What are the trip level and trip time maximums for ELCIs and RCDs?

The maximum trip level and trip time for Equipment Leakage Circuit Interrupters (ELCIs) and Residual Current Devices (RCDs) are set to ensure safety by preventing electric shock and minimizing the risk of electrical fires. The recognized standard for ELCIs and RCDs generally specifies a maximum trip level of 30 mA, which is sensitive enough to detect leakage currents that could pose a risk to human safety, while offering a balance with nuisance tripping.

The maximum trip time is specified at 100 ms, meaning that the device should interrupt the circuit within this timeframe upon detecting a dangerous level of leakage current. This prompt action reduces the duration of exposure to potentially hazardous currents, thus enhancing safety for individuals around electrical systems.

The choice of 30 mA for the trip level ensures that it effectively protects against shock without being overly sensitive, which could lead to frequent interruptions in the electrical supply for non-life-threatening leakages. The combination of the trip level and timing adheres to the guidelines established for ELCIs and RCDs, which are vital safety devices in marine and other electrical systems where water and electricity may interact.