View Full Version : Connecting circuit ground to mains ground
The Master
- 11th November 2009, 21:05
Hi, Im making a circuit that runs from a PCB transformer. Is it possible to connect the circuit ground after being rectified to the mains earth wire? The circuits use RS485 and im hoping to save on wiring
timmers
- 12th November 2009, 20:57
I take it you are trying to save a ground wire in the rs485 link and intend to use mains earth as the common reference...
Personally I would leave the "secondary side" floating to prevent any earth current loops. I would however use a Screened cable or an additional 0v reference line to complete the 3 wire link required by RS485.
Tim.
The Master
- 12th November 2009, 22:02
I see, Im going to use twisted pair for A and B but not screened. Ill keep the 0V reference wire though.
Thanks for your help
Powered by vBulletin® Version 4.1.7 Copyright © 2024 vBulletin Solutions, Inc. All rights reserved.