AS NZS IEC 60947.5.8:2015 pdf download.Low-voltage switchgear and controlgear Part 5.8: Control circuit devices and switching elements——Three-position enabling switches.
3 Classification
3.1 Contact elements Subclause 3.1 of IEC 60947-5-1 applies.
3.2 Three-position enabling switch Three-position enabling switches may be classified according to the contact element and the nature of the actuating system, e.g. three-position enabling switches, form B.
4 Characteristics
4.1 Summary of characteristics Subclause 4.1 of IEC 60947-5-1 applies.
4.1.1 Operation of a control switch Subclause 4.1.1 of IEC 60947-5-1 applies.
4.1.1.1 Normal conditions of use Subclause 4.1.1.1 of IEC 60947-5-1 applies.
4.1.1.2 Abnormal conditions of use Subclause 4.1.1.2 of IEC 60947-5-1 applies.
4.2 Type of three-position enabling switch
4.2.1 Examples of devices incorporating three-position enabling switches
— push-button enabling devices;
— grip actuated enabling devices;
— foot actuated enabling devices; etc.
4.2.2 Number of poles The number of poles shall be stated by the manufacturer.
4.2.3 Kind of current Alternating current or direct current.
4.3 Rated and limiting values for switching elements Subclause 4.3 of IEC 60947-5-1 applies.
4.4 Utilization categories for switching elements Subclause 4.4 of IEC 60947-5-1 applies.
4.5 Vacant
4.6 Vacant
4.7 Vacant
4.8 Vacant
4.9 Switching overvoltages Subclause 4.9 of IEC 60947-1 applies.
4.10 Electrically separated contact elements Subclause 4.10 of IEC 60947-5-1 applies.
5 Product information
5.1 Nature of information The following information shall be given by the manufacturer: ldentification
a) The manufacturer’s name or trade mark.
b) A type designation or serial number that makes it possible to get the relevant information concerning the switching element (or the entire control switch) from the manufacturer.
c)“IEC 60947-5-8”if the manufacturer claims compliance with this standard.
d) Three-position enabling switches shall be indelibly and legibly marked by the symbol:
NOTE If it is not possible to affix the marking to the switch due to size constraints, then the symbol may be put in the instructions for installation, operation and maintenance.Basic rated values and utilization
e) Actuating forces and operational stroke.
f) Rated operational voltages (see 4.3.1.1 of IEC 60947-5-1).
g) Utilization category and rated operational currents at the rated operational voltages of the switching element.
h) Rated insulation voltage (see 4.3.1.2 of IEC 60947-5-1).
i) Rated impulse withstand voltage Uimp in accordance with 4.3.1.3 of IEC 60947-1.
a) j) IP code (see 5.1 and Annex C of IEC 60947-1).
k) Pollution degree (see 6.1.3.2 of IEC 60947-5-1).
I) Type and maximum ratings of short-circuit protective device (see 8.3.4.3 of IEC 60947-5-1).
m) Conditional short-circuit current if less than 1 000 A.
n) Indication of contact elements of same polarity.
o) Mechanical and/or electrical durability.
5.2 Marking
5.2.1 General
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.
5.2.2 Terminal identification and marking Subclause 7.1.7.4 of lEO 60947-1 applies.
5.2.3 Functional markings
To avoid confusion with emergency stop devices, the actuator of an enabling switch shall not be coloured RED (see also IEC 60204-1).
5.3 Instructions for installation, operation and maintenance Subclause 5.3 of IEC 60947-1 applies.
5.4 Additional information Subclause 5.4 of IEC 60947-5-1 applies.
6 Normal service, mounting and transport conditions Clause 6 of lEO 60947-1 applies with the following additions.
6.1.3.2 Pollution degree 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.
6.3 Mounting Means shall be provided to allow the three-position enabling switch to be securely installed in its intended mounting position.
7 Constructional and performance requirements
7.1 Constructional requirements
Subclause 7.1 of lEO 60947-1 applies except for 7.1.1, 7.1.2, 7.1.6, 7.1.8 and 7.1.12, and with the following additions.
7.1.1 Materials
Subclause 7.1.1 of IEC 60947-5-1 applies.
7.1.2 Current-carrying parts and their connections Subclause 7.1.2 of IEC 60947-5-1 applies.
7.1.3 Clearances and creepage distances Subclause 7.1.3 of IEC 60947-5-1 applies.
7.1.4.3 Actuating force (or moment)
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.AS NZS IEC 60947.5.8 pdf download.