125 V DC SWITCHBOARD Sample Clauses

125 V DC SWITCHBOARD. The 125 V DC switchboard shall be a multi-unit type comprising circuit breakers and motor starters as necessary. The switchboard as a whole shall comply with IEC 60439 and shall be capable of sustaining without damage the electrical and mechanical stresses imposed by fault conditions. The switchboard shall be equipped with one set of positive and negative main busbars. The busbars are to be of either aluminium or tinned copper conductor, rigidly supported and fully insulated throughout their lengths. The busbars are to be fully rated throughout. Circuit breakers are to comply with IEC 60947. All circuit breakers shall be identical in arrangement and those of the same current rating shall be interchangeable. All circuit breakers shall be two pole type. Closing mechanisms shall be of the trip free type with closing and tripping coils suitable for 125 V DC operation. Each battery circuit breaker shall have an overcurrent trip device of suitable rating to ensure satisfactory discrimination with the largest outgoing circuit breaker connected to the load busbar. DC motor starters shall comply with IEC 60947 and shall incorporate a multi-step starting resistance. Contactors shall comply with IEC 60947. The DC contactors and their associated apparatus shall be capable of normal operation with the supply voltage between -20% and +12%. The closing and tripping coils shall be wired in series with contactor auxiliary switches arranged so that the supply to these coils is automatically cut off on completion of a successful operation. Each motor starter unit shall have protective equipment of the thermal overcurrent type. Each motor starter, switchfuse or other district circuit shall form an individual compartment in which the main and control circuit cables are terminated. Access to these terminations shall be arranged so that it is independent of access to any other circuit compartment.
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Related to 125 V DC SWITCHBOARD

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