Metallic-clad and metallic-enclosed switchgear are two prevalent types of switchgear utilized in electrical power systems. While they share certain similarities, there are also significant distinctions between them. In this technical blog, we will explore the fundamental differences between metallic-clad switchgear and metallic-enclosed switchgear LV Electrical Switchgear

Metal-clad Switchgear IEEE C37.20.2

Metal-clad switchgear is a category of switchgear that is engineered to provide a high degree of protection to electrical power systems. This type of switchgear is typically utilized in medium voltage applications, generally ranging between 2.4 kV and 38 kV. Metallic-clad switchgear comprises separate compartments for the busbars, circuit breakers, and major components, each of which is enclosed within its own steel housing. The enclosures are interconnected via busbars, which may also be housed in their own steel enclosures.

The primary features of metallic-clad switchgear are as follows:

Each compartment is fully enclosed in a steel casing, which offers protection against accidental contact with live elements.

The circuit breaker is typically located in its own compartment, distanced from the busbars.

IEEE C37.20.1

Metal-enclosed switchgear is a form of switchgear designed to provide a high level of safety to electrical power systems. This type of switchgear is generally used in low-voltage applications, typically at or above 1 kV. Metallic-enclosed switchgear consists of a single steel enclosure that contains all components of the switchgear, including circuit breakers, busbars, and other important elements.

The principal features of metallic-enclosed switchgear are as follows:

All components of the switchgear are housed within a single metallic enclosure.

The circuit breaker is generally located in the same compartment as the busbars.

There are no separate compartments for the busbars or specific components.

Differences between Metal-Clad and Metal-Enclosed Switchgear

The main differences between metallic-clad switchgear and metallic-enclosed switchgear are as follows:

Enclosure Configuration: Metallic-clad switchgear features separate enclosures for each component, whereas metallic-enclosed switchgear utilizes a single enclosure for all components.

Voltage Rating: Metallic-clad switchgear is commonly used in medium-voltage applications, while metallic-enclosed switchgear is typically employed in low-voltage applications.

Compartmentalization: Metallic-clad switchgear is organized into compartments to separate the circuit breaker from the busbars and additional components, while metallic-enclosed switchgear has all components within the same compartment.

Accessibility: Metallic-enclosed switchgear offers easy access to all components, whereas metallic-clad switchgear may require more effort to access each element.

Space Requirements: Metallic-clad switchgear demands additional space due to the separate compartments, while metallic-enclosed switchgear requires considerably less space.
In conclusion, metal-clad switchgear and metal-enclosed switchgear are two prevalent types of switchgear utilized in electrical power systems. While they share certain similarities, they also possess distinct differences regarding their enclosure configuration, voltage rating, compartmentalization, accessibility, and spatial requirements. Understanding the variations between these two types of switchgear can assist engineers in selecting the appropriate option for their specific applications.