Switchgear assemblies service conditions

Design parameters and service conditions for a switchgear assembly 13/342... 

Below we discuss briefly the constructional requirements and general manufacturing practices for cubicle-type switchgear and controlgear assemblies, and the electrical and the mechanical design considerations to comply with the above design parameters and service conditions. 

Circuits are controlled by switchgear which is assembled so that the circuit may be operated safely under normal conditions, isolated automatically under fault conditions, or isolated manually for safe maintenance. These requirements are met by good workmanship carried out by competent persons and the installation of approved British Standard materials such as switches, isolators, fuses or circuit breakers. (lEE Regulation 131.1.1). The equipment belonging to the supply authority is sealed to prevent unauthorized entry, because if connection were made to the supply before the meter, the energy used by the consumer would not be recorded on the meter. Figure 6.6 shows the connections and equipment at a domestic service position. 

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