Codeology Lesson 3 Overcurrent Device Ratings
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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| If a conductor’s ampacity does not correspond to a standard circuit breaker or fuse ampere rating found in _1_, __2__ permits selecting the next standard ampere rating if specific conditions in __3___ are met. | show 🗑
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| show | a. Ampere rating Incorrect
b. FRAME SIZE
c. Interrupting rating Incorrect
d. Voltage rating Incorrect
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| show | False
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| Ampere rating, voltage rating, interrupting rating where other than 10,000 amperes, current limiting where applicable, and the name or trademark of the manufacturer are all items which must be plainly marked on the barrel of a fuse. | show 🗑
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| A fuse or circuit breaker with a 600-volt AC rating is permitted to be used on 300-volt DC application by the half voltage rule in NEC Article 240. | show 🗑
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| show | False
Note: By their design, fuses are full voltage rated devices. Slash voltage ratings are not an issue. For example, Class J fuses are rated at 600 V AC and are utilized on systems rated 600 V AC on any distribution system.
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| All circuit breaker are required to have their ampere ratings marked on the circuit breaker handle or escutcheon | show 🗑
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| show | True
The correct answer is: 110.24(A)
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| Straight voltage rated circuit breakers of the proper voltage rating (the volt rating is greater than system line-line voltage) are allowed to be used on which of the following voltage systems? | show 🗑
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| Slash voltage rated circuit breakers of the proper voltage rating are allowed to be used on which of the following voltage systems? | show 🗑
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| show | false
Review the still photos from Figure 11 and the associated videos available.
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| Generally, conductors shall be protected at their ampacities by branch-circuit overcurrent devices | show 🗑
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| show | 10 AWG Aluminum → 25 amperes, 12 AWG Aluminum → 15 amperes, 10 AWG Copper → 30 amperes, 12 AWG Copper → 20 amperes, 16 AWG Copper → 10 amperes, 18 AWG Copper → 7 amperes
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| show | b. interrupting rating
NEC Reference 100
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| show | True
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| Per the second paragraph of 110.9, devices such as motor starters and switches must have interrupting ratings at applied voltage sufficient for the available short circuit at its line terminals. | show 🗑
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| If a branch-circuit fuse is not marked with an interrupting rating, then the interrupting rating for that fuse is ? . | show 🗑
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| show | 5,000
240.83(c)
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| show | False
NEC ref: 240.60(C)
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| Typically what is the single most influencing factor on the magnitude of the available short-circuit current at the service? | show 🗑
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| New service equipment in commercial buildings must be field marked with the maximum available fault current and the date the calculations were performed. | show 🗑
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| show | True
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| A panelboard that is located downstream from a service disconnect is calculated to have 45,000 amperes of available fault current. A circuit breaker installed in this downstream panel must have an interrupting rating equal or greater than ? . | show 🗑
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| What is/are the most common interrupting ratings for current-limiting fuses? | show 🗑
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Created by:
Shawnt321