Crosswords1 min ago
RCD cons. unit
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Anyone know if these devices react fast enough to prevent electrical fire?
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That isn't the purpose of them.
RCDs trip when there is a mismatch between the live and the neutral return path of more than 30mA - caused when there is a leakage of current to earth.
Most fires are caused by a current overload in the cables - causing overheating. This is prevented by MCBs (or fuses) to protect against excessive current flow. However if there is no leakage to earth, an RCD will still not trip - even on an overloaded circuit.
RCDs trip when there is a mismatch between the live and the neutral return path of more than 30mA - caused when there is a leakage of current to earth.
Most fires are caused by a current overload in the cables - causing overheating. This is prevented by MCBs (or fuses) to protect against excessive current flow. However if there is no leakage to earth, an RCD will still not trip - even on an overloaded circuit.
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