CONNECTICUT L‑5 LIMITED ELECTRICAL CONTRACTOR (LOW VOLTAGE) - PRACTICE EXAM
1. Which Connecticut license is required to install, maintain, or repair low-voltage systems
like fire alarms, security systems, and telecommunications?
A) E‑1 Unlimited Electrical Contractor
B) L‑5 Limited Electrical Contractor (Low Voltage)
C) C‑5 Limited Electrical Contractor (Residential)
D) P‑1 Plumbing Contractor
Answer: B
Explanation: The L‑5 license specifically authorizes low-voltage electrical work as defined
by Connecticut law.
2. What is the maximum voltage allowed under the L‑5 license scope?
A) 50 volts
B) 100 volts
C) 240 volts
D) 600 volts
Answer: A
Explanation: The L‑5 license covers systems operating at 50 volts or less, except as
specifically permitted for certain control circuits.
3. The Connecticut Department of Consumer Protection (DCP) requires L‑5 contractors to
carry a minimum general liability insurance of:
A) $100,000
B) $500,000
C) $1,000,000
D) $2,000,000
Answer: C
,Explanation: Per CT regulations, L‑5 contractors must maintain a minimum of $1,000,000
in general liability insurance.
4. Which of the following systems CANNOT be installed under an L‑5 license?
A) Category 5e/6 network cabling
B) A 120V branch circuit for an office outlet
C) A Class 2 fire alarm initiating device circuit
D) A structured cabling backbone
Answer: B
Answer: A
Explanation: The L‑5 license covers systems operating at 50 volts or less, except as
specifically permitted for certain control circuits.
5. Under the Connecticut State Building Code, low-voltage wiring for security systems must
be installed in accordance with:
A) The National Electrical Code (NFPA 70)
B) Local utility company rules only
C) Manufacturer's recommendations only
D) The International Plumbing Code
Answer: A
Explanation: All electrical installations, including low-voltage, must comply with the
National Electrical Code (NEC) as adopted by Connecticut.
6. What is the primary purpose of the "Class 2" circuit designation in the NEC?
A) To indicate high-power circuits
B) To define limited power sources that pose reduced fire and shock risk
C) To label circuits over 600 volts
,D) To identify DC circuits only
Answer: B
Explanation: NEC Article 725 defines Class 2 circuits as those supplied by a source with
limits on voltage and power, providing safety from fire and electric shock.
7. Which NEC Article specifically covers wiring for fire alarm systems?
A) Article 640
B) Article 725
C) Article 760
D) Article 800
Answer: C
Explanation: NEC Article 760 covers the installation of wiring and equipment for fire alarm
systems, including power-limited circuits.
8. For a residential fire alarm installation, smoke detectors must be installed:
A) Only in the basement
B) In each sleeping room, outside each sleeping area, and on every level
C) Only in hallways
D) At the discretion of the installer
Answer: B
Explanation: NFPA 72 (National Fire Alarm Code) and building codes require this
placement for minimum life safety.
9. The maximum allowable voltage drop for a standard low-voltage security system power
supply to the last device is typically:
A) 1%
B) 5%
, C) 10%
D) 20%
Answer: C
Explanation: While NEC doesn't specify a exact percentage for all low-voltage systems,
industry standards (like SIA) and manufacturer specs often recommend limiting voltage
drop to 10% for reliable device operation.
10. When running low-voltage cable parallel to 120V electrical wiring in a residence, what is
the minimum separation distance required by NEC if not in a raceway?
A) They can be bundled together
B) 2 inches
C) 12 inches
D) No specific requirement
Answer: B
Explanation: NEC 725.136(I) requires a minimum separation of 2 inches from power
conductors unless separated by a barrier or installed in raceway.
11. What type of cable is required for in-wall installation of a Class 2 security system
circuit?
A) SJT cord
B) CL2 or CL2P rated cable
C) UF cable
D) Any lamp cord
Answer: B
Explanation: NEC Article 725 requires cables for Class 2 circuits to be listed for the
application. CL2 (Class 2) or CL2P (Plenum) are standard ratings for in-wall use.
