Metal Clad Switchgear?

	IEC60298 (1990-12)	IEC62271-200 (2003-11)
1. Construction types	3 classifications are defined.	No definition.
	a) Metal-clad switchgear and controlgear
	b) Compartmented switchgear and controlgear
	c) Cubicle switchgear and controlgear
2. Partition types	No definition.	2 types are defined.
		a) PM: Metallic partitions and/or shutters, intended to be earthed, between opened accesible compartments and live parts of the main circuit.
		b) PI: One or more non-metallic partitions or shutters between opened accessible compartments and live parts of the main circuit.
3. Loss of service community category (LSC)	No definition.
		a) LSC1: Other functional units or some of them shall be disconnected.
		b) LSC2A: Other functional units can be energized.
		c) LSC2B: Other functional units and all cable compartments can be energized.
4. IP grade of enclosure	No definition.	IP2X is required.

 

* LV는 IEC 60439-1에 따라 form construction 구분

 

 

Metal-Clad Switchgear Definition

 

Metal-Clad Switchgear is an assembly of units characterized by the following features:

 

The main interrupting device is removable and arranged with a mechanism for moving it physically between connected and disconnected positions.  It is equipped with self-aligning and self-coupling primary and secondary disconnecting devices.

 

The interrupting devices, buses, voltage transformers, and control power transformers, are completely enclosed by grounded metal barriers, which have no intentional openings between compartments.  A metal barrier in front of the interrupting device ensures that when, in the connecting position, no live parts are exposed by the opening of an enclosure door.

 

All live parts are enclosed within grounded metal compartments.

 

Automatic grounded metal shutters cover primary circuit elements when the removable element is in the disconnected, test, or removed position.

 

Primary bus conductors and connections are covered with track-resistant insulating material throughout.

 

Mechanical interlocks are provided to maintain a proper and safe operating sequence and to ensure matching ampacities between circuit breaker and cell.

 

Grounded metal barriers isolate and ground instruments, meters, relays, secondary control devices, and their wiring from all primary circuit elements.  If a short circuit or fault occurs, all damage is contained within the metal-clad enclosure.

 

 

Applicable Industry Standards

 

ANSI American National Standards Standard Institute

C37.010 Application Guide for AC High Voltage Circuit Breakers Rated on A Symmetrical Current Basis

C37.100 Definitions for Power Switchgear

C37.04 Rating Structure for AC High Voltage Circuit Breakers

C37.06 Preferred ratings for AC High Voltage

C37.07 Factors for reclosing service

C37.09 Test procedure for AC High Voltage Circuit Breaker

C37.11 Power Circuit Breaker Control

C37.20.2 Metal-Clad and Station-Cubicle Switchgear

1 C37.21 Application Guide for Metal-Enclosed Switchgear

1 C37.55 Conformance Testing of Metal-Clad Switchgear

C37.24 Guide for evaluating the effect of solar radiation

 

NEMA National Electrical Manufacturers Association

 

SG-4 Power Circuit Breakers

SG-5 Power Switchgear Assemblies

 

Comparison Between ANSI and IEC_MetalCladSwitcgear by tsixt1327