When does a UPS require electrical installation?

UPS below 3kVA tend to use power cords with a moulded plug. From 4-6kVA the UPS may use a 16A Commando type industrial socket (blue single phase or red three phase). Where the UPS does not have a plug the system is referred to as hardwired and will require electrical installation by a qualified electrical contractor working to the latest IEEE wiring regulations (currently version 18) and there may also be other on-site or local regulations to comply with.