Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This Question of the Day, concerning conduit and minimising the spread of fire, is answered by BASEC:
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| What minimum size of conduit? |
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Question: With reference to Section 527 BS7671: 2008 (the 17th Edition), 'minimise the spread of fire', I understand that there is a minimum size of conduit that requires internal sealing to prevent the spread of fire.
What is this size? Also, where can I find that size stated in the Regulations?
Answer: See clause 527.2.6 on page 108.
Under clause 527.2.6, suitable conduit of maximum internal size 710mm2 does not need to be fire stopped if it complies with specific requirements. The size equates to a square of 26mm by 26mm, or a diameter of 30mm.
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