Hi, I'm fairly new to electrical work and I was trying to understand what is happening with a system I'm working on. I have 208VAC 3 phase power coming into a component via 3 fat needle pins that mate with 3 friction clamps. A at 50Hz, B at 60Hz, and C at 400Hz. I pulled the component and discovered charring on the chassis and the C phase clamp was deformed and had copper spatter on the end. Phase B and C connect to a transformer. I'm only getting 113VAC on my 3 lines and the component is not pushing any voltage out so I am chasing a short currently. So my question is could a decrease in voltage cause arcing and why? I don't think it's a bad connection as both ends appear to be fine. I suspect heat may be an issue as the fan might not be getting power but I have no way of seeing if the fan is running while the component is slotted in.
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