- Particulars of system, i.e. nominal and highest voltages, frequency, number of phases and details of neutral earthing.
- Service conditions, including min and max ambient, air temperatures, altitude from sea level.
- Characteristics of a disconnector or earthing switch:
- disconnector switch model(HCB,VERTICAL,PANTOGRAPH,…)
- number of poles;
- installation: indoor or outdoor;
- rated voltage;
- rated frequency;
- rated normal current (for disconnectors only);
- rated peak and short-time withstand currents;
- rated short-circuit making current, if any (for earthing switches only).
- duration of short-circuit
- rated static and dynamic mechanical terminal loading
- how to install and height of the blade from the ground
- mechanical class(M1,M2)
- creepage distance of disconnecto rswitch insulator
- Characteristics of the operating mechanism and associated equipment, in particular:
- method of operation, (manual or motor)
- the type of available supply energy (e.g. compressed air, or electrical d.c. or a.c.) and its ratings (pressure, voltage, frequency),
- number and type of auxiliary contacts.
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