Discuss Automatic disconnection of supply in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
An RCD most certainly does NOT limit the current. It can't - the current is a product of Ohm's Law. It merely limits the duration if operating correctly.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:
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.
- Preventing a current passing through the body of any person or any livestock
- Limiting the current which can pass through a body to a non-hazardous valve
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:
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.
- Preventing a current passing through the body of any person or Limiting the current which can pass through a body to a non-hazardoany livestock
- us valve
I have already pointed out why you haven't met the requirements of that Regulation with an RCD so how is it flawed?Flawed argument we have either achieved basic protection or we havent, and if we haven't then the regulation 131.2.1 is nonsense
Where does Regulation 131.2.1 state or even imply that an RCD provides basic protection?Because by definition basic protection stops the flow of current and also by definition an RCD provides basic protection regulation 131.2.1 says it does,
Electrical separation is in no way comparable to an RCD. This gives us two phase conductors with no neutral or Earth reference.How about electrical separation can this afford basic protection
But I don't accept that it is in any way ambiguous. That's why I am asking where precisely you believe that the Regulation in question supports your claim.Don't get me wrong I totally understand the principle I'm simply pointing out the ambiguity of the regs
Limiting the time isn't the same as limiting the current, though, which is what the Regulation stipulates.By time limited fault duration
No they don't. Ohm's Law is what you need.fault currents start at zero and climb in a time curve
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:
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.
- Preventing a current passing through the body of any person or any livestock
- Limiting the current which can pass through a body to a non-hazardous valve
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:
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.
- Preventing a current passing through the body of any person or any livestock
- Limiting the current which can pass through a body to a non-hazardous valve
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:
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.
- Preventing a current passing through the body of any person or any livestock
- Limiting the current which can pass through a body to a non-hazardous valve
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.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
Depends if you got any leakage to earth, failing that it would do nothing
Fair point no protectionOk lets for the sake of this stupid thread lets presume theres no leakage, except in his y fronts
To protect human life.I see so what's the point of that level, 30mA
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.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.
Tells me nothing I don't already know
Wise because I'm a firemanMust remind myself not to call you if I need electrical work doing.
Imagine you’re outside mowing your lawn with your hover mower.Well I would like to know the science behind how it saves your life if it doesn't limit the current your body receives
Reply to Automatic disconnection of supply in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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