Answers to the following questions please - will be appreciated: 1) In confined space work why are lighting circuits seperate from circuits used for tools/equipment? 2) In confined space work are all electrical tools/equipment including lighting required to be low voltage (25 volts or less)? 3) When using tools in confined space work should the user insulate himself from ground paths? 4) In confined space work are double insultated tools prefered over appliances with a grounding conductor?

Thank you gentlemen for your expertiese.