LSC stands for: Loss of Service Continuity category
The IEC 62271-200 proposes user-oriented definitions and classifications intended to describe how a given switchgear can be accessed, and what will be the consequences on the installation.#
When the accessibility of the various compartments are known, then the consequences of opening a compartment on the operation of the installation can be assessed; it is the idea of Loss of Service Continuity which leads to the LSC classification proposed by the IEC: “category defining the possibility to keep other high-voltage compartments and/or functional units energised when opening a accessible high-voltage compartment”.
Several categories are defined, according to “the extent to which the switchgear and controlgear are intended to remain operational in case access to a high-voltage compartment is provided”:
For a more complete description please download the Medium Voltage technical guide.
The IEC 62271-200 proposes user-oriented definitions and classifications intended to describe how a given switchgear can be accessed, and what will be the consequences on the installation.#
When the accessibility of the various compartments are known, then the consequences of opening a compartment on the operation of the installation can be assessed; it is the idea of Loss of Service Continuity which leads to the LSC classification proposed by the IEC: “category defining the possibility to keep other high-voltage compartments and/or functional units energised when opening a accessible high-voltage compartment”.
Several categories are defined, according to “the extent to which the switchgear and controlgear are intended to remain operational in case access to a high-voltage compartment is provided”:
- LSC1: If any other functional unit than the one under intervention has to be switched off, then service is partial only:
- LSC2 If at least one set of busbars can remain live, and all other functional units can stay in service, then service is optimal:
- LSC2A or LSC2B: If within a single functional unit, other(s) compartment(s) than the connection compartment is accessible, then suffix A or B can be used with classification LSC2 to distinguish whether the cables shall be dead or not when accessing this other compartment.
For a more complete description please download the Medium Voltage technical guide.
Released for:Schneider Electric UK
