Need some code guidance please regarding how to implement this for the lowest cost...
I want to place about a dozen 16-port Industrial Ethernet switches throughout our facility for a distributed control system. Each will be a zone fed by fiber. Then copper to the zone devices.
I don't want to run the switch off the 120 house power breaker panels. Someone plugs in 3-4 fans, a microwave, and two crock pots...pops a breaker... and I lose my network. This is what our IS/IT department for the in-plant Cisco gear. A few times per quarter their switch is offline because of a popped breaker due to shared circuits. I'm not sharing my important stuff with someone's blue tooth speaker and I'm not putting on breaker locks. Heck our panels are so full I don't think I could get a dedicated circuit.
So my plan is to run directly off a dedicated can from our bus duct to a 480VAC three phase to 24VDC output power supply. The power supply feeds the switch. I won't have to have a transformer. It would have a low parts count. Really simple. Like I can do that with a single three phase fuse holder and a ground lug sort of simple.
I'm trying to figure out if I need an interlocked door switch. I'm trying my best to get around it. I'm hunting through NFPA70 and 79. This isn't a motor controller (430). It's not really an industrial control panel (409). It doesn't really fit into the telcom areas of the code either. It's not a industrial machine (670? ---from memory). UL508A isn't much help either. I'm getting really frustrated.
I don't feel like this could be considered a junction box. While there aren't any controllers or switching devices in the box I think it would be a stretch to try to sell it to the AHJ under that premise.
Can someone please point me in the right direction as to what the minimum requirement would be such that I don't have to interlock the door with power off.
I'm also curious is anyone else has gone this route for the same reasons.
If I cannot have my way please give your recommendations for a good low cost disconnect that doesn't suck, wear out, become misaligned, or break after a year.
Thank you for any direction.
I want to place about a dozen 16-port Industrial Ethernet switches throughout our facility for a distributed control system. Each will be a zone fed by fiber. Then copper to the zone devices.
I don't want to run the switch off the 120 house power breaker panels. Someone plugs in 3-4 fans, a microwave, and two crock pots...pops a breaker... and I lose my network. This is what our IS/IT department for the in-plant Cisco gear. A few times per quarter their switch is offline because of a popped breaker due to shared circuits. I'm not sharing my important stuff with someone's blue tooth speaker and I'm not putting on breaker locks. Heck our panels are so full I don't think I could get a dedicated circuit.
So my plan is to run directly off a dedicated can from our bus duct to a 480VAC three phase to 24VDC output power supply. The power supply feeds the switch. I won't have to have a transformer. It would have a low parts count. Really simple. Like I can do that with a single three phase fuse holder and a ground lug sort of simple.
I'm trying to figure out if I need an interlocked door switch. I'm trying my best to get around it. I'm hunting through NFPA70 and 79. This isn't a motor controller (430). It's not really an industrial control panel (409). It doesn't really fit into the telcom areas of the code either. It's not a industrial machine (670? ---from memory). UL508A isn't much help either. I'm getting really frustrated.
I don't feel like this could be considered a junction box. While there aren't any controllers or switching devices in the box I think it would be a stretch to try to sell it to the AHJ under that premise.
Can someone please point me in the right direction as to what the minimum requirement would be such that I don't have to interlock the door with power off.
I'm also curious is anyone else has gone this route for the same reasons.
If I cannot have my way please give your recommendations for a good low cost disconnect that doesn't suck, wear out, become misaligned, or break after a year.
Thank you for any direction.