Kiểm tra & Khắc phục sự cốCâu 500 / 521
For routine voltage checks at 120 V cord-and-plug receptacle outlets on a branch circuit, what CAT rating is generally the minimum appropriate category?
a.CAT II
b.CAT 0
c.No rating required
d.CAT IV only
Giải thích
Receptacle-level, cord-and-plug load measurements correspond to CAT II. CAT III/IV are for distribution panels, feeders, and service equipment; using a higher-rated meter is fine, but CAT II is the minimum appropriate for the outlet. 'CAT 0' (b) is not a standard category and a rating is always required for live work.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Testing a suspected conductor with an ohmmeter, you read 'OL' (over-limit / infinite). What does this indicate about the conductor?
- In a properly bonded system, what is the primary purpose of the equipment grounding conductor during a line-to-enclosure (ground) fault?
- Before touching conductors you believe are de-energized, what is the safest way to verify your voltage tester is trustworthy?
- You want to measure current with a DMM's internal ammeter function. Which practice is essential to avoid a dangerous fault?
- A conductor with 0.2 ohms of resistance carries 15 A. How much power is dissipated as heat in that conductor?
- A homeowner reports a 'weird' outlet. Which instrument most quickly indicates common miswires (open ground, open neutral, reversed polarity) at a 120 V receptacle?
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