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Komise : IEC/SC 121B (Low-voltage switchgear and controlgear assemblies)
K připomínkám do: 30.04.2019
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This part of IEC 61439 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies.

NOTE Throughout this document, the term assembly (see 3.1.1) is used for a low-voltage switchgear and controlgear assembly.

This document cannot be used alone to specify an assembly or used for the purpose of determining conformity. Assemblies comply with the relevant part of the IEC 61439 series, Part 2 onwards. For assemblies not covered by Part 3 onward, Part 2 applies.

This standard applies to low-voltage switchgear and controlgear assemblies only when required by the relevant assembly standard as follows:

Assemblies for which the rated voltage does not exceed 1 000 V in the case of AC or
1 500 V in the case of DC;

Assemblies designed for a nominal frequency of the incoming supply or supplies not exceeding 1 000 Hz;

< > intended for indoor and outdoor applications;

stationary or movable assemblies with or without an enclosure;

Assemblies intended for use in connection with the generation, transmission, distribution and conversion of electric energy, and for the control of electrical energy consuming equipment.

This document does not apply to individual devices and self-contained components such as motor starters, fuse switches, power electronic converter systems and equipment (PECS), switch mode power supplies (SMPS), uninterruptable power supplies (UPS), basic drive modules (BDM), complete drive modules (CDM), adjustable speed power drives systems (PDS), and other electronic equipment which comply with their relevant product standards. This document describes the integration of devices and self-contained components into an assembly or into an empty enclosure forming an assembly.

For some applications, such as electrical equipment of machines or those involving, for example, explosive atmospheres, functional safety, there may be a need to comply with the requirements of other standards or legislation in addition to those specified in the IEC 61439 series.

Komise : IEC/SC 121A (Low-voltage switchgear and controlgear)
K připomínkám do: 30.04.2019
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This part of IEC 60947 series specifies requirements for three-position enabling switches.

These switches are used as components of enabling devices to provide signals that,

when activated, allow machine operation to be initiated by a separate start control, and

when de-activated,

initiate a stop function, and

prevent initiation of machine operation.

NOTE 1 The enabling control function is described in of IEC 60204-1:2016 but the application of three-position enabling switches is not limited to a component of the enabling device described in IEC  60204-1.

NOTE 2 This document does not deal with enabling devices.

These switches are intended to be connected to circuits which rated voltage does not exceed 250 V AC 50 Hz/60 Hz or 300 V DC.

EXAMPLE Devices incorporating three-position enabling switches are:

- push-button enabling devices;

- grip actuated enabling devices;

- foot actuated enabling devices.

See Annex A for more typical examples.

This document does not apply to:

-  three-position enabling switches for non-electrical control circuits, for example hydraulic, pneumatic;

-   enabling switches without three-position mechanism;

-   emergency stop devices (see IEC 60947-5-5).