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Underfloor Bus Bar Systems

Bob Cowie
The Definition in the Regulations for a Socket states " A Device, provided with Female Contacts, which is intended to be installed with the fixed wiring, and intended to receive a plug. A Luminaire track system is not regarded as a socket-outlet system"

From the above it would be my understanding that the Tap-Offs on an underfloor Bus Bar system are considered to be sockets. The exclusion of Luminaire track systems also appears to support this viewpoint as it infers that power Underfloor Bus Bar should be classed as sockets.
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    BS7671 does handle this. you turn it into a risk assessment.  You say (to paraphrase slightly)


    Risk assessment 001
    Nature of risk

    1) There is a potential risk from folk plugging random equipment into this bus bar, as there is  no RCD protection.

    2) There is also a risk if the bus bar is damaged in a way that a live core is exposed .
    if unmanaged the risk of injury is moderate.

    Management of risk


    To mitigate this risk,.

    1) We will not allow random equipment to be connected to the non RCD bus bar, and

    2) Those carrying out building works involving cutting or drilling near the bus bar shall check with  authorised persons before proceeding.

    3) We shall put labels to that effect on any unused points of termination and places where the bus bar is easily accessible.

    4) Only a small selection of skilled staff are authorized to have access to the bus bar, and they shall be qualified to decide when to include an RCD with the equipment.

    I understand on the basis of the evidence presented to me that the residual risk after the

    above mitigation measures have been put in place is negligable.


    Insert near illegible signature of company director and / or company health and safety officer.




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  • 0
    BS7671 does handle this. you turn it into a risk assessment.  You say (to paraphrase slightly)


    Risk assessment 001
    Nature of risk

    1) There is a potential risk from folk plugging random equipment into this bus bar, as there is  no RCD protection.

    2) There is also a risk if the bus bar is damaged in a way that a live core is exposed .
    if unmanaged the risk of injury is moderate.

    Management of risk


    To mitigate this risk,.

    1) We will not allow random equipment to be connected to the non RCD bus bar, and

    2) Those carrying out building works involving cutting or drilling near the bus bar shall check with  authorised persons before proceeding.

    3) We shall put labels to that effect on any unused points of termination and places where the bus bar is easily accessible.

    4) Only a small selection of skilled staff are authorized to have access to the bus bar, and they shall be qualified to decide when to include an RCD with the equipment.

    I understand on the basis of the evidence presented to me that the residual risk after the

    above mitigation measures have been put in place is negligable.


    Insert near illegible signature of company director and / or company health and safety officer.




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