Codeology 3 Lesson 4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | 1. Branch-circuit OCPDs 2.Application limited OCPDs
3.Supplementary OCPDs, suitable for specific branch-circuit applications, under limited conditions
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| A qualifying term indicating that no delay is purposely introduced in the tripping action of the circuit breaker. | show 🗑
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| A qualifying term indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range. | show 🗑
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| A qualifying term indicating that the circuit breaker does not have any adjustment to alter the value of current at which it will trip or the time required for its operation. | show 🗑
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| show | inverse Time
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| show | Setting
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| show | Nonautomatic OCPDs
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| show | 489
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| show | 1066
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| show | 489
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| show | 489
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| show | 1077
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| Low-voltage power circuit breakers are the most rugged, highest priced, and largest size circuit breakers and are used in larger ampacity circuits in main switchgear and unit substations. | show 🗑
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| Test The operating mechanism, including the handle, opens or closes the circuit breaker contacts. | show 🗑
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| Test The characteristic of the operating mechanism in using the handle to open or close a circuit breaker is referred to as quick-make, quick-break as to prevent the breaker from being able to be “teased” from OFF-to-ON or ON-to-OFF | show 🗑
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| show | d. both a. and b.
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| Part of the process of a circuit breaker interrupting an overcurrent is that the trip unit senses the overcurrent, and releases or unlatches the contacts. This then permits the movable ? to start to travel or part from the stationary contact. | show 🗑
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| show | d. any of the above
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| show | d. all of the above
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| show | Time current
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| show | increased
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| The long-time pick-up (LTPU) and long-time delay (LTD) determine the overload protection characteristics of an adjustable electronic circuit breaker. The typical adjustment range for the LTPU is from ? times the circuit-breaker ampere rating. a. 0.25 | show 🗑
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| Current-limiting circuit breakers can be ? a. inherently current-limiting in their design b. internally fused c. both a. and b. d. neither a. nor b. | show 🗑
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| How can it be determined if a circuit breaker is current-limiting? a. All 200 A or less circuit breakers are current-limiting b. It will be marked “Current-Limiting” c. It will have an interrupting rating greater than 10kA d. None of the above | show 🗑
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| show | Molded Case Circuit Breakers (MCCBs)
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| A circuit breaker with a special “straight” rating of 277/480 volts may be used on a corner-grounded delta system. | show 🗑
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| Interrupting ratings on AC rated circuit breakers are used for ? . Select one: a. AC systems only b. DC systems only c. both AC and DC systems d. none of the above | show 🗑
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| show | True
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| show | c. From 42 kA to 200 kA
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| show | True
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| Supplementary overcurrent protection is used for luminaires, appliances, and other equipment and can be used as a substitute where branch-circuit overcurrent devices are required. | show 🗑
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| show | b. Low-voltage power circuit breakers Correct
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| Which is/are sources of circuit breaker maintenance information? I. Circuit breaker manufacturers’ manuals II. NETA Maintenance Testing Specification for Electrical for Electrical Power distribution Equipment and Systems. III. NFPA 70B Recommended Pr | show 🗑
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| Quite often, a circuit breaker will be marked with multiple voltage ratings and the corresponding interrupting ratings for each voltage rating, such as 600-volt 14 kA interrupting rating, 480-volt 22 kA, and 240-volt 42 kA. | show 🗑
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| NFPA 70E 225.3 Circuit Breaker Testing states that “Circuit breakers that interrupt faults approaching their ratings shall be inspected and tested in accordance with the manufacturer’s instructions.” | show 🗑
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| show | e. all of the above
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| show 🗑
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