Table 2: Protective grounding conductor cross-section
Cross-sectional area of the phase conductors (S)
[mm
2
]
The minimum cross-sectional area of the protective
grounding conductor in question [mm
2
]
S ≤ 16 S
16 < S ≤ 35 16
35 < S S/2
The values of the table are valid only if the protective grounding conductor is made of the
same metal as the phase conductors. If this is not so, the cross-sectional area of the
protective grounding conductor must be determined in a manner that produces a
conductance equivalent to that which results from the application of this table.
The cross-sectional area of each protective grounding conductor that is not a part of the
mains cable or the cable enclosure, must be a minimum of:
•
2.5 mm
2
if there is mechanical protection, and
•
4 mm
2
if there is not mechanical protection. If you have cord-connected equipment,
make sure that the protective grounding conductor in the cord is the last conductor to be
interrupted, if the strain-relief mechanism breaks.
Obey the local regulations on the minimum size of the protective grounding conductor.
NOTE!
Because there are high capacitive currents in the AC drive, it is possible that the
fault current protective switches do not operate correctly.
CAUTION!
Do not do voltage withstand tests on the AC drive. The manufacturer has already
done the tests. Doing voltage withstand tests can cause damage to the drive.
2.5 USING AN RCD OR AN RCM DEVICE
The drive can cause a current in the protective grounding conductor. You can use a residual
current-operated protective (RCD) device, or a residual current-operated monitoring (RCM)
device to give protection against a direct or an indirect contact. Use a type B RCD or RCM
device on the mains side of the drive.
NOTE! You can download the English and French product manuals with applicable safety, warning and caution
information from
http://drives.danfoss.com/knowledge-center/technical-documentation/.
REMARQUE Vous pouvez télécharger les versions anglaise et française des manuels produit contenant l'en-
semble des informations de sécurité, avertissements et mises en garde applicables sur le site http://
drives.danfoss.com/knowledge-center/technical-documentation/.
SAFETY VACON · 13
LOCAL CONTACTS: HTTP://DRIVES.DANFOSS.COM/DANFOSS-DRIVES/LOCAL-CONTACTS/
2
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