Confirmation method for function of on-board isolation resistance monitoring system

The function of the on-board isolation resistance monitoring system shall be confirmed by the following method:

Insert a resistor that does not cause the isolation resistance between the terminal being monitored and the electrical chassis to drop below the minimum required isolation resistance value. The warning shall be activated.

Appendix 3

Protection against direct contacts of parts under voltage

1. Access probes

Access probes to verify the protection of persons against access to live parts are given in Table 4-Ap3-1.

2. Test conditions

The access probe is pushed against any openings of the enclosure with the force specified in Table 4-Ap3-1. If it partly or fully penetrates, it is placed in every possible position, but in no case shall the stop face fully penetrate through the opening.

Internal barriers are considered part of the enclosure

A low-voltage supply of ≥ 40 V and ≤ 50 V in series with a suitable lamp shall be connected, if necessary, between the probe and live parts inside the barrier or enclosure.

The signal-circuit method shall also be applied to the moving live parts of high voltage equipment.

Internal moving parts may be operated or otherwise repositioned slowly, where this is possible.

3. Acceptance conditions

The access probe shall not touch live parts.

If this requirement is verified by a signal circuit between the probe and live parts, the lamp shall not light up.

In the case of the test for IPXXB, the jointed test finger may penetrate to its 80 mm length, but the stop face (diameter 50 mm x 20 mm) shall not pass through the opening. Starting from the straight position, both joints of the test finger shall be successively bent through an angle of up to 90 degree with respect to the axis of the adjoining section of the finger and shall be placed in every possible position.

In case of the tests for IPXXD, the access probe may penetrate to its full length, but the stop face shall not fully penetrate through the opening.

Table 4-Ap3-1

Access probes for the tests for protection of persons against access to hazardous parts