Stratocaster Senior Member Joined: 15 Apr 2011 Posts: 12 Location: Port Elizabrth South Africa Expertise: Professional
Espresso: Breville 900d Grinder: San Marco Vac Pot: No Drip: No Roaster: No
Posted Mon Dec 10, 2012, 11:49am Subject: Re: Electrical shock from machine
You are getting a shock because of (a) there is an electrical leakage taking place via a leakage path that can be a very high Impedance, or very low which can be lethal. (b) You have no earth wire to divert the leakage to earth instead of via you. Unless double insulated, ie a plastic casing, any electrical device running off of the mains should have a third wire for earthing the device. I was called out to look at 2 group San Marco that was supposed to be giving the staff shocks. It turned out that the San Marco was the only thing in the bar that was properly earthed, everything else was floating due to a earth wiring fault including the staff. Try an analogue meter set for 500v full scale between the casing and a known earth, if you switch through the ranges say down to 20 volt full scale and the needle stays in the same place, it is a leak via a high impedance. If the needle flies of the scale you've been very lucky !. Franko
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