Re: 480VAC / 24VDC Wiring in same Conduit
To: plcguyntn, You are not going to solve your problem by going to the NEC, because your solution is not there. I will tell you what we did in our low voltage situations with PLC's. We would always put our low voltage wiring in separate conduits, and/or cables in separate instrument cable trays. The low voltage cable would be shielded cable, and as you probably know, you only bond one end of a cable shield to ground, and that is generally in the low voltage source cabinet.I worked in large industrial chemical plant, and that was our standard procedure, and you will not find that experience in the NEC.
C's or any low voltage controls.
We would always put the low voltage controls in a separate conduit and/or cable tray and in shielded cable. Now, when you use shielded cable, you will only bond the shield to ground at one end of the cable, and that would generally be back a cabinet where the low voltage source is.