Basic rules
The cross-section and length of the cables must be suitable for limiting the voltage drop to less than 3% at the end of the line in steady state.
The In rating of the standard protection and control switchgear must be far higher than the rated current of the lighting circuit:
for the circuit breaker, take approximately twice the rated current of the circuit,
for the relay, always use the compatibility tables for each type of lamp and check
that its rating is always higher than that of the upstream circuit breaker (short circuit coordination).
The In rating of the earth leakage protection device must be greater than or equal to that of the upstream circuit breaker.
