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I've seen most UPS's state not to attach a multi socket extension socket to them would this be the case with metered switched pdu aswell?
Not seen it in any other UPS' I've used.Never heard of that, almost all of our UPSes at work have either iec socket PDUs or normal 4 way (UK plug) extension leads connected.
I would say it's probably just a disclaimer to discourage people from overloading them by plugging too many devices in