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BS7671 422.4 Combustible Construction materials

Michael Fox

I am trying to better understand the requirements of BS7671 in relation to practical installation of wiring in an timber outbuilding.  422.4.201 states that Electrical equipment (boxes etc) installed on or in a combustible material shall comply with the relevant standard for enclosure temperature rise. Can anyone help me understand what that standard is? I can't find any further information that helps me understand what is needed to be compliant. Is there a particular product approval that would mean this is satisfied?

I would appreciate any help in this.

Thanks

Mike

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  • +1

    I'm happy to be corrected, but I'd read that simply as the normal standard for that kind of equipment - e.g. BS EN 61439 for DBs or BS 5733 for a surface back box.. (Unlike some of the older kit - e.g. open backed fuses boxes - which were only intended to be fixed to non flammable surfaces). It's probably just duplicating the normal requirements but reinforces the point if someone's going down the 'equivalent level of safety' deviation route.

      - Andy.

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  • +1

    I'm happy to be corrected, but I'd read that simply as the normal standard for that kind of equipment - e.g. BS EN 61439 for DBs or BS 5733 for a surface back box.. (Unlike some of the older kit - e.g. open backed fuses boxes - which were only intended to be fixed to non flammable surfaces). It's probably just duplicating the normal requirements but reinforces the point if someone's going down the 'equivalent level of safety' deviation route.

      - Andy.

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  • 0 in reply to AJJewsbury

    Thank you. That does make sense. A quick Google of both of those BS's does reveal that temperature rise is one of the factors that should be considered in the design and testing. I guess that as long as I ensure all components are to the relevant  BS for the type, I should be OK. It does go on to define the BS for cables, conduit and trunking. It is only the electrical equipment section that is a bit vague. 

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