CALFORNIA C10 ELECTRICAL FINAL PAPER 2025/2026
QUESTIONS WITH ANSWERS RATED A+
✔✔50. Types of grounding in houses include _______. - ✔✔Equipment grounding
system
✔✔51. The _______ neutral wire carries current on a continuous basis as part of the
normal circuit. - ✔✔White
✔✔52. The primary function of the _______ wire is to normally be at rest, ready, in case
of emergency, to carry electricity to the neutral service at the service box. - ✔✔Ground
✔✔53. The largest grounding wire required in the US is _______ Gauge. - ✔✔6
✔✔54. The_______ wire can sometimes safely dissipate electricity from smaller
lightning strikes. - ✔✔Earth ground
✔✔55. A wire between two electrical boxes _______. - ✔✔Bonds
✔✔56. _______ Is the result of electrical potential building up in an ungrounded
conductor and jumping to another conductor brought close to it. - ✔✔Arcing
✔✔57. A _______ Bonds the cabinet to the system neutral terminal. - ✔✔Bonding
screw
✔✔58. Ground wire should never be attached to _______ pipe. - ✔✔Plastic
✔✔59. The only place the house neutral should be bonded to the ground is at the
_______. - ✔✔Service box
✔✔60. Load-center power distribution systems _______. - ✔✔Enable the use of
combined power and light systems
✔✔61. The load in a sign branch circuit must not exceed _______ amperes. - ✔✔20
✔✔62. For a single-family house that has an initial computer load of 10kw or more, the
minimum ampacity allowed by code is a _______-amp 130/240-volt, 3 wire service
supplied by three wires. - ✔✔100
✔✔63. For fused service equipment larger than the minimum required by code,
_______ with a smaller ampacity rating and the ampere rating of the switch may be
used, providing the switch used does not have a higher ampere rating than the
ampacity of the wires. - ✔✔Service wires
, ✔✔64. If the ampacity of a no. 10 wire is 30 amp, the minimum size wire for a 30-amp
service is _______. - ✔✔No. 8
✔✔65. The demand factor applied to that portion of an unbalanced neutral feeder load
in excess of 200 amps is _______%. - ✔✔70
✔✔66. The code required for lighting load for a school is _______ watts per sq. ft. -
✔✔3
✔✔67. _______ as applied to motor-compressors, is defined as the current resulting
when a motor-compressor is operated at rated load, rated voltage and rated frequency
of the equipment it serves. - ✔✔Rated load current
✔✔68. Frequent _______ may occur if a house served by a 120/240-volt service has
the hot wires of the branch circuits unevenly divided. - ✔✔Tripping of breakers
✔✔69. The minimum number of conductors required for combined power and lighting in
a star of wye 3-phase system is _______. - ✔✔4
✔✔70. _______ has turns common to both the primary and secondary. - ✔✔An
autotransformer
✔✔71. A combined light and power wiring system _______. - ✔✔Simplifies a large
wiring job
✔✔72. Direct-current iron-core transformers are not used in combination light and
power systems because they _______. - ✔✔Don't exist
✔✔73. The resistance for aluminum wire has a _______ higher factor than the same
size copper wire. - ✔✔1.6
✔✔74. In a 3-phase, 4-wire delta system , the neutral conductor _______. - ✔✔Must be
smaller than the phase conductors
✔✔75. Lighting conductors must be kept _______ ft. From communication conductors
on the same building. - ✔✔6
✔✔76. In residential wiring, 3-phase 4 wire systems are used for _______. - ✔✔Water
heaters and lighting, 240Y/120 volts and lighting and large appliances
✔✔77. A _______ test ensures the equipment grounding conductor is electrically
continuous. - ✔✔Continuity
QUESTIONS WITH ANSWERS RATED A+
✔✔50. Types of grounding in houses include _______. - ✔✔Equipment grounding
system
✔✔51. The _______ neutral wire carries current on a continuous basis as part of the
normal circuit. - ✔✔White
✔✔52. The primary function of the _______ wire is to normally be at rest, ready, in case
of emergency, to carry electricity to the neutral service at the service box. - ✔✔Ground
✔✔53. The largest grounding wire required in the US is _______ Gauge. - ✔✔6
✔✔54. The_______ wire can sometimes safely dissipate electricity from smaller
lightning strikes. - ✔✔Earth ground
✔✔55. A wire between two electrical boxes _______. - ✔✔Bonds
✔✔56. _______ Is the result of electrical potential building up in an ungrounded
conductor and jumping to another conductor brought close to it. - ✔✔Arcing
✔✔57. A _______ Bonds the cabinet to the system neutral terminal. - ✔✔Bonding
screw
✔✔58. Ground wire should never be attached to _______ pipe. - ✔✔Plastic
✔✔59. The only place the house neutral should be bonded to the ground is at the
_______. - ✔✔Service box
✔✔60. Load-center power distribution systems _______. - ✔✔Enable the use of
combined power and light systems
✔✔61. The load in a sign branch circuit must not exceed _______ amperes. - ✔✔20
✔✔62. For a single-family house that has an initial computer load of 10kw or more, the
minimum ampacity allowed by code is a _______-amp 130/240-volt, 3 wire service
supplied by three wires. - ✔✔100
✔✔63. For fused service equipment larger than the minimum required by code,
_______ with a smaller ampacity rating and the ampere rating of the switch may be
used, providing the switch used does not have a higher ampere rating than the
ampacity of the wires. - ✔✔Service wires
, ✔✔64. If the ampacity of a no. 10 wire is 30 amp, the minimum size wire for a 30-amp
service is _______. - ✔✔No. 8
✔✔65. The demand factor applied to that portion of an unbalanced neutral feeder load
in excess of 200 amps is _______%. - ✔✔70
✔✔66. The code required for lighting load for a school is _______ watts per sq. ft. -
✔✔3
✔✔67. _______ as applied to motor-compressors, is defined as the current resulting
when a motor-compressor is operated at rated load, rated voltage and rated frequency
of the equipment it serves. - ✔✔Rated load current
✔✔68. Frequent _______ may occur if a house served by a 120/240-volt service has
the hot wires of the branch circuits unevenly divided. - ✔✔Tripping of breakers
✔✔69. The minimum number of conductors required for combined power and lighting in
a star of wye 3-phase system is _______. - ✔✔4
✔✔70. _______ has turns common to both the primary and secondary. - ✔✔An
autotransformer
✔✔71. A combined light and power wiring system _______. - ✔✔Simplifies a large
wiring job
✔✔72. Direct-current iron-core transformers are not used in combination light and
power systems because they _______. - ✔✔Don't exist
✔✔73. The resistance for aluminum wire has a _______ higher factor than the same
size copper wire. - ✔✔1.6
✔✔74. In a 3-phase, 4-wire delta system , the neutral conductor _______. - ✔✔Must be
smaller than the phase conductors
✔✔75. Lighting conductors must be kept _______ ft. From communication conductors
on the same building. - ✔✔6
✔✔76. In residential wiring, 3-phase 4 wire systems are used for _______. - ✔✔Water
heaters and lighting, 240Y/120 volts and lighting and large appliances
✔✔77. A _______ test ensures the equipment grounding conductor is electrically
continuous. - ✔✔Continuity
