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Question about BS EN 12101-6:2005, art. 11.6.3

Julien Leblanc
The article 11.6.3 in BS EN 12101-6:2005 states the requirements for electrical cables used in pressure differential systems:

    a) fire-resisting cables meeting the temperature and time criteria in accordance with Table 7 or

    b) enclosed with fire-resisting construction, or installed external to the building where the cables cannot be endangered by fire, and

    c) cables protected from fire shall comply with the classification temperature/time of the component that they serve.


I'm reading again and again and I'm still not sure if the conditions should be met as follows:

    1. ( a or b ) and c

    2. a or ( b and c )

Please help.
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  • 0
    a or (b and sometimes c)


    because the first option is to have fire-resistant cables, which comply with the requirements of table 7 - i.e. they can withstand temperatures of 300°C to 600°C


    the second option is to protect the cables (b1) or site them where they will not be exposed to fire (b2)


    if the cables are protected (b1) they must be at least as durable as the component which they serve - e.g. a fan; but if the cables cannot be exposed to fire, they don't in fact need to be fire-rated at all.
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  • 0
    a or (b and sometimes c)


    because the first option is to have fire-resistant cables, which comply with the requirements of table 7 - i.e. they can withstand temperatures of 300°C to 600°C


    the second option is to protect the cables (b1) or site them where they will not be exposed to fire (b2)


    if the cables are protected (b1) they must be at least as durable as the component which they serve - e.g. a fan; but if the cables cannot be exposed to fire, they don't in fact need to be fire-rated at all.
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