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Milliamp dangersLess than 1/2 milliamp no sensation

1/2 to 2 milliamps Threshold of perception

2 to 10 milliamps muscular contraction

5 to 25 milliamps painful shock (may not be able to let go)

Over 25 milliamps Could be violent muscular contraction

50 to 100 milliamps Ventricular fibrillation

over 100 paralysis of breathing. You can see above, if the circuit was not disconnected the damage that milliamps currents can cause. 2 to 10 milliamps will cause muscular contraction but the circuit is opened in 1/40th of a second so that no damage will be caused. The electronic metering of the current at a level of 5 milliamps (.005 amps) was picked by convention as a safe level to trip the breaker. If there is a difference of 5 milliamps of the current entering the circuit and leaving the circuit, the logic states that the current must be going some place else which could be detrimental to someones health, so the breaker shuts off the current to the load.

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Q: Why is a GFCI receptacle set for 5 milli-Ampere?
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Related questions

How many amps does gfci trip at?

GFCI receptacle are designed to trip on 5 milliamps.


How do you wire dual switch-plug gfci which has extra wires?

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Can you feed multiple outlets to one GFCI outlet near the sink?

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Can a difference of 5 milliamperes for 30 milliseconds trip a gfci?

Yes it can.


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Charge = (current) x (time)Time = charge/current = 15/0.005 = 3,000 seconds = 50 minutes .


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