Table 2: Protective earthing conductor cross-section
Cross-sectional area of the phase conductors (S)
[mm
2
]
The minimum cross-sectional area of the protective
earthing 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 earthing conductor is made of the same
metal as the phase conductors. If this is not so, the cross-sectional area of the protective
earthing 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 earthing 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 earthing 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 earthing 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 earthing 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
www.vacon.com/downloads.
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 www.vacon.com/
downloads.
VACON · 12 SAFETY
2
TEL. +358 (0)201 2121 · FAX +358 (0)201 212 205