When dealing with tunnels, one must understand the definition and understand the electrical requirements that are both required and needed in these areas.
Residential load calculations first appeared in the Canadian Electrical Code Part I (CE Code) in the second edition dated 1930.
All you need to do is speak with someone who has survived an arc flash event or look at the statistics to understand the magnitude of impact these events have on not only that person who may have survived but also on everyone else either directly or indirectly involved; at work and at home.
In doing so, we will not cover every section of Article 250, but concentrate on those that are used most commonly by multi-trade inspectors.