ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Square D "All-In-One" Panelboard
by NORCAL - 11/30/21 12:48 PM
Where is Everyone?
by luckyshadow - 11/21/21 10:14 AM
It's been an interesting career
by The Watt Doctor - 11/19/21 09:56 AM
Well I am back to stay (nearly 6 years)
by The Watt Doctor - 11/19/21 09:17 AM
Motor Load Relationships Between Fans and Pumps
by The Watt Doctor - 11/18/21 09:24 AM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 41 guests, and 24 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#9959 05/24/02 01:16 PM
Joined: May 2002
Posts: 68
E
Eandrew Offline OP
Member
I'm an apprentice out of local 46 in seattle. I take pictures of electrical work here and there. I have a question regarding the two starter switches. Each are individually piped on the load and line side to two exaust fans in a parking garage. However, there is a nipple between the two fusable overload protection devices. Any ideas about what this nipple is for. Why are the two starter switches connected together. Any suggestions would be a great help. _thanks--Andrew.

#9960 05/24/02 04:20 PM
Joined: Oct 2000
Posts: 4,042
Likes: 3
Member
Andrew,

A difficult Answer here. Do you know if there are any wires in the nipple? I see things all the time that seem to have no logical explanation, you might have to find the installer to figure it out. But there could be some common control wirimg. (?)

Bill

[This message has been edited by Bill Addiss (edited 05-24-2002).]


Bill
#9961 05/24/02 04:44 PM
Joined: May 2002
Posts: 2
C
Junior Member
If there are no wires in it, it could have been used for addtional support ....just " a stab in the dark"

#9962 05/24/02 07:35 PM
Joined: Mar 2002
Posts: 582
R
Ron Offline
Member
Control wiring going back to the same place, and piped along with the power from one switch?


Ron
#9963 05/25/02 12:12 PM
Joined: May 2002
Posts: 68
E
Eandrew Offline OP
Member
Yes, I also have a picture with the starter switches open and I can see that all three phases on the load side of the fuse feed into block (factory wired). The other end of the block goes to feed the fan. while some low voltage colors go through the nipple into the other starter switch. I cant figure out why these two starter switches would need to control. Maybe they both must be on at the same time. So if one stops, so does the other. Well, I very much appreciate your suggestions. Thank you for your replys!-Erik

#9964 05/25/02 03:38 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Uhhmm, haven't you attacked them with your screwdriver yet? ;-) ;-) ;-)

I'd guess remote starting or remote status somewhere in the facility.

#9965 05/25/02 04:00 PM
Joined: May 2002
Posts: 1,716
R
Member
Don't know for sure, but it might have something to do with fire alarm shut downs.
Roger

#9966 05/28/02 06:10 AM
Joined: Mar 2001
Posts: 2,056
R
Member
Is the garage enclosed or open ? Is it possible that one fan is a fresh air supply and one is an exhaust? If so, there could be some sort of interlock to ensure that one is operating before the other starts.

#9967 05/28/02 09:27 AM
Joined: Oct 2000
Posts: 4,042
Likes: 3
Member
I was thinking it could be that the fans are on different circuits but use a common control power source.

Bill


Bill

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HotLine1
HotLine1
Brick, NJ USA
Posts: 7,283
Joined: April 2002
Top Posters(30 Days)
Admin 3
dsk 2
Popular Topics(Views)
286,309 Are you busy
218,760 Re: Forum
204,918 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5