Checking the installation
117
Groundings and protection
Checks for groundings and protections are listed below. Tips for installations where
EMC emissions must be minimised are given in column Extra requirements for EMC.
4.8 Connection of cables to devices and terminal blocks. Check that
• cables are connected to terminals tight enough by pulling the cable
• cable termination on terminals chaining is done correctly
• bare conductors are not too far outside the terminal causing an insufficient clearance or loss of
shielding against contact.
4.9 Cables are not lying against sharp edges or bare live parts. Bending radius of fibre optic cables at least
3.5 cm (1.38 in.).
4.10 The type, markings, insulation plates and cross connections of terminal blocks are correct.
5. Clearances and creepage distances
5.1 Clearances outside the modules are at least 12.7 mm (0.5 in.).
5.2 Creepage distances outside the modules are at least 12.7 mm (0.5 in.).
Step Check item Extra requirements for EMC
6 Groundings and protection
6.1 The grounding colours, cross-section and grounding points
of modules and other equipment match the circuit diagrams.
No long routes for pigtails
6.2 Connections of PE cables and busbars are tight enough.
Pull the cable to test that it does not loosen.
No long routes for pigtails
6.3 Doors equipped with electrical equipment are grounded. No long grounding routes. From EMC standpoint
best result is achieved with a flat copper braid.
6.4 Fans that can be touched are shrouded.
6.5 Live parts inside the doors are protected against direct
contact to at least IP 2x (if required).
Step Check item
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