ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
From an outsider- How does tipping work?
by HotLine1 - 12/04/20 01:09 PM
Thought this was funny
by HotLine1 - 12/04/20 12:55 PM
Happy Thanksgiving
by Trumpy - 12/02/20 04:11 AM
Where is Everyone?
by Trumpy - 12/02/20 03:51 AM
What does your work place look like?
by Trumpy - 12/02/20 03:42 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 17 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Russian Wiring Practice #50791 04/11/05 10:39 PM
Joined: Apr 2005
Posts: 4
I
Itoh Offline OP
Junior Member
We are wirking for Russian construction project. According to our Russian partner, wiring methos for 24V DC instrument such as transmitter, solenoid valve, gas detectors, etc. shall be 3-wire system (+/- and earthing). As far as I know, the 3-wire method is very old Russian practice and it is not valid any more. Therefore we understand that europian style 2-wire system (+/- only) is sufficient for 24V DC instrument wiring. I appreciate if somebody give me your feddback/experience.

Work Gear for Electricians and the Trades
Re: Russian Wiring Practice #50792 04/12/05 04:25 PM
Joined: Dec 2001
Posts: 300
M
maintenanceguy Offline
Member
Typically in the US we use two wire (+,-) for these things. The negative (-) is at ground potential so there is no need for a separate earth ground.

In electronics (such as at the circuit board) there are many times when you will have 3 wires, one is at ground potential and one is positive relative to ground and one negative relative to ground. Fo example: +/- 9V which gives you 18V from + to -. but I've never seen this in control wiring.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,155
Joined: May 2003
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 20
Popular Topics(Views)
272,260 Are you busy
206,151 Re: Forum
194,139 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3