The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
Today at 04:24 PM
On Delay Relay with Auto Reset
by Potseal
Yesterday at 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 15
HotLine1 10
Texas_Ranger 8
Trumpy 8
sparkyinak 7
Who's Online
0 registered (), 218 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#76648 - 03/04/01 09:25 PM smoke alarm question
GaryGnu Offline
Junior Member

Registered: 03/04/01
Posts: 7
Loc: MD, USA
I am in the process of finishing a basement. One of the circuits I am using passes through a box that contains a smoke alarm. This smoke alarm is wired using 4 wires (ground/neutral/black/red). The red wire is part of a 14/3 wire that goes upstairs in the house (not sure where). My question is why does this smoke alarm have 2 hot wires (black red)?

Thanks for any help.

Top
2014 / 2011 NEC & Related Books and Study Guides
#76649 - 03/04/01 10:02 PM Re: smoke alarm question
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Black would be the hot wire, red would be a communication wire to set off all of the smoke alarms at once. The detector may have black and orange wires (as well as a white grounded conductor), the black wire would go to the black conductor, the orange wire to the red conductor. The white wire goes to the white grounded conductor and green or bare (if it has any) goes to the green or bare equipment grounding conductor.
_________________________
-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

Top
#76650 - 03/05/01 06:51 AM Re: smoke alarm question
GaryGnu Offline
Junior Member

Registered: 03/04/01
Posts: 7
Loc: MD, USA
The smoke detector actually has a yellow wire which is connected to the red wire on the 14/3. I would like to test these alarms since I had to temporarily disconnect them. How do I accomplish this? Is pressing the test button going to set off the other smoke detectors in the house? Or do I need to blow smoke into the alarm?

Top
#76651 - 03/05/01 11:09 AM Re: smoke alarm question
sparky66wv Offline
Member

Registered: 11/17/00
Posts: 2339
Loc: West Virginia
Yes, the yellow in this case would be correct.

The test button on any detector should set off all detectors connected to the system.



[This message has been edited by sparky66wv (edited 03-05-2001).]
_________________________
-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals