Plug-in Galvanic Isolator from The Galvanic Isolator Company

[lustyd]

Of course the leak is to earth, my point was it’s not always through the earth wire in dangerous situations so the RCD doesn’t play with that wire.

 

[Alex_Blackwood]

Yes, but more often than not it's a leak to Earth that causes the imbalance, in which case the warning light on the GI will illuminate, or it would if there was no RCD.

I don't like products where they waffle about so called benefits, that aren't actually benefits in the real World.

I have had a look at the sales pitch and also another GI producer. Who copied from whom? Just a lot of smoke and mirrors. They don't tell untruths but a lot left to misinterpretation. I think the term Galvanic when applied to protection is just a wide catch which include s Electrolytic, probably for the layman's benefit.
A GI will not prevent or protect against electric shock . Neither will it have any effect on the operation of safety devices such as RCD's or MCB's. It will not prevent Galvanic action, Electrolytic yes . When fitted as recommended between the shore supply inlet and the CU it will only block stray leakage currents in the shore supply system. It will not stop leakage to the boats earth connection arising from the boats installation. Gi's have, as basic construction, Four Diodes in series/ parallel, two in series pointing in one direction and two the other. Depending on the diode this will block any voltage below the value of somewhere around 0.9 - 1 volt. anything above that ac or DC will pass through. It is worth noting that every electrical installation will have leakage to some degree. This can arise from poor insulation, Inductive or Capacitive coupling, electronic devices or poor design or installation. This leakage can be, ac, pulsing DC or smoothed DC. Hence the recommendation to now fit Class "A" or even "B" RCD's as these offer protection from saturation caused by the DC component. The 18th edition regs. only allow, on installation, leakage of less than 30% of the protective device. i.e. a system protected by a 30 Ma RCD can only have 9Ma max. leakage.
Sorry if that is a bit long winded. first couple of lines are the important bit.

 

[VicS]

>
A GI will not prevent or protect against electric shock . Neither will it have any effect on the operation of safety devices such as RCD's or MCB's. It will not prevent Galvanic action, Electrolytic yes .
>
The 18th edition regs. only allow, on installation, leakage of less than 30% of the protective device. i.e. a system protected by a 30 Ma RCD can only have 9Ma max. leakage.
Sorry if that is a bit long winded. first couple of lines are the important bit.

Other way round
A galvanic isolator will protect against galvanic action ( ie that caused by dissimilar metals ), It will not protect against electrolytic action caused by leakage from higher voltage sources.

mA

.

 

[Alex_Blackwood]

Other way round
A galvanic isolator will protect against galvanic action ( ie that caused by dissimilar metals ), It will not protect against electrolytic action caused by leakage from higher voltage sources.

mA

.

Getting my Cathodics, Galvanics and Electrolytics all confused. It is A.G.E. related! I knew what I meant, honest!