Siemens SIPLUS HCS Series Operating Instructions Manual page 72

Connecting
6.1 Safety information and guidelines
Electric shock hazard
May cause death or serious injury
• Voltages of more than 60 V can occur in the control cabinet. Suitable safety precautions
• Before working on the heating control system or the connected components, ensure the
High levels of leakage current
Risk of injury
Before connecting the device to the supply system, you must connect the grounding circuit
(see Section Connecting the protective conductor (Page 71)).
Connection requirements
● The device has been mounted.
● The mains supply is disconnected at the mounting location of the device and secured
against reconnection.
● The line voltage is secured by an easily accessible isolating mechanism.
It is recommended that the external disconnecting means is located close to the device.
● The cables to be connected are not live.
70
WARNING
preventing contact must therefore be taken during commissioning and maintenance
work.
system is disconnected.
CAUTION
SIPLUS HCS4200 PROFINET/PROFIBUS DP
Operating Instructions, 07/2019, A5E35066204A/006