Supervisor of a firm I worked for many years ago kept being called to a lady's hairdressers , occasionally getting shocks & tingles from equipment etc.
Rented property on 1st floor , this phenomenon kept recurring .
Eventually traced to a lead sink waste pipe going outside to a hopper head on a downpipe which shared with next door's plumbing . Next door had serious earthing problems apparently and caused problems in the hairdressers only when both properties released water from sinks and it mixed at the hopper head.
Rented property on 1st floor , this phenomenon kept recurring .
Eventually traced to a lead sink waste pipe going outside to a hopper head on a downpipe which shared with next door's plumbing . Next door had serious earthing problems apparently and caused problems in the hairdressers only when both properties released water from sinks and it mixed at the hopper head.