Steel Table

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What are the reasons why sometimes when a person touches the chiller and touches the steel table...?

What are the reasons why sometimes when a person touches the chiller and touches the steel table... he feels a little shock? Is there a problem with the insulation of the chiller? the electrician suggests to install a ground in the two prong outlet (220V), but I still believe that there might be a problem with the chiller itself. Pls enlighten me. Thanks!
I just found out that the reason for the little shock is due to the compressor which needs to be replaced.

It might not be an insulation failure but rather inductive coupling which you can't do much about and is there from day 1. It is possible that the shock you feel is below the levels considered unsafe. Alternatively, it might not, and, yes, it could be due to failing insulation.

Here in the US, any electrical appliance that has a metal case is required to be grounded (or earthed in UK terms), which will drain off minor charges. Also, in the event that insulation fails significantly and allows a "hot" wire to energize the case, the ground wire provides a path for current to flow (safely) which in turn allows the circuit breaker or fuse to trip and de-energize the circuit. So grounding metal cases is a very-good practice. And it is required here due to the safety aspect that it provides.

So our appliances might have a small amout of leakage, but we never detect it via touch.

Back in the 30's and 40's a lot of portable power tools, such as drill motors, were manufactured with metal cases and two-wire cords (no ground wire). There were many instances where the wire would fray, make contact with the metal case, and electrocute the worker holding the tool. Laws were changed to require a ground wire (3-wire) on those tools, or to provide double-insulation, which means two layers of plastic between the live parts and the exterior case that the user holds.

Anyway, add a ground wire. You could also install a ground fault circuit interrupter (GFCI) that will sense current escaping via unintended paths (eg, through you) and will trip the circuit (de-energize it).

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