One for westie?

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Went to price a job at a small industrial unit today and came across this rather unusual supply setup. There's two TP heads. The one with the meters appears to be fed with a looped waveform supply, the the second head has a SWA cable into it.

Anyone have any ideas why there would be two heads?
 
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Why is the second Service Fuse Header Unit installed Upside Down?
 
I wondered if it's a submains but there unit is small and it certainly doesn't supply anything internal. Our only thought was if it feeds an adjacent unit. Unfortunately we didn't get chance to remove any covers and investigate further.

No idea why it's upsidedown but not the first time I've seen cutouts in funny orientations
 
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Looks to me as if the SWA is a submain from another building which fed this one. Then things got split up and a a new DNO service got installed. Then the private meter got removed and connected through with henleys.
 
Went to price a job ?

A board change, I presume. http://dormansmithswitchgear.com/wp/downloads/discontinued_products/mcb/loadmaster_mcb_datasheet.pdf

Unless the zs is low enough to hit the mag trip on them, then you are left relying on the thermal trip which has worse charactoristics than a 3036 fuse!

360A will cause a 30A device to take disconnect in 0.4 seconds = an I²t of 51,840. Assuming copper conductors in 70C PVC that equates to a min cpc size of 1.97mm². So not kind to ring circuits in twin and earth. especially so 2.5/1.0 cables which were being installed around the same time as these boards!
 
Yeah a board change was part of the work. Not seen one of them dorman smiths for a few years now!

It could well be redundant, although it sounds like our price was too high so we may never know :(
 
Wonder if it was one of the ones I periodiced a few years ago? They seemed to be a favourite in older co-op's!
 
Different!
Is the cable going/coming (?) from the upside down cut-out the same as one of those in the cut-out below the meters?

(p.s. been on hols so late replies everywhere)
 
Different!
Is the cable going/coming (?) from the upside down cut-out the same as one of those in the cut-out below the meters?

(p.s. been on hols so late replies everywhere)

No the right way up cutout looks to be waveform concentric looped supply. The upside down one is fed in SWA with a larger outside diameter. All three cables disappear into the concrete floor in the same place.
 

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