Tunnel Lighting Cable Sizing Calculation

For a tunnel boring operation, I have lost a method to calculate the cable size for such a long tunnel - say 3mile length; where there are light fittings periodically along the length of the tunnel, installed as the tunnel excavation proceeds boring from one end only. Any one have something? Regards

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John McLean
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What happened to "OHMS LAW"?? At 3 miles, you might have to figure on a high voltage trunk and some step down transformers. Does this have to meet some MSHA safety codes? Maybe you do need a consultant.

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