VOICE DATA VIDEO VDV 2025 QUESTIONS WITH
SOLUTIONS RATED A+
✔✔Communication wires and cables shall have a voltage rating of not less than 300
volts. The insulation for the individual conductors, other than the outer conductor of a
coax cable, shall be rated for _______ minimum.
a. 90 volts
b. 120 volts
c. 300 volts
d. 600 volts - ✔✔c. 300 volts
REF: [NEC] 800.179
✔✔The communications primary protector grounding conductor in one and two family
dwellings shall not exceed _____.
a. 6 feet
b. 15 feet
c. 20 feet
d. 9 meters - ✔✔c. 20 feet
REF: [NEC] 800.100(A)(4)
✔✔Only these types of cables shall be permitted to be installed in listed riser CATV
raceways in vertical riser runs from floor to floor.
a. CATVR, CATVP
b. CATVR, CATVX
c. CATVR, CATV
d. CATVR, CMG, CM, CATVP - ✔✔a. CATVR, CATVP
REF: [NEC] 820.113(D)(1)
✔✔For communication circuits, if a building has no intersystem bonding termination but
does have a grounding means, the grounding conductor shall be connected to the
nearest accessible location on the following except _______.
a. interior water system within 5 feet, metallic power service raceway, service
equipment enclosure
b. interior water system within 5 feet, metallic power service raceway, the power service
accessible means external to enclosures as covered i 250.94
c. interior water system within 5 feet, metallic power service raceway, the grounding
electrode conductor or the grounding electrode conductor metal enclosure
d. interior water system within 5 feet, metallic power service raceway, service
equipment enclosure, equipment enclosure door or cover - ✔✔d. interior water system
within 5 feet, metallic power service raceway, service equipment enclosure, equipment
enclosure door or cover
,REF: [NEC] 800.100(B)(1-7)
✔✔What is the best way to protect against voltage spikes in a DC circuit?
a. add a capacitor across the contacts
b. add a diode across the relay coil
c. use an in-line fuse on the common wire of the contact
d. use an isolation transformer - ✔✔b. add a diode across the relay coil
✔✔The voltage rating on CATV coaxial cables _______.
a. shall not be marked on the cable
b. voltage ratings shall be marked where the cable has multiple listings and is required
for one of those listings
c. a and b
d. none of the above - ✔✔c. a and b
REF: [NEC] 820.179 Exception
✔✔CATV coaxial cable lead-in conductors shall provide clearances of not less than
_______ from electric light and power where the proximity to electric light and power
cannot be avoided.
a. 100 mm (4 in)
b. 300 mm (12 in.)
c. 1.2 m (40 in.)
d. 2.5 m (8 ft.) - ✔✔b. 300 mm (12 in.)
REF: [NEC] 820.44(A)(4) Exception
✔✔Communications wires and cables without a metallic shield, running from the last
outdoor support to the primary protector, shall be separated by _______ from electric
light or power conductors not in a raceway or cable.
a. 3 feet
b. 4 feet
c. 2 inches
d. 4 inches - ✔✔d. 4 inches
REF: [NEC] 800.50 (B), 800.50 (A)
✔✔What type of cable tester is also called a pair scanner?
a. OTDR
b. wiremap tester
c. OLTS
d. receptacle tester - ✔✔b. wiremap tester
,✔✔All conductors installed inside a radio and television equipment transmitting station
shall be separated by at least ________ from the conductors of any electric light, power
or signaling circuit.
a. 50 mm (2 in.)
b. 75 mm (3 in.)
c. 100 mm (4 in.)
d. 300 mm (12 in.) - ✔✔c. 100 mm (4 in.)
REF: [NEC] 810.70
✔✔The communications primary protector shall not be located in any classified
hazardous location or in the vicinity of this _______.
a. easily ignitable material
b. electrical equipment immersed in a protective oil
c. an enclosure that is pressurized with a protective gas
d. all of the above - ✔✔a. easily ignitable material
REF: [NEC] 800.90(C)
✔✔CATV coaxial cables shall have a vertical clearance of not less than ______, where
the roof has a slope of not less than 100 mm in 300 mm (4 in. in 12 in.).
a. 450 mm (18 in.)
b. 1.2 m (4 ft.)
c. 2.5 m (8 ft.)
d. 900 mm (3 ft.) - ✔✔d. 900 mm (3 ft.)
REF: [NEC] 820.44(B) Exception #3
✔✔What is the standard telecommunications rack width?
a. 22 inches
b. 24 inches
c. 19 inches
d. 16 inches - ✔✔c. 19 inches
✔✔The communications Point of Entrance is defined by the NEC as the point at which
the wire emerges from which of the following?
a. Concrete floor slab
b. Rigid metal conduit
c. Terminal Box
d. Both a and b - ✔✔d. Both a and b
REF: [NEC] 800.2
, ✔✔The communication primary protectors, at mobile home service equipment with a
disconnecting means that is connected to an electrode by a grounding conductor, must
be located within ________ of these exterior wall.
a. 6 meters
b. 9 feet
c. 15 meters
d. 30 feet - ✔✔d. 30 feet
REF: [NEC] 800.106(A)
✔✔Radio and television equipment outdoor antennas and lead-in conductors, where
proximity to open electric light or power service conductors of less than ______
between conductors cannot be avoided, the installations shall be such as to provide a
clearance of at least ______.
a. 300 volts, 4 feet
b. 150 votls, 3 feet
c. 250 volts, 2 feet
d. 600 volts, 10 feet - ✔✔c. 250 volts, 2 feet
REF: [NEC] 810.13
✔✔The clearance of radio and television equipment lead in conductors outside of a
receiving station where the circuit voltage is less than 150 volts shall not be less than
_______.
a. 2 inches
b. 4 inches
c. 2 feet
d. 10 feet - ✔✔b. 4 inches
REF: [NEC] 810.18(A)
✔✔If you have a return air ceiling, what kind of cable would you install?
a. Coax
b. CMG
c. Fiber
d. CMP - ✔✔d. CMP
✔✔Communications conductors shall not be placed in any raceway with conductors of
electric light, power, Class 1, non-power-limited fire alarm, or medium power broadband
communications circuits unless _______.
a. they are separated by a permanent barrier or listed dividers,
b. they can never be ran together
SOLUTIONS RATED A+
✔✔Communication wires and cables shall have a voltage rating of not less than 300
volts. The insulation for the individual conductors, other than the outer conductor of a
coax cable, shall be rated for _______ minimum.
a. 90 volts
b. 120 volts
c. 300 volts
d. 600 volts - ✔✔c. 300 volts
REF: [NEC] 800.179
✔✔The communications primary protector grounding conductor in one and two family
dwellings shall not exceed _____.
a. 6 feet
b. 15 feet
c. 20 feet
d. 9 meters - ✔✔c. 20 feet
REF: [NEC] 800.100(A)(4)
✔✔Only these types of cables shall be permitted to be installed in listed riser CATV
raceways in vertical riser runs from floor to floor.
a. CATVR, CATVP
b. CATVR, CATVX
c. CATVR, CATV
d. CATVR, CMG, CM, CATVP - ✔✔a. CATVR, CATVP
REF: [NEC] 820.113(D)(1)
✔✔For communication circuits, if a building has no intersystem bonding termination but
does have a grounding means, the grounding conductor shall be connected to the
nearest accessible location on the following except _______.
a. interior water system within 5 feet, metallic power service raceway, service
equipment enclosure
b. interior water system within 5 feet, metallic power service raceway, the power service
accessible means external to enclosures as covered i 250.94
c. interior water system within 5 feet, metallic power service raceway, the grounding
electrode conductor or the grounding electrode conductor metal enclosure
d. interior water system within 5 feet, metallic power service raceway, service
equipment enclosure, equipment enclosure door or cover - ✔✔d. interior water system
within 5 feet, metallic power service raceway, service equipment enclosure, equipment
enclosure door or cover
,REF: [NEC] 800.100(B)(1-7)
✔✔What is the best way to protect against voltage spikes in a DC circuit?
a. add a capacitor across the contacts
b. add a diode across the relay coil
c. use an in-line fuse on the common wire of the contact
d. use an isolation transformer - ✔✔b. add a diode across the relay coil
✔✔The voltage rating on CATV coaxial cables _______.
a. shall not be marked on the cable
b. voltage ratings shall be marked where the cable has multiple listings and is required
for one of those listings
c. a and b
d. none of the above - ✔✔c. a and b
REF: [NEC] 820.179 Exception
✔✔CATV coaxial cable lead-in conductors shall provide clearances of not less than
_______ from electric light and power where the proximity to electric light and power
cannot be avoided.
a. 100 mm (4 in)
b. 300 mm (12 in.)
c. 1.2 m (40 in.)
d. 2.5 m (8 ft.) - ✔✔b. 300 mm (12 in.)
