Posted By Al Beevers I simply don't know enough about welding for this........ On site we have a blanket 110v tools policy - no 240v - for maintenance and building work. Our pipework contractors for a chiller install are telling me that they need to use a 240v welder for some thick sections of pipework as a 110v unit won't give them enough power. They're complying with the 110v rule for everything else, and are submiting an amended risk assessment for using a 240v TIG welding unit. Question is, are they telling the truth? Is there a real, technical reason they need a 240v unit for thicker pipes? I wan't to avoid all our outer sub-contractors claiming 'one rule for them, another for us' Any replies from the welding fraternity most welcome. Al.

Posted By Alan Woodage AL, Absolutely genuine request, we often use 240V or 415V welding plant. A few pointers to look out for, Ensure all 240V is protected by RCD at source, Keep the power cable to a minimum ideally plant plugged directly into the socket. If you must use extension leads ensure they are Armoured cables with the sheath earthed, and ensure all plugs have a suitable IP rating for the environment, not a 13A cable reel from B&Q or similar. If your contractor is TIG welding heavy pipe are they using Purge welding if so dont forget large amounts of inert gas and obvious asphyxiation risks. If you need any more welding advice just let me know. When that fortune teller said I would have a job involving bright lights I thought she meant the stage or films, Not as a welder.

Posted By Al Beevers Thanks to all. All hot work is done under a permit anyway, and I've discovered the joys of HSG118. Al.

Posted By Bob Thompson CMIOSH forgot to ask Alan what was your ticket? Bob