanity lights... off of that I am running a standard receptacle... the catch is i want only one wire run from the gang box to the over head light and exhaust fan... here is how i want it to work out... i just need confirmation it can be done and a diagram to show me how if possible... thanks alot

http://img.photobucket.com/albums/v6...ingdiagram.png

nap 02-07-2008 05:52 PM

Do you mean 1 wire or 1 cable and why do you need this?

Mooreski 02-07-2008 06:01 PM

1 cable and it is for a new bathroom circuit. It is a small bathroom which doubles as a laundry room so there is alot of wiring and plumbing in the walls as it is. I would like to minimize the amount of wire I have to run.

junkcollector 02-07-2008 06:03 PM

what do you need the diagram for? The whole setup or just the 3 gang switch box?

Mooreski 02-07-2008 06:05 PM

I have a rough idea how it should be done but there are some details I am unsure of. The big thing is how to get my two switches controlling the sepearate devices on one cable. Although the entire diagram would be nice

joed 02-07-2008 06:15 PM

I can't make drawings but I can write.
Run a three wire cable+grd to each fan/light from the switch boxes.
Take the power in black wire and connect three short balck wires to it with a wire nut. Connect one of these pigtails to each switch.
Connect al the white wire together.
Connect all the ground wires together and to the switches if they have green ground screws.
Connect the black wire from the cable to one switch.
Connect the red wire from the same to the other switch.
Repeat for as many fan/light you have.
At the fan
Connect the black wire fro the cable to the black wire (fan)on the fan.
Connect the red from the cable to the blue wire(light) on the fan.Connect The white from the cable to the white from the fan.

220/221 02-07-2008 06:19 PM

I won't ask why.


Just run a 3 wire cable from sw box to your light and a 2 wire from the light to the fan.

Use the red wire for one and the black for the other. They will both use the same neutral (white)

Mooreski 02-07-2008 06:21 PM

Hmmm that sounds close except that the fan is just an exhaust fan without a light and the light is just a plain light... so no blue...

Stubbie 02-07-2008 07:21 PM

I take it the fan and the overhead light are not the same unit and are seperated by some distance? If so and your diagram seems to suggest it, then do exactly as Joe or 221 said run a 2 wire with ground from the light to the fan and connect the red of the three wire cable coming from the switch box to the black in the cable to the fan the white of that cable to the other whites at the fan black to black white to white and ground it.

If this is new bathroom a 20 amp branch circuit is required for the bath and gfci for the receptacle this circuit cannot supply anything else but this bathroom.

Stubbie 02-07-2008 09:19 PM

1 Attachment(s)
This is what I believe you want. Click the image to enlarge. I would also suggest you use push connectors at the switch box for the grounds and hots and neutrals. This many wires going into the wirenuts is not easily done by someone not doing this everyday.

Silk 02-07-2008 10:21 PM

Cool pic stubbie. What kind of graphics program do you have that has all the elec. stuff?

Mooreski 02-07-2008 10:34 PM

Thanks Stubbie I appreciate it... It is pretty much what I was thinking except I wasnt sure where the red from the three wire came into play... seeing it clears everything up...

Also I ground everything in the box so that takes some of the wires out of play for me... I will take the push connectors suggestion too...

Also as Silk asked what program did you use or are you just a perfectionist at MS paint lol

AdamVocks 02-07-2008 10:43 PM

Quote:

Originally Posted by Stubbie (Post 95918)
This is what I believe you want. Click the image to enlarge. I would also suggest you use push connectors at the switch box for the grounds and hots and neutrals. This many wires going into the wirenuts is not easily done by someone not doing this everyday.

Is there a code limit to the number of wires in a wirenut or just a physical problem? Also, is there a limit to the number of wirenut connections in a box like that?

Adam

Silk 02-07-2008 10:55 PM

1. Yes there is a limit by code, must be used as listed.

110.3(B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.

2. Yes, you must calculate the box fill.

314.16(B) Box Fill Calculations. The volumes in paragraphs 314.16(B)(1) through (B)(5), as applicable, shall be added together. No allowance shall be required for small fittings such as locknuts and bushings.
(1) Conductor Fill. Each conductor that originates outside the box and terminates or is spliced within the box shall be counted once, and each conductor that passes through the box without splice or termination shall be counted once. Each loop or coil of unbroken conductor not less than twice the minimum length required for free conductors in 300.14 shall be counted twice. The conductor fill shall be calculated using Table 314.16(B). A conductor, no part of which leaves the box, shall not be counted.
Exception: An equipment grounding conductor or conductors or not over four fixture wires smaller than 14 AWG, or both, shall be permitted to be omitted from the calculations where they enter a box from a domed luminaire or similar canopy and terminate within that box.
(2) Clamp Fill. Where one or more internal cable clamps, whether factory or field supplied, are present in the box, a single volume allowance in accordance with Table 314.16(B) shall be made based on the largest conductor present in the box. No allowance shall be required for a cable connector with its clamping mechanism outside the box.
(3) Support Fittings Fill. Where one or more luminaire studs or hickeys are present in the box, a single volume allowance in accordance with Table 314.16(B) shall be made for each type of fitting based on the largest conductor present in the box.
(4) Device or Equipment Fill. For each yoke or strap containing one or more devices or equipment, a double volume allowance in accordance with Table 314.16(B) shall be made for each yoke or strap based on the largest conductor connected to a device(s) or equipment supported by that yoke or strap. A device or utilization equipment wider than a single 50 mm (2 in.) device box as described in Table 314.16(A) shall have double volume allowances provided for each gang required for mounting.

Table 314.16(B) Volume Allowance Required per Conductor
Free Space Within Box for Each Conductor
Size of Conductor (AWG) cm3 in.3
18 24.6 1.50
16 28.7 1.75
14 32.8 2.00
12 36.9 2.25
10 41.0 2.50
8 49.2 3.00
6 81.9 5.00

AdamVocks 02-07-2008 11:06 PM

Thanks! So...In other words...RTFM.:)

It's very nice to have you guys on here to point people in the right direction. I couldn't imagine working all day and then coming home and helping DIYers online. But many thanks to those who do!

Adam


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