jmp46205
New member
- Location
- New York, New York
I'm trying to expand my knowledge of conductor selection for high amp systems and would like your assistance in clearly understanding how an equipment manufacture selected the recommended conductor and conduit sizes for the equipment.
Equipment Specs:
* Three Phase Input
* Nominal Input Current - 311 VAC
* Maximum Input Current - 389
* Recommended cable sizes are 167?F (75?C) (THW) wire at 86?F (30?C) ambient
Manufacturer Recommended input conductor and conduit:
* Conductor
- Phase: 3-250kcmil
- Ground: #1/0AWG
* Conduit
- (2) 2.5C
My questions are:
1. Based on the maximum input voltage, I would have expected the conduit size to be either 1-600kcmil or 2-#3/0AWG. How does the manufacturer calculate 3-250kcmil?
2. How is #1/0AWG ground calculated?
3. How is (2) 2.5C conduit calculated?
Note: This is not for a specific project that I'm working on, it's strictly for research and my own increased knowledge.
Equipment Specs:
* Three Phase Input
* Nominal Input Current - 311 VAC
* Maximum Input Current - 389
* Recommended cable sizes are 167?F (75?C) (THW) wire at 86?F (30?C) ambient
Manufacturer Recommended input conductor and conduit:
* Conductor
- Phase: 3-250kcmil
- Ground: #1/0AWG
* Conduit
- (2) 2.5C
My questions are:
1. Based on the maximum input voltage, I would have expected the conduit size to be either 1-600kcmil or 2-#3/0AWG. How does the manufacturer calculate 3-250kcmil?
2. How is #1/0AWG ground calculated?
3. How is (2) 2.5C conduit calculated?
Note: This is not for a specific project that I'm working on, it's strictly for research and my own increased knowledge.