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Recently we have carried out the periodic inspection in a manufacturing plant. This plant has a 6.6kv network supplying 3 remote buildings each with transformers. We found that the Zs readings throughout the installation in one of the buildings were high compared to previous inspection reports.
On speaking to the Site Engineer he informed me that they had a fault on the 6.6kv feeder cable to that particular building. The cable had blown but along side the MV cable was a supplementary earth which he feels may not of been repaired.
This then made me think that the earth and neutral were not strapped on the LV side of the transformer.
On further iinspection the neutral earth link had been left in the open position on the live side of the main switchgear.
My question is is there anty reason for this or is it an oversight from the electrical contractor who installed the original supply?
Looking forward to your comments.
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