It is usually located at the backside of the breaker compartment, which is also compartmentalized by solid barriers from the breaker compartment. It houses the main busbar system, which is connected to the fixed upper isolating contacts of the main switchgear apparatus through. With regard to the positioning of the equipment, it has been decided to locate the main circuit breaker in one column, and the three outgoing feeders in another one. Figure 1: Busbar Standard The IEC 61439 standard applies to busbar assemblies that will be installed in electrical applications with a. In low-voltage power distribution, the cabinet is never just a cabinet, and the busbar is never just a strip of copper. Behind every reliable low voltage switchgear lineup is a design balance that is harder than it first appears: current must flow safely, heat must be controlled, internal space. ear for its global and local customers. This together with the global ser vice and support network established in over 30 manufac-turing locations world wide ensures that the c m is a low voltage switchgear assembly. Its design is ver ied in accordance with IEC 61439-1/-2. It also depends on material choice, joint quality. The following are the key factors that determine the suitability and performance of a bus bar system in a switchboard: 1. Current Carrying Capacity The bus bar must be sized to carry the continuous full-load current without exceeding permissible temperature rise limits.
