Summary

Insufficient Containment Spacing - Bends and Tees

<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/8df95945-0479-497e-a150-8710961a5012/empty.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/8df95945-0479-497e-a150-8710961a5012/empty.png" width="40px" /> Successes:

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/a02c7a88-0b5b-40df-921e-d30b179c1f1a/empty.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/a02c7a88-0b5b-40df-921e-d30b179c1f1a/empty.png" width="40px" /> Challenges:

• in specific areas (identified on an individual basis), i.e. containment junction or bend or Tee more space is required between the bends - specifically check 45deg bends as they raise the risk more than other types

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<aside> <img src="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/d6831872-e8fb-4fc5-9536-50db7b9d9822/empty.png" alt="https://s3-us-west-2.amazonaws.com/secure.notion-static.com/d6831872-e8fb-4fc5-9536-50db7b9d9822/empty.png" width="40px" /> Recommendations:

• keep the distance at least 100mm - if this is not possible and the clearance is smaller, make a greater effort to communicate the design intent and potential risk by adding extra annotations to the drawings and dimensions
• Combining containment route shall comply with HTM clause 11.34 "Signal and telecommunications cables should not be run in the same tray as power cables. Table 13 indicates the separation distances between power and signal cables, where the cables are not screened or screened at their respective voltage level. This will have to be specifically raised with the client for a derogation acceptance.
• 50mm segregation to be provided between band 1 and band 2 cables as on the BS 7671 recommendation

Key Takeaways:

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