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An output isolation monitor interrupter (IMI).
If the isolation level is compromised, charging is halted or prevented from starting and the output de-
energized. The isolation monitor operates continuously during charging to ensure the output is always
galvanically isolated. UL 2231-1 requires that an isolation monitor interrupter (IMI) is provided in the
product and evaluated during operation as part of certification testing.
Although RCD/GFCI use is required in mode 1,2,3 AC charger installations, neither UL nor IEC mandate an
RCD for a permanently installed mode 4 isolated output DC charger.
RCD Settings
For Standalone Express 280 installations where the use of an RCD (RCCB or RCBO) cannot be avoided, use
the following settings to minimize nuisance trips:
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Type: A, F or B (type B and F preferred)
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Trip threshold: 500 mA
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Trip delay: 150 ms
If an RCD must be employed for a Paired installation, contact ChargePoint.
Grounding Requirements
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The station must be connected to a grounded, metal, permanent wiring system. A suitably sized
grounding conductor must be run with circuit conductors and connected to an equipment-
grounding terminal.
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Ensure a grounding conductor that complies with local codes is properly grounded to earth at the
service equipment or, when supplied by a separate system, at the supply transformer.
20
Grounding Requirements
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