Posted By Alan Haynes Not in all confined spaces - see:- http://www.hse.gov.uk/pubns/indg258.pdf

Posted By FAH Hi Prads I'm assuming that you're working on a site in the UK? There are some clients who have done their own RAs for their exposure to the consequences of working in Confined Spaces & arrived at conclusions such as the one you quote. There is no explicit legal requirement under UK legislation to use any form of electrical system simply because it's being used in a Confined Space. However, if I was working in a metal vessel, compartment or structure where the electrical system could be sufficiently damaged that the structure could become electrically live - I would require the safest [lowest] level of electrical energy that is reasonably practicable. Additionally, many metal vessels are used in conjunction with flammable &/or explosive substances; for these i would also require the electrical system to be as low energy [& also ATEX standard] as possible. Frank Hallett

Posted By garyh My experience is that 110v lighting is often used, simply for the usual reason of avoiding 240v systems.