46 Electrical installation: AC input, motor and brake
When using unearthed/ungrounded distribution systems, an isolation transformer
with an earthed/grounded secondary is recommended. This provides three-phase AC
power that is symmetrical with respect to earth/ground and can prevent equipment
damage.
Protection class
User protection has been achieved using Protective Class I (EN 61800-5-1), which
requires an earth connection to the unit whenever hazardous voltages are applied.
The equipment provides protection against electric shock by:
• Means of connection of protective earth to accessible live conductive parts.
• Basic insulation.
Earth leakage
Maximum earth leakage from the MicroFlex e150 is 3.4 mA per phase (230 V, 50 Hz
supply). This value does not include the earth leakage from the AC power filter, which
could be much larger (see EMC filters on page 166). If the MicroFlex e150 and filter
are mounted in an enclosure, it is recommended the enclosure is earthed using a
10 mm
2
conductor.
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