I have a Client that will not provide a Risk Assessment to omit an RCD Commando Socket for a Data Cabinet. He wishes to employ a local isolator for the Cabinet, however he is concerned that the PDU Strip that arrived on site from the factory and pre-fitted within the data cabinet would still need an RCD. It is my opinion that the Factory built Data Rack is classed as a piece of equipment and as such does not form part of the Contractor's installation. If the Rack had arrived on site without the PDU strip fitted and it was installed by the Contractor then this would form part of the installation and therefore would require an RCD. Any advice/assistance would be appreciated.
I have a situation where some of the IT cabinets are 3 Phase and I dread the thought of an IT Technician interconnecting the power to dual fed Servers for obvious reasons.
I wouldn't worry about that, provided the outlets are single-phase. In servers or network with multiple PSUs, they are usually single-phase only, and the supplies are not "bussed" on the AC side.
Such equipment is made to use in situations where some of the supplies are connected to UPS. Even if the two separate supplies were on the same phase (albeit potentially from different transformers in redundant supply situations), the UPS is not "phase locked" with the live supply (or another UPS), and therefore you might get times where there's 480 V between Line conductors (of the separate supplies), but each enclosed PSU only sees 230 V to earth (and hopefully Neutral).
I have a situation where some of the IT cabinets are 3 Phase and I dread the thought of an IT Technician interconnecting the power to dual fed Servers for obvious reasons.
I wouldn't worry about that, provided the outlets are single-phase. In servers or network with multiple PSUs, they are usually single-phase only, and the supplies are not "bussed" on the AC side.
Such equipment is made to use in situations where some of the supplies are connected to UPS. Even if the two separate supplies were on the same phase (albeit potentially from different transformers in redundant supply situations), the UPS is not "phase locked" with the live supply (or another UPS), and therefore you might get times where there's 480 V between Line conductors (of the separate supplies), but each enclosed PSU only sees 230 V to earth (and hopefully Neutral).
