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Electrical connections
8.3 Connecting the power supply
Ensure that:
• no cables of different cross-sections are connected to
the same power supply terminal block (loosening of the
power supply wires could cause overheating)
• terminal block screws are not over-tightened
• an earth leakage breaker and a fuse or magnetothermic
circuit breaker are connected to the supply line.
8.3.1 Single-phase units 8.3.2 Single-phase units with electrical resistance
L
N
L
N
Main power supply
L
N
Backup heater
L
N
A
A
B
L
N
B
L
N
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