Grounding And Ground Fault Protection - Siemens BT300 Installation Instructions Manual

Chapter 1 - Safety

Grounding and Ground Fault Protection

10 | 82
Siemens Industry, Inc.
Building Technologies
NOTICE
The drives are suitable for use on a circuit capable of delivering not more than
100,000 rms symmetrical amperes, 600V maximum.
Grounding and Ground Fault Protection
WARNING
The Siemens BT300 Drive must always be grounded with a grounding conductor
connected to the grounded terminal marked with .
Le variateur Siemens BT300 doit toujours être mis à la terre avec un conducteur de
protection connecté à la borne de mise à la terre marquée .
The touch current of the BT300 Drive exceeds 3.5 mA AC. According to EN 61800-5-1,
a fixed connection and one or more of the following conditions for the associated
protective circuit must be met:
● The protective grounding conductor must have a cross-sectional area of at least 8
AWG (10 mm ) Cu or 6 AWG (16 mm
2
or
● An automatic disconnection of the supply in case of discontinuity of the protective
grounding conductor. See
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 (
AWG (mm
S
≤ 6 (16)
6 (16) < S ≤ 35 (2)
S
35 (2) <
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 ) if mechanical protection is provided, or
2
● 12 AWG (4 mm ) if mechanical protection is not provided.
2
● 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.
Siemens BT300 HVAC Drive Installation
Instructions
) Al.
2
Chapter 4 Power Cabling
S
) Minimum cross-sectional area of the corresponding
)
2
.
protective grounding conductor
AWG (mm )
2
S
6 (16)
S
/2 (14)
DPD01148
2016-06-28