How Many Single Conductors In Ladder Type Tray

[SWILLIAMSON]

I am feeding two MCCs from two different breakers in a 480V Switchgear through the same tray. The breakers are 1200A. I'm running (4) 500 kcmil per phase and (2) 500 kcmil grounds per circuit, 28 cables total, through aluminium ladder type tray. I'm confused, if I run these in a single layer, do I need to keep a space the diameter size of the cable between each cable, or can I run these single layer with them touching? What are my options?

 

[jeremy.zinkofsky]

I am feeding two MCCs from two different breakers in a 480V Switchgear through the same tray. The breakers are 1200A. I'm running (4) 500 kcmil per phase and (2) 500 kcmil grounds per circuit, 28 cables total, through aluminium ladder type tray. I'm confused, if I run these in a single layer, do I need to keep a space the diameter size of the cable between each cable, or can I run these single layer with them touching? What are my options?

Is this for an industrial application?

 

[Smart $]

I am feeding two MCCs from two different breakers in a 480V Switchgear through the same tray. The breakers are 1200A. I'm running (4) 500 kcmil per phase and (2) 500 kcmil grounds per circuit, 28 cables total, through aluminium ladder type tray. I'm confused, if I run these in a single layer, do I need to keep a space the diameter size of the cable between each cable, or can I run these single layer with them touching? What are my options?

You can run them in a single layer touching or spaced, or you can run them triplexed, touching or spaced. What comes into play is conductor ampacity as a result of how you run them. I'll let you try to figure that out. But if you have a problem with doing so, do not hesitate to post again.

Why are you running a 500kcmil EGC per feeder when only 3/0 copper is required? Just to keep all conductors the same size?

Welcome to the forum. :thumbsup:

 

[publicgood]

28 cables total

To be clear, you sound like you are describing conductors, not cables; although, these single conductors could be cables MC or AC say.

Be sure whatever they are, they are listed for tray use.