AS NZS IEC 60947.5:2015 pdf free
AS NZS IEC 60947.5:2015 pdf free.Low-voltage switchgear and controlgear
Marking of data specified in items a), b), c) and d) of 5.1 is mandatory on the nameplate of the three-position enabling switch in order to permit the complete information to be obtained from the manufacturer.
Marking shall be indelible and easily legible, and shall not be placed on screws and easily removable parts.
Whenever space permits, data under items e) to o) of 5.1 shall be included on the nameplate,or on the three-position enabling switch or otherwise in the manufacturer’s published literature.
Unless otherwise stated by the manufacturer, a three-position enabling switch is intended for installation under environmental conditions of pollution degree 3. However, other pollution degrees may apply, depending upon the micro-environment.
The force (or moment) required to operate the actuator shall be compatible with the intended application, taking into account the size of the actuator, the type of enclosure or panel, the environment of the installation and the use for which it is intended.
The three positions are designated as follows (see Figure 2):
– position 1: OFF state of the contact (actuator is not pressed);
– position 2: ON state of the contact (actuator is pressed to the normal enabling position);
– position 3: OFF state of the contact (actuator is fully depressed).
The three-position enabling switch pressed to position 2 shall return to position 1 when released. The three-position enabling switch shall change from position 2 to position 3 when pressed further. When released from position 3 to position 1, the switching element shall not close when the actuator passes through position 2.Figure 1 ilustrates the three positions and the corresponding contact states.
The operational stroke and force to actuate the three-position enabling switch from position 1 to position 2 and from position 2 to position 3 shall be stated by the manufacturer.
The inspection shall be supplemented by a dielectric test which is carried out according to 8.3.3.4 with the following amendments: the required minimum duration of voltage application is reduced to 1 s and the metal foil and external terminal connections are unnecessary.AS NZS IEC 60947.5 pdf free download.
