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Explanation: for the UK; I'm not sure about the USA.
As I read it, the giveaway is that they are writing about the supply company's lead (which is heavy duty cable), and some other type of "consumer" cable, which would normally be the cable connected to your fridge, cooker etc., which here is the "Verbraucher" of electricity. You'd hardly plug an electric cable into...well, let's not go any further down that road...
David Moore Local time: 03:41 Native speaker of: English PRO pts in category: 208
Explanation: Given that we are takling about battery backup systems, it seems reasonable that one might have a supply cable, connected to the mains; an earth cable, connected to ground; and an output cable, connected to the devices which are supposed to keep running in the event of a power outage.
David Willett United Kingdom Local time: 02:41 Specializes in field Native speaker of: English PRO pts in category: 31