WARNING!
Remove the metal VAR screw in IT systems. If you do not, it can cause danger
or damage to the drive.
Earthing systems and the need to remove EMC screw or VAR
screw
Screw materialScrew
label
IT systems (un-
grounded or high-
resistance groun-
ded) (C)
Corner-grounded
delta (B1), mid-
point-grounded
delta (B2) and
TT (D) systems
Symmetrically
grounded TN-S
systems, i.e, center
grounded-wye (A)
RemoveRemoveDo not removeMetalEMC
RemoveDo not removeDo not removeFrames R1, R3,
R4: Metal
VAR
Do not removeDo not removeDo not removeFrame R2: Plastic
D
L1
L2
L3
N
PE
L1
L2
L3
PE
L1
L2
L3
L1
L2
L3
N
PE
L1
L2
L3
PE
L1
L2
L3
N
Electrical installation – IEC 65
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