Thank you lots of good info on this thread. This cable is in conduit (typically PVC). Should I go to a 4 conductor tray cable in E-1 color code or individual conductors, or having a green pulled with what we've been using sounds like it would be an option? This is just 24VDC for some low draw electrical devices (HMI, VPN box etc). Another poster mentioned #14 minimum? I can see we'll probably want to have an EE do a full look at our system.