Installation Instructions

Chapter 1 - Safety
Grounding and Ground Fault Protection
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Siemens Industry, Inc.
Smart Infrastructure
Siemens BT300 HVAC Drive
Installation Instructions
DPD01148
2019-05-29
or
• Provision of an additional terminal for a second protective grounding
conductor of the same cross-sectional area as the original protective
grounding conductor.
Table 3: Protective Grounding Conductor Cross-Section.
Cross-sectional area of phase conductors ( S )
AWG (mm
2
)
Minimum cross-sectional area of the
corresponding protective grounding conductor
AWG (mm
2
)
S ≤ 6 (16)
6 (16) < S ≤ 35 (2)
35 (2) < S
S
6 (16)
S /2 (14)
The values in this table are only valid if the protective grounding conductor is made of the same metal
as the phase conductors. If this is not the case, the cross-sectional area of the protective grounding
conductor must be determined in a manner which produces a conductance equivalent to that which
results from the application of this table.
The cross-sectional area of every protective grounding conductor which does not
form a part of the supply cable or cable enclosure shall, in any case, not be less
than:
• 14 AWG (2.5 mm
2
) if mechanical protection is provided, or
• 12 AWG (4 mm
2
) if mechanical protection is not provided.
• For cord-connected equipment, provisions shall be made so that the protective
grounding conductor in the cord shall, in the case of failure of the strain-relief
mechanism, be the last conductor to be interrupted.
However, always follow the local regulations for the minimum size of the
protective grounding conductor.
NOTICE
Do not perform voltage withstand tests on any part of the BT300 Drive.
A procedure is in place, according to which the tests must be performed. Ignoring
this procedure may result in product damage.
NOTE:
Due to the high capacitive currents present in the drive, fault current protective
switches may not function properly.