I've just bought a 5 hp rotary converter off eBay. When I opened the box I found out that the guy used 18 ga wire for input and output. To me it sounds a way too thin, but I might be wrong.
At this point I'm going to run only 1 1/2 hp Bridgeport out of this converter. However, later I may need to add more loads.
Here are a few questions:
1. What gauge wire should I use to connect the converter to my 50 amp wall outlet (about 30 ft. run)?
2. What gauge should be used to connect the output of the converter to 3-phase outlets that I'll use to connect my machines to?
3. What internal wiring gauge should the converter have to be able to withstand a full load? It is a simple self starting type of RPC with two capacitors (no balancing capacitors)
I'm totally confused because I cannot figure out expected amperage running though each wire. The motor plate on my Baldor idler mentions 12 amps at 230V.The main Bridgeport 1 1/2 hp motor plate shows 4.4 Amp at 230 V which is 1.5 Amp per leg. If I connect my Bridgeport to the converter, the combo will draw 16.4 Amp from my single phase outlet. Correct so far?
What happens when a 5 hp converter feeds 5 hp load and the second load, while running, helps connect an additional 10 hp load to the system? Will the whole system draw an equivalent of a 20 hp load?
And now, if my assumptions were correct so far, let's try to figure out reasonable wire gauges for a situation when a 5 hp idler runs a 5 hp load. Based on the plate rating of my Baldor (12 Amp) and adding a safety margin, I assume that the combo will draw, approximately, 30 amp out of my single phase outlet. It means I'll need 10ga cable for the input. As for the output, since the collective 3-phase load applied to the converter will be 5 hp, the draw from the converter will be around 15 amp. So for the converter output I can use 14 ga wire.
Am I correct that the 18 ga used to wire input and output inside the RPC is insufficient?
Please help me sort this out. Thank you in advance.