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Requirement of gaskets for BESA or universal box.

Mirak

Please help me to get clarification on the below statement. Is it a requirement according to the BS7671 and Buiding Regs? 

"Where conduits pass through fire-rated ceilings and walls, it is a requirement to terminate each side with a BESA or universal box fitted with intumescent gaskets to stop fire penetrating. It is also a requirement to fit intumescent gaskets in the back of metal switch/socket boxes where they are back-to-back and cables pass through the wall."

Parents
  • 0

    It can also depend on the size off the conduit - BS 7671 says that conduit/trunking with an internal cross-section up to 710mm² (with a few other conditions) need not be sealed internally - see 527.2.3.

    If you did have to seal then a round box seems like a sensible way of achieving that, while maintaining accessibility for future maintenance.

    More draconian demands can of course be introduced as customer requirements - wiring & building regs are normally regarded as minimums rather a mandatory  uniform solution. The customer can always get "better" if they pay for it.

         - Andy.

Reply
  • 0

    It can also depend on the size off the conduit - BS 7671 says that conduit/trunking with an internal cross-section up to 710mm² (with a few other conditions) need not be sealed internally - see 527.2.3.

    If you did have to seal then a round box seems like a sensible way of achieving that, while maintaining accessibility for future maintenance.

    More draconian demands can of course be introduced as customer requirements - wiring & building regs are normally regarded as minimums rather a mandatory  uniform solution. The customer can always get "better" if they pay for it.

         - Andy.

Children
  • +1 in reply to AJJewsbury

    So about 30mm diameter?

  • 0 in reply to AJJewsbury

    Thank you, Andy, found the text in BS7671. If there is no requirement of putting sealing for conduct less than what is mentioned in the regs then don't want to over-engineer it. 

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