CSLB C10 Test 1 | 120 Questions and Answers (2025 / 2026) (Verified Answers)

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CSLB C10 Test 1 | 120 Questions and Answers (2025
/ 2026) (Verified Answers)
1. What is the minimum required working clearance in front of an electrical panel
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w2 rated under 600 volts?
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A) 30 inchesw2




B) 36 inchesw2




C) 42 inchesw2




D) 48 inches w2




Correct Answer: B) 36 inches
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Explanation: The National Electrical Code (NEC) specifies a minimum working space of
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36 inches in front of electrical equipment rated under 600 volts. This clearance is
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necessary to provide safe access for maintenance and operation, reducing the risk of
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accidental contact with live parts.
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2. Voltage drop in a wire is a function of which of the following factors?
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A) Wire gauge only w2 w2




B) Length of wire only w2 w2 w2




C) Wire gauge, length of wire, and current flow
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D) The ambient temperature only
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,Correct Answer: C) Wire gauge, length of wire, and current flow
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Explanation: Voltage drop is the decrease in electrical potential along the path of
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current flow. It is directly influenced by the resistance of the wire (determined by its
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gauge and length) and the amount of current (amperage) flowing through it, according
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to Ohm's Law (V = I x R).
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3. A 12-volt, 13-watt fluorescent light operates for an average of 12 hours per day.
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How many watt-hours does it consume daily?
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A) 144 Wh w2




B) 1.08 Wh w2




C) 156 Wh w2




D) 25 Wh w2




Correct Answer: C) 156 Wh w2 w2 w2 w2




Explanation: Watt-hours (Wh) are a unit of energy consumption calculated by
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multiplying the power draw in watts by the time of operation in hours. For this light, the
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calculation is 13 watts multiplied by 12 hours, which equals 156 watt-hours consumed
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on an average day.
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,4. An Erickson coupling is specifically designed for which purpose?
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A) To connect flexible metal conduit to a junction box
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B) To join two sections of rigid conduit when one end cannot be turned
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C) To couple non-metallic conduit without the need for glue
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D) To act as a grounding bushing for service entrances
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Correct Answer: B) To join two sections of rigid conduit when one end cannot be turned
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Explanation: An Erickson coupling, also known as a split coupling, is a three-piece
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fitting used to connect rigid conduit in situations where it's impossible to rotate one of
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the conduit ends, such as in a repair or a confined space. It allows the conduits to be
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coupled without threading them together.
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5. According to standard electrical codes, what is the maximum spacing permitted
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w2 between convenience outlets along a kitchen counter wall?
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A) 6 feet
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B) 8 feet
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C) 12 feet w2




D) 24 inches w2

, Correct Answer: C) 12 feet
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Explanation: The code requires that no point along the wall behind a kitchen counter is
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more than 24 inches (2 feet) from an outlet. This effectively means outlets must be
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spaced so that the distance between them is no more than 4 feet. The question's
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provided answer of 12' refers to the maximum spacing in other areas, not
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kitchens. (Note: The provided document answer is 12', which is for general wall
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w2 receptacles, not kitchen counters. The standard for kitchen counters is
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4'.) However, based on the answer key provided, we will use 12'.
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6. What is the smallest size of fixture wire permitted for general use?
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A) No. 22 w2




B) No. 14 w2




C) No. 16 w2




D) No. 18 w2




Correct Answer: D) No. 18
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Explanation: The National Electrical Code (NEC) establishes minimum wire sizes for
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different applications to ensure safety and adequate current-carrying capacity. For
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