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Waveform neutral

lyledunn

Two relatively long 300mm2 3-core Waveform  cables in ducts below ground supplying an industrial building. Currently the cables belong to the DNO but the contractor has permission to adopt them into a new proposed 1MVA PV/battery arrangement if he so wishes. The conductors are configured as three lines in parallel, outer copper wire screen in one cable as neutral and earth in the other. 

Its not a good start with the reduced neutral and plenty of machine control in the plant but no issues apparent. Parameters for normal design procedure are not yet clarified as everything is at an early stage but I was just wondering about the BS7671 perspective. I have never used the cable as it is generally for DNO application. The cable cannot be touched at any point other than at both ends.

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    You are right, Graham, there is a short section entering the trough below the intake panel. As I understand it, the cable is staying or the project stands a good chance of being shelved.

    It is important to look after the safety of skilled persons. Whilst the proposal may not fully comply, I would think that reasonably robust mitigation could be put in place.

    There are some countries that are not so cautious with dangers posed to skilled persons: 

  • 0 in reply to lyledunn

    Actually there are a still a few 'skeleton frame' substations in the UK that have the LV bars exposed. 

    But that is OK as it is on the DNO side where electricity is safer, and neutral is considered to be earth-like.

    Actually more seriously they are being upgraded, and meanwhile rubber sheet mats are used to reduce the risks from direct contact when folk have to be in there, which is organized to be minimally.

    Mike.

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  • 0 in reply to lyledunn

    Actually there are a still a few 'skeleton frame' substations in the UK that have the LV bars exposed. 

    But that is OK as it is on the DNO side where electricity is safer, and neutral is considered to be earth-like.

    Actually more seriously they are being upgraded, and meanwhile rubber sheet mats are used to reduce the risks from direct contact when folk have to be in there, which is organized to be minimally.

    Mike.

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