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| Subject - Control wiring | |
| Dave Nix |
Here is one I found today. An A/C condensing unit on a pad in the rear of a commercial building. The disconnect contained the usual power conductors plus the control cable from the furnace to the condenser. This cable entered the disco with the power conductors and left with the power conductors in the same raceway. Is this a Red Tag? |
| JimmyDee | Only if the 24 volt system isn't 600 volt wire. If it is the regular low voltage wire it can't be installed with the other wires or in the disconnect. Of course it doesn't matter if it is commercial or residential. Jim |
| Dave Nix | Hi Jimmy, What about 725.55? Would this not apply?? |
| JimmyDee | Back at you Dave, If I were to do the mixing of the 2 systems, I'd always use a 600 volt wire for the class 2 wiring or have some type of insulated separation. 725.55 seems to say that is still OK. Article 725.55(D)2.b. says that if the class 2 circuit is treated like a class one circuit, then it can be run in the same raceway as the class one circuit. Because the 6mm required separation could not be maintained in a race way, I would rule out using the other class 2 cables in the same race way or disconnect. Jim |
| Dave Nix | Hi Jimmy, Thanks for your reply. Looking at 725.55(D)(2)(B, I noticed is deals with "Within Enclosures" and therefore wouldn't apply. Another option may be 725.52 (A) Ex.2 "...the entire circuit is installed using the wiring methods and materials in accordance with Part II, Class 1 circuits." but I think this would be impractical to convert to class 1 methods. Your thoughts? |
| JimmyDee | I've done both. I guess I've had a few times where it seemed like a good idea to convert a class 2 to a class 1. From what I remember it was a quick fix and got the wires into a common raceway system.  Mostly did this on an AC hookup but now I just run the stat wire in the open and tape it to the whip going to the AC unit. Actually, the AC installer usually takes it from the disconnect at the outside of the house.
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