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#50791 - 04/11/05 08:39 PM Russian Wiring Practice
Itoh Offline
Junior Member

Registered: 04/11/05
Posts: 3
Loc: Yokohama, Japan
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.

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#50792 - 04/12/05 02:25 PM Re: Russian Wiring Practice
maintenanceguy Offline

Registered: 12/02/01
Posts: 303
Loc: Southern NJ, USA
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.


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