Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Replies 4 replies
  • Subscribers 33 subscribers
  • Views 781 views
  • Users 0 members are here
Options
You may also be interested in

Diverse routing

Steven Martin

Can anyone advise on any documentation with specific reference to diverse route distances, is there a minimum distance to keep separate LV & LSS containment when it is impossible to take them in an entirely different route ?

The example is buried ducts system for  separate a  LV and LSS Generator supplies to a building, they need to run from the TX and Generator location which are remote from the building, but have to run parallel to each other for a distance of 30/40 m as there is little option to do otherwise, can these run together with a space of 2-3m separation ? 

  • 0

    That all depends on the fire risk assessment (or if for purposes other than fire, the relevant availability risk assessment).

    The separation to achieve 'diverse' is a function of the potential causes of any given single point of failure.

    So for example if the fire, flooding, or accidental impact event that affects one cable is able to affect a cable 3 m away, that is not 'diverse' ... but if the event is highly unlikely to, or cannot, simultaneously affect both cables, that could well be'diverse'.

  • 0 in reply to gkenyon

    The guide to electrical medical locations touches on this subject. 

  • 0 in reply to AMK
    AMK said:
    The guide to electrical medical locations touches on this subject

    Agreed, although this is based on domain-specific requirements to conform to relevant HTM's. The risk assessment for other applications might lead to different decisions or approaches - more costly or less costly dependent on the requirements and considerations involved.

  • 0 in reply to gkenyon

    I agree. Referring to the original post, if diverse routes cannot be established throughout, is the optimal solution be to use cables to PH120 ? However, considering the example provided, since the cables are buried underground, the single point of failure would likely result from an impact. 

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines