Thomas McKenzie asks a question about the IP ratings of switchboards within water mist (fire suppression) areas. It has been answered by SELECT (Theme – Regulations & Legislation):
Question: Where areas are to be protected by water mist fire suppression systems (as an alternative to conventional sprinkler systems), does this have an impact on the IP rating of any electrical distribution equipment contained within the area?
For standard sprinkler system applications, I would generally specify IP44 as a minimum for switchboards unless a risk assessment or specific requirements result in the need for a higher protection rating (with CO2 injection points for suppression within the switchboard enclosure.
However, as the water mist does not appear to be considered in the IP rating standard (BS 60529), and I cannot find any other guidance on the protection of ingress of water mist, I am unsure whether this method of suppression will result in internal damage and/or significant levels of condensation forming on the components/terminals/busbars within IP44 rated equipment.
Any relevant references or considered view would be appreciated…
Answer: There is no requirement, although we've noticed that you may be talking about shipboard equipment, which is outside the scope of BS7671:2008 (2011).
Complying with BS 60529 as you suggested and coordinating with the design specification would satisfy.
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