What does 30mA mean on RCD?

A 30ma RCD trips when 30ma of current is “missing.” In some locations, a 30ma trip is the maximum allowable for personal protection, prevention of electrical shock injuries. RCD / GFCI are especially important in bathrooms because people are in contact with water and pipes, which increases electrical hazards.

Whats the difference between 30mA and 100mA RCD?

A 30mA RCD will save the majority of people in most circumstances when they come into contact with an energised part of the installation. A 100mA device in the same scenario will save less. The operating characteristic of a 30mA device is designed to be just on the survivable side of the current vs.

What’s more sensitive 30mA or 100mA?

1 Answer. Yes, 30mA is safer than 100mA. 10mA, the lowest standard size, is safer still. The actual device used depends on what is being protected, what it’s being protected against and the regulations applying to the location where it’s being used (both in terms of country, state etc.

What does 30mA mean on a circuit breaker?

30ma refers to the rated current leakage circuit breakers, if the leakage exceeds the rated leakage current leakage circuit breaker will trip.

When should a 100mA RCD be used?

The manufacturers seem to be saying that 30mA RCD protection is preferable but 100mA is acceptable if nuisance tripping occurs. So you would be complying with their instructions. The manufacturers seem to be saying that 30mA RCD protection is preferable but 100mA is acceptable if nuisance tripping occurs.

When would you use a 30mA RCD?

For shock protection the RCD is required to limit that time to 40ms (40 milli-seconds) or less. A typical 30 mA RCD will trip if it detects an earth leakage current flow of around 18-22 mA causing the RCD to operate and cut of the electrical supply to prevent a fatal shock.

How does differential circuit breaker work?

Differential circuit breaker It works in conjunction with the earthing of all the elements of the installation. If, for example, we were to come into contact with any part of the installation and suffer a shock, the output current would be lower, activating the circuit breaker that would cut off the current.