12. A "plenum" rated cable (CMP/CL2P) is required when installing cable in:
1. Which Connecticut license is required to install, maintain, or repair low-voltage systems
like fire alarms, security systems, and telecommunications?
A) E‑1 Unlimited Electrical Contractor
B) L‑5 Limited Electrical Contractor (Low Voltage)
C) C‑5 Limited Electrical Contractor (Residential)
D) P‑1 Plumbing Contractor
Answer: B
Explanation: The L‑5 license specifically authorizes low-voltage electrical work as defined
by Connecticut law.
2. What is the maximum voltage allowed under the L‑5 license scope?
A) 50 volts
B) 100 volts
C) 240 volts
D) 600 volts
Answer: A
Explanation: The L‑5 license covers systems operating at 50 volts or less, except as
specifically permitted for certain control circuits.
3. The Connecticut Department of Consumer Protection (DCP) requires L‑5 contractors to
carry a minimum general liability insurance of:
A) $100,000
B) $500,000
C) $1,000,000
D) $2,000,000
Answer: C
,Explanation: Per CT regulations, L‑5 contractors must maintain a minimum of $1,000,000
in general liability insurance.
4. Which of the following systems CANNOT be installed under an L‑5 license?
A) Category 5e/6 network cabling
B) A 120V branch circuit for an office outlet
C) A Class 2 fire alarm initiating device circuit
D) A structured cabling backbone
Answer: B
Answer: A
Explanation: The L‑5 license covers systems operating at 50 volts or less, except as
specifically permitted for certain control circuits.
5. Under the Connecticut State Building Code, low-voltage wiring for security systems must
be installed in accordance with:
A) The National Electrical Code (NFPA 70)
B) Local utility company rules only
C) Manufacturer's recommendations only
D) The International Plumbing Code
Answer: A
Explanation: All electrical installations, including low-voltage, must comply with the
National Electrical Code (NEC) as adopted by Connecticut.
6. What is the primary purpose of the "Class 2" circuit designation in the NEC?
A) To indicate high-power circuits
B) To define limited power sources that pose reduced fire and shock risk
C) To label circuits over 600 volts
,D) To identify DC circuits only
Answer: B
Explanation: NEC Article 725 defines Class 2 circuits as those supplied by a source with
limits on voltage and power, providing safety from fire and electric shock.
7. Which NEC Article specifically covers wiring for fire alarm systems?
A) Article 640
B) Article 725
C) Article 760
D) Article 800
Answer: C
Explanation: NEC Article 760 covers the installation of wiring and equipment for fire alarm
systems, including power-limited circuits.
8. For a residential fire alarm installation, smoke detectors must be installed:
A) Only in the basement
B) In each sleeping room, outside each sleeping area, and on every level
C) Only in hallways
D) At the discretion of the installer
Answer: B
Explanation: NFPA 72 (National Fire Alarm Code) and building codes require this
placement for minimum life safety.
9. The maximum allowable voltage drop for a standard low-voltage security system power
supply to the last device is typically:
A) 1%
B) 5%
, C) 10%
D) 20%
Answer: C
Explanation: While NEC doesn't specify a exact percentage for all low-voltage systems,
industry standards (like SIA) and manufacturer specs often recommend limiting voltage
drop to 10% for reliable device operation.
10. When running low-voltage cable parallel to 120V electrical wiring in a residence, what is
the minimum separation distance required by NEC if not in a raceway?
A) They can be bundled together
B) 2 inches
C) 12 inches
D) No specific requirement
Answer: B
Explanation: NEC 725.136(I) requires a minimum separation of 2 inches from power
conductors unless separated by a barrier or installed in raceway.
11. What type of cable is required for in-wall installation of a Class 2 security system
circuit?
A) SJT cord
B) CL2 or CL2P rated cable
C) UF cable
D) Any lamp cord
Answer: B
Explanation: NEC Article 725 requires cables for Class 2 circuits to be listed for the
application. CL2 (Class 2) or CL2P (Plenum) are standard ratings for in-wall use.
12. A "plenum" rated cable (CMP/CL2P) is required when installing cable in:
