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  1. paul2gh

    What is fail-safe design of switchgear control and relaying

    Gentlemen, What is the practice of fail-safe design of switchgear control and relaying? To be fail-safe, shall all dry-contacts be normally closed for interlock and intertripping? Shall all CBs be tripped when control power fails? Is there any documentation regarding fail-safe? Thanks, Paul2gh
  2. paul2gh

    Circuit Breaker Raing and Motor FLA

    Rbulsara,Thanks for your prompt reply. Because of the inrush of Motor starting current( 6 x FLA), do I need to use a larger CB to protect a motor? For example, if the motor's FLA is 630A, can I use a CB rated at 630A to protect it? Paul2gh
  3. paul2gh

    Circuit Breaker Raing and Motor FLA

    Hi everyone, We are asked to use circuit breaker to protect a 6kV motor, not a fuse. So how to decide the rating of Circuit breaker? I use 1.2 x full load current of motor as a minimum to choose CB rating for LV system. For MV sytem like 6kV, what is the criteria? Paul2gh
  4. paul2gh

    Cable size of Notification Appliance Circuit on fire alarm system

    Hi everybody, I plan to choose cable for speakers on NAC circuit. The length is 300m. Speakers are tapped at 1W rating. At most 12 speaker are connected on one NAC circuit. Please advise how to decide the size? If the cables are placed in rigid metal conduits, can we install them along with...

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