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A 3-core cable was installed to supply a DC UPS system and it was realised they actually needed a 4-core cable , 3 phase & neutral.
To overcome this oversight” they are proposing to install a local autotransformer of vector group Zn0 to generate a neutral for the load. The “new” neutral will not be earthed at this point however the source where the 3-phase eminates from is a 415v transformer with solidly earthed star point.
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