What times are those? If you are working live then you will be following a very detailed plan of the work written specifically for the task and will be using temporary insulation, fully insulated tools etc and wearing suitable fire resistant
clothing, arc shields etc. None of this makes safe isolation a 'little bit obsolete'
Anyway, I thought you said earlier you only do domestic? There's never a need to work live in domestic work!
Working live is only really going to be considered when paying out the compensation for killing someone is cheaper than the loss of profit from shutting down production.