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Old Distribution Board and Present Certification

Les Spiteri
Recently we have been asked to install new cabling from an existing DB board (which is very old BS88 style fuses). I have been told that in order to certify the work then we have to change the DB board.
  • Is this absolutely correct, are there circumstances where you can add cables(s) to existing DB board and ensure your work/modifications are 18th Edition compliant?

  • Otherwise when cabling for new kit was required then installations would have to change DB boards on regular occurrences.

  • I would imagine there are circumstances that this would be deemed not realistic or practicable (which seems to be the expression used).


On this occasion its a 3ph DB board.


Could any of you comment on your experiences in this area please?
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    The basic rule of additions is that only the new work has to comply with the current regs, but that the new work mustn't be "lessened" by the old work. So for example adding a new socket to an existing non-RCD circuit wouldn't comply. Conversely, replacing a DB doesn't mean all the downstream circuits must suddenly comply with BS 7671:2018 (644.1.2)
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    The basic rule of additions is that only the new work has to comply with the current regs, but that the new work mustn't be "lessened" by the old work. So for example adding a new socket to an existing non-RCD circuit wouldn't comply. Conversely, replacing a DB doesn't mean all the downstream circuits must suddenly comply with BS 7671:2018 (644.1.2)
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