Internal Equipotential Bonding In The Auxiliary Terminal Box; Terminating The Connection Work (Auxiliary Circuit) - Siemens SIMOTICS HV C Operating And Installation Instructions

Electrical connection
6.4 Connecting the auxiliary circuits
6.4.8

Internal equipotential bonding in the auxiliary terminal box

The equipotential bonding between the PE terminals in the relevant auxiliary terminal box
enclosure and the machine enclosure is established via a fixing bolt in each auxiliary terminal
box enclosure. The contact point underneath the bolt head is bare metal and protected against
corrosion.
Ineffective equipotential bonding
If the equipotential bonding connection fails, parts of the machine may become live. If you
touch them, you will receive an electric shock. This can result in death, serious injury or
material damage.
● When performing any installation work you must always take care to ensure that all
6.4.9

Terminating the connection work (auxiliary circuit)

1. Before closing the auxiliary terminal box, please check that:
2. Close the auxiliary terminal box using the cover supplied for this purpose. See section
68
WARNING
equipotential bonding connections remain effective.
– The cables are connected in accordance with the terminal diagram.
– The cables are freely arranged so that they cannot come into contact with the machine,
and the cable insulation cannot be damaged.
– The inside of the terminal box is clean and free of any cable debris, dirt and foreign
bodies.
– The cable glands are firmly tightened, are suitable with respect to the degree of
protection, type of cable routing, permissible cable diameter, etc., and have been
mounted in full compliance with specifications and regulations
– The threads in the connection plate are sealed using cable and conductor entries, thread
adapters or sealing plugs that achieve the respective degree of protection.
– Unused cable entries are sealed. The sealing elements are firmly screwed in, and can
only be released using a tool.
– All of the seals/gaskets and sealing surfaces of the terminal box are in good condition
– The screws of all of the screw clamps are fully tightened, even if they are not being used.
"Tightening torques for screw and bolt connections (Page 113)" for the tightening torque of
the fixing bolts for the cover.
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018