Posted By Raj I am looking for guidance on the above topic. We use 400 Volt while commissioning Elevators and Escalators. Please forward any useful material to my email. Thanks and warm regards raj

Posted By George Wedgwood Specifically Raj, have a read of HSE Guidance on 'Electricity at Work - Safe Working Practices' (HSG 85) and the assessment process for working live or dead. That must be followed for compliance and some expertise in managing electrical risks will be necessary beforehand. It does not really matter whether you are working with 400V or 50v, the assessment process should be the same and all servicing is best done dead. Commissioning is of course, live but the conductors should be screened or enclosed, even if this means temporary screening or enclosures whilst proving circuits. You cannot simply accept that no one will touch live conductors because they are 'clever' and aware of electrical risks! I have seen experienced electrical workers killed because they though they were clever enough to avoid the dangers and assessment will, in every case, help provide solutions to controlling against such risks, to ensure that working live is 'reasonably practicable' and working dead is unreasonable. Control measures for working live can include rubber gloves, screening of adjacent live circuits whilst commissioning a live one with insulated tools etc.