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Group 1 Medical Location - supplementary bonding - use of junction boxes

Simon Bourke

For the supplementary bonding connections connecting the general power sockets served by the general power circuit  is it permissible to have a junction box installed (in a ceiling void) prior to the EBB in a group 1 medical location to reduce resistance value of the circuit?

See image below for typical arrangement:

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    Whilst electrically this might make sense, the wider question is in terms of regular inspection and testing ... in which case, infection control and other practicalities come into the mix. Some of these are CDM, some are healthcare (infection control).

    In this case, whilst 710.415.2.3 relates to the EBB itself, it also contains a clue that things requiring regular inspection and testing (at the frequency of the equipotential bonding system) should NOT be above a ceiling because of infection control issues when removing tiles for inspection and testing. So, because the inspection of the bonding system would also include these junction boxes, the answer would be "forget BS 7671, other practicalities say NO".

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    Whilst electrically this might make sense, the wider question is in terms of regular inspection and testing ... in which case, infection control and other practicalities come into the mix. Some of these are CDM, some are healthcare (infection control).

    In this case, whilst 710.415.2.3 relates to the EBB itself, it also contains a clue that things requiring regular inspection and testing (at the frequency of the equipotential bonding system) should NOT be above a ceiling because of infection control issues when removing tiles for inspection and testing. So, because the inspection of the bonding system would also include these junction boxes, the answer would be "forget BS 7671, other practicalities say NO".

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