REF: [NEC] 820.44(A)(4) Exception
✔✔Communications wires and cables without a metallic shield, running from the last
outdoor support to the primary protector, shall be separated by _______ from electric
light or power conductors not in a raceway or cable.
a. 3 feet
b. 4 feet
c. 2 inches
d. 4 inches - ✔✔d. 4 inches
REF: [NEC] 800.50 (B), 800.50 (A)
✔✔What type of cable tester is also called a pair scanner?
a. OTDR
b. wiremap tester
c. OLTS
d. receptacle tester - ✔✔b. wiremap tester
,✔✔All conductors installed inside a radio and television equipment transmitting station
shall be separated by at least ________ from the conductors of any electric light, power
or signaling circuit.
a. 50 mm (2 in.)
b. 75 mm (3 in.)
c. 100 mm (4 in.)
d. 300 mm (12 in.) - ✔✔c. 100 mm (4 in.)
REF: [NEC] 810.70
✔✔The communications primary protector shall not be located in any classified
hazardous location or in the vicinity of this _______.
a. easily ignitable material
b. electrical equipment immersed in a protective oil
c. an enclosure that is pressurized with a protective gas
d. all of the above - ✔✔a. easily ignitable material
REF: [NEC] 800.90(C)
✔✔CATV coaxial cables shall have a vertical clearance of not less than ______, where
the roof has a slope of not less than 100 mm in 300 mm (4 in. in 12 in.).
a. 450 mm (18 in.)
b. 1.2 m (4 ft.)
c. 2.5 m (8 ft.)
d. 900 mm (3 ft.) - ✔✔d. 900 mm (3 ft.)
REF: [NEC] 820.44(B) Exception #3
✔✔What is the standard telecommunications rack width?
a. 22 inches
b. 24 inches
c. 19 inches
d. 16 inches - ✔✔c. 19 inches
✔✔The communications Point of Entrance is defined by the NEC as the point at which
the wire emerges from which of the following?
a. Concrete floor slab
b. Rigid metal conduit
c. Terminal Box
d. Both a and b - ✔✔d. Both a and b
REF: [NEC] 800.2
, ✔✔The communication primary protectors, at mobile home service equipment with a
disconnecting means that is connected to an electrode by a grounding conductor, must
be located within ________ of these exterior wall.
a. 6 meters
b. 9 feet
c. 15 meters
d. 30 feet - ✔✔d. 30 feet
REF: [NEC] 800.106(A)
✔✔Radio and television equipment outdoor antennas and lead-in conductors, where
proximity to open electric light or power service conductors of less than ______
between conductors cannot be avoided, the installations shall be such as to provide a
clearance of at least ______.
a. 300 volts, 4 feet
b. 150 votls, 3 feet
c. 250 volts, 2 feet
d. 600 volts, 10 feet - ✔✔c. 250 volts, 2 feet
REF: [NEC] 810.13
✔✔The clearance of radio and television equipment lead in conductors outside of a
receiving station where the circuit voltage is less than 150 volts shall not be less than
_______.
a. 2 inches
b. 4 inches
c. 2 feet
d. 10 feet - ✔✔b. 4 inches
REF: [NEC] 810.18(A)
✔✔If you have a return air ceiling, what kind of cable would you install?
a. Coax
b. CMG
c. Fiber
d. CMP - ✔✔d. CMP
✔✔Communications conductors shall not be placed in any raceway with conductors of
electric light, power, Class 1, non-power-limited fire alarm, or medium power broadband
communications circuits unless _______.
a. they are separated by a permanent barrier or listed dividers,
b. they can never be ran together
