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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
John McLean wrote:

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.
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here. All logos and trade names are the property of their respective owners.