Control Circuit Protection Supplementary Protectors vs. Miniature Circuit Breakers - PowerPoint PPT Presentation

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Control Circuit Protection Supplementary Protectors vs. Miniature Circuit Breakers

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    1. Control Circuit Protection Supplementary Protectors vs. Miniature Circuit Breakers UL 1077 vs. UL 489

    2. Workshop Name Goes Here November, 2006 What is Supplementary Protection?

    3. Workshop Name Goes Here November, 2006 What is a Final Overcurrent Device?

    4. Workshop Name Goes Here November, 2006 What is a Branch Circuit?

    5. Workshop Name Goes Here November, 2006 What is Supplementary Protection? Supplementary Overcurrent Protective Device A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires (lighting fixtures) and appliances (and other equipment or for internal circuits and components of equipment). This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device. NEC2005, NFPA 70: National Electrical Code, Article 100, Definitions (70-31) Article 240.10 [Overcurrent Protection] (70-84)Supplementary Overcurrent Protective Device A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires (lighting fixtures) and appliances (and other equipment or for internal circuits and components of equipment). This limited protection is in addition to the protection provided in the required branch circuit by the branch circuit overcurrent protective device. NEC2005, NFPA 70: National Electrical Code, Article 100, Definitions (70-31) Article 240.10 [Overcurrent Protection] (70-84)

    6. Workshop Name Goes Here November, 2006 What is Supplementary Protection? (NEC Article 240-10) Siemens 5SX/5SY/5SP Supplementary Protectors are used to provide overcurrent protection where branch protection is already provided or, not required. Supplementary Protectors are installed as a component with, or part of, a piece of electrical equipment. Supplementary Protectors protect equipment, not wiring systems. Typical equipment includes: Motor Control Circuits Control Power Transformers Relays Contactor Coils PLC I/O Points Lighting Circuits (NEC Article 240-10) Siemens 5SX/5SY/5SP Supplementary Protectors are used to provide overcurrent protection where branch protection is already provided or, not required. Supplementary Protectors are installed as a component with, or part of, a piece of electrical equipment. Supplementary Protectors protect equipment, not wiring systems. Typical equipment includes: Motor Control Circuits Control Power Transformers Relays Contactor Coils PLC I/O Points Lighting Circuits

    7. Workshop Name Goes Here November, 2006 Circuit Breaker or Supplementary Protector?

    8. Workshop Name Goes Here November, 2006 Circuit Breaker or Supplementary Protector UL 489 These requirements apply to molded case circuit breakers, These circuit breakers are specifically intended to provide service entrance, feeder and branch circuit protection in accordance with the National Electrical Code, NFPA 70. UL 1077 These requirements apply to supplementary protectors intended for use as overcurrent; or, over- or under-voltage protection within an appliance or other electrical equipment where branch circuit protection is already provided, or not required by the standard.

    9. Workshop Name Goes Here November, 2006 UL Safety Standard Differences

    10. Workshop Name Goes Here November, 2006 UL Safety Standard Differences

    11. Workshop Name Goes Here November, 2006 Supplementary Protector Check List

    12. Workshop Name Goes Here November, 2006 Supplementary Protector Check List

    13. Workshop Name Goes Here November, 2006 Advantages of Supplementary Protectors Small Installed Size Precise Component Protection protects components better than conventional circuit breakers during short circuits Resetable After A Fault (if not a fuse) Tripping Selectivity Fault Isolation only part of the circuit is affected

    14. Workshop Name Goes Here November, 2006 Typical Supplementary Protector Applications

    15. Workshop Name Goes Here November, 2006