What is the difference between “compartmented switchgear and controlgear", "metalclad switchgear and controlgear" and "cubicle switchgear and control gear"?

To summarize:
-Compartmented switchgear and control gear:
Metal-enclosed switchgear and control gear assemblies with an external metal enclosure intended to be earthed and complete except for external connections.
e.g. SM6 switch cubicle.
-Metal clad switchgear and control gear:
Metal-enclosed switchgear and control gear in which components are arranged in separate compartments with metal partitions intended to be earthed.
e.g. MCset.
-Cubicle switchgear and control gear:
Metal-enclosed switchgear and control gear, other than metal clad and compartment switchgear and control gear.
e.g. SM6 circuit breaker cubicle.

Released for:Schneider Electric India