Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-18-2011, 12:44 PM   #1
Newbie
 
Join Date: Jan 2011
Posts: 8
Share |
Default

Junction box and light switches


I have a junction box with one wire coming into it supplying power to the two wires coming out of it. The wire supplying power to the junction box isn't controlled by a switch. One wire coming out of the junction box is going to power hard wired smoke detectors, which will always need to be on. The other wire coming out of the junction box is going to run to a ceiling fan. To the ceiling fan box I will also have two 12/3 wires going into the ceiling fan box. Each of the 12/3 wires will be connected to it's own switch on the opposite side of the room.

My question is, In this configuration will the light switches turn the smoke detectors on/off?

travesty is offline   Reply With Quote
Old 01-18-2011, 01:19 PM   #2
Mad Scientist
 
Join Date: Dec 2009
Location: Minnesota
Posts: 762
Default

Junction box and light switches


Not if you wire it right. If I'm reading this right, in the first junction box you mention, just wirenut all the hots together, all the neutrals together, and all the grounds together. It's only in the ceiling box that the switches come in to play.

Edit for clarity:
Wired this way, the constant power coming into the first junction box will be split, with constant power going to the smoke detectors, and also to the ceiling fan box. Are you going to be using a three-way switch on each side of the room to control the fan?


Last edited by McSteve; 01-18-2011 at 01:21 PM. Reason: Clarity...
McSteve is offline   Reply With Quote
Old 01-18-2011, 01:38 PM   #3
Member
 
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 6,867
Default

Junction box and light switches


For three way switches it is prefereable to run the 3 wire cable nonstop between the switches. It may pass by the outside of the light or fan box if that is the most convenient route. Then run a 2 wire cable back to the light box or fan box as needed. To control light and fan separately using 3 way switches, two 3 wire runs between the switches are needed.

When the 3 wire cabling goes into the fan box and connections are made there, you have to account for the extra wire ends entering the box which in turn may need a bigger box than you might otherwise have planned.
__________________
Stop wasting time re-adjusting the pattern. Have several lawn sprinklers, one for each pattern.
AllanJ is offline   Reply With Quote
Old 01-18-2011, 01:49 PM   #4
Newbie
 
Join Date: Jan 2011
Posts: 8
Default

Junction box and light switches


McSteve,

Your edit for clarity is spot on. One wire coming out of the junction box to the smoke detectors. One wire coming out of the junction box to the ceiling fan. Then I will have two 12/3 wires going into the ceiling fan box, so I can hookup two 3-way switches.
travesty is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.