Automatic disconnection of supply

[rich3009]

Why do we have a 30ma RCD if the result is a pass through of a massive current, it would make a mockery of it

 

[Amp David]

I know it's not true but based on that reg alone it states :

Basic Protection
Persons and livestock shall be protected against dangers that may arise from contact with live parts of the installation.

This protection can be achieved by one of the following methods:

1. Preventing a current passing through the body of any person or any livestock
2. Limiting the current which can pass through a body to a non-hazardous valve

Now taking that to the letter without referring to any other regulation an RCD does exactly that, this is a very poorly written regulation and would afford you great defence in court.

What would your rcd do if you decided to prod at line and neutral?

 

[Amp David]

I know it's not true but based on that reg alone it states :

Basic Protection
Persons and livestock shall be protected against dangers that may arise from contact with live parts of the installation.

This protection can be achieved by one of the following methods:

1. Preventing a current passing through the body of any person or any livestock
2. Limiting the current which can pass through a body to a non-hazardous valve

Now taking that to the letter without referring to any other regulation an RCD does exactly that, this is a very poorly written regulation and would afford you great defence in court.

What would your rcd do if you decided to prod at line and neutral?

 

[Amp David]

I know it's not true but based on that reg alone it states :

Basic Protection
Persons and livestock shall be protected against dangers that may arise from contact with live parts of the installation.

This protection can be achieved by one of the following methods:

1. Preventing a current passing through the body of any person or any livestock
2. Limiting the current which can pass through a body to a non-hazardous valve

Now taking that to the letter without referring to any other regulation an RCD does exactly that, this is a very poorly written regulation and would afford you great defence in court.

What would your rcd do if you decided to prod at line and neutral?

 

[rich3009]

Depends if you got any leakage to earth, failing that it would do nothing

 

[Risteard]

Why do we have a 30ma RCD if the result is a pass through of a massive current, it would make a mockery of it

It means that it will operate if there is a nominal 30mA earth fault current through it (between 0.5 and 1 times this in reality). So if you were in contact with a phase conductor and 30mA passed through your body it should operate. The 30mA rating has nothing to do with limiting the fault current to 30mA as this would defy Ohm's Law.

 

[Amp David]

Depends if you got any leakage to earth, failing that it would do nothing

Ok lets for the sake of this stupid thread lets presume theres no leakage, except in his y fronts

 

[rich3009]

I see so what's the point of that level, 30mA

 

[rich3009]

Ok lets for the sake of this stupid thread lets presume theres no leakage, except in his y fronts

Fair point no protection

 

[Risteard]

I see so what's the point of that level, 30mA

To protect human life.

It's not about limiting the current to 30mA but ensuring that it operates if 30mA is passing through - well actually 150mA for additional protection to operate within 40mS.

 

[rich3009]

To protect human life.

It's not about limiting the current to 30mA but ensuring that it operates if 30mA is passing through - well actually 150mA for additional protection to operate within 40mS.

But if the result is an instant huge fault current that starts way above that figure why have it, hence my argument that the fault current grows from zero and fast.. In milliseconds; but is nipped in the bud by the RCD before it gets the chance. Plus if your argument is true why doesn't a 500mA protect you.

 

[Spoon]

But if the result is an instant huge fault current that starts way above that figure why have it, hence my argument that the fault current grows from zero and fast.. In milliseconds; but is nipped in the bud by the RCD before it gets the chance. Plus if your argument is true why doesn't a 500mA protect you.

Electrical Safety: The Fatal Current - https://www.physics.ohio-state.edu/~p616/safety/fatal_current.html

 

[rich3009]

The RCD limits the fault current that passes through your body by breaking the fault at 30mA any higher and your in deep

 

[rich3009]

Electrical Safety: The Fatal Current - https://www.physics.ohio-state.edu/~p616/safety/fatal_current.html

Tells me nothing I don't already know

 

[The Ghost]

Must remind myself not to call you if I need electrical work doing.