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TN ring mains in hospital theatres

Is there any issue with installing a TN ring circuit in hospital operating theatre?

I appreciate Medical IT circuits are in a radial wiring pattern and ultimately any medical equipment is plugged into these circuits, but i'm talking about the 2 /3 TSSO's in the space that are for PC use?

Within BS 7671 clause 710.415.2.3 which talks about earthing there is a note which states:- It is recommended that radial wiring patterns are used to avoid ‘earth loops’ that may exacerbate electromagnetic disturbances.

My question is do these TN circuits need to follow this radial pattern or can ring mains be installed?

Matt

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0 mapj1 over 5 years ago

There is no technical reason not to use a ring for general use sockets for computers/office equipment. So long as they cannot be mistaken for part of an IT (in the earth sense) system, and go nowhere near it. There may be a house standard that means it is not expected, and arguably division of loads over more circuits of lower MCB rating are less likely to all goes off totally and work has to stop dead. Needless to say it needs to be very clear which sockets are supplied from which circuit.
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0 mapj1 over 5 years ago

There is no technical reason not to use a ring for general use sockets for computers/office equipment. So long as they cannot be mistaken for part of an IT (in the earth sense) system, and go nowhere near it. There may be a house standard that means it is not expected, and arguably division of loads over more circuits of lower MCB rating are less likely to all goes off totally and work has to stop dead. Needless to say it needs to be very clear which sockets are supplied from which circuit.
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TN ring mains in hospital theatres

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