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BS EN 50310 - bonding of cabinet doors

Hugh McLaren

Hi,

I'm working on a data centre project - metal cabinets, all provided with earth bonding. The supplier is proposing installing bonding from the cabinet frames to doors using 4mm^2 CSA stranded cable, with a bullet connector in the middle of the conductor to provide for the 'quick connect' per BS EN 50310 s7.5.3.1.

My question is: are these bullet connectors fit for the job? We've had experience of these failing in previous installations due to repeated flexing every time a door is opened. Are there better options?

Parents
  • +1

    I've seen a lot of problems where cables with Class 2 stranded conductors (minimum of 7 strands) have been used for the doors, and such stiff conductors are not 100 % compatible opening and closing the doors. Class 5 (flexible), e.g. H05V-F for PVC, is preferable and is likely to reduce issues with 'bullets' on cabinet doors.

    Side panels appear to be less of an issue with Class 2 stranded conductors.

Reply
  • +1

    I've seen a lot of problems where cables with Class 2 stranded conductors (minimum of 7 strands) have been used for the doors, and such stiff conductors are not 100 % compatible opening and closing the doors. Class 5 (flexible), e.g. H05V-F for PVC, is preferable and is likely to reduce issues with 'bullets' on cabinet doors.

    Side panels appear to be less of an issue with Class 2 stranded conductors.

Children
  • +1 in reply to gkenyon

    Link reliability generally depends also how the wire is routed. it is bad for EMC, as the link is longer, but good for reliability, if the wire follows the axis of the line between the hinge pins  for a few inches, as that converts a folding hinge-like flexing at a point into an axial  torsion of the cable, distributed  over a reasonable length, which is a lot less stressful, both for the cores and the terminations




    In terms of recovering  EMC performance there is finger stock or metal braided gasket material.

    Mike.

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