Texas Master Sign Electrician Comprehensive Prep: 250+ Verified Q&A | NEC 2026 & TDLR Rules Mastery

Texas Master Sign Electrician Comprehensive Exam Prep (NEC 2026 &
TDLR Rules)

This premium 250-question practice bank is specifically engineered to help you pass the
Texas Master Sign Electrician Exam on your first attempt. It provides a deep dive into
NEC Article 600, essential grounding and bonding requirements under Article 250, and
the mandatory TDLR Administrative Rules for the State of Texas. Every question
includes a detailed technical rationale and direct code references to ensure you master
the calculations and legal requirements of the trade.


1.
Each commercial building or occupancy accessible to pedestrians shall be provided
with at least one sign outlet at each entrance, rated at a minimum of:
A. 15 amps
B. 20 amps
C. 30 amps
D. 50 amps
Answer: B. 20 amps
Rationale: NEC 600.5(A) requires a 20-amp branch circuit for these required sign
outlets.
2. A sign disconnect must be within sight of the sign. If it is not, the disconnect must
be:
A. Marked with a red "Danger" sign
B. Permanently bridged
C. Capable of being locked in the open position
D. Installed in a NEMA 3R enclosure
Answer: C. Capable of being locked in the open position
Rationale: NEC 600.6(A)(1) allows for remote disconnects only if they are
lockable and the provision for locking remains in place.
3. What is the maximum number of branch circuits allowed to be used for a single
sign?
A. 1
B. 2
C. 4
D. No limit, as long as they are grouped
Answer: D. No limit, as long as they are grouped

, Rationale: NEC 600.5(B) states that signs can be supplied by multiple circuits,
provided the disconnects for all circuits are grouped.
4. Section 600.32(A) requires that neon high-voltage secondary circuit conductors
be:
A. Copper, solid or stranded
B. Aluminum only
C. Not smaller than 18 AWG
D. Rated for 600 volts
Answer: A. Copper, solid or stranded
Rationale: Secondary high-voltage conductors for neon must be copper and
sized per the transformer rating (often 14 AWG or 12 AWG).
5. Under Texas TDLR Rules, a Master Sign Electrician must have at least how
many hours of on-the-job training?
A. 4,000 hours
B. 8,000 hours
C. 12,000 hours
D. 16,000 hours
Answer: C. 12,000 hours
Rationale: TDLR Rule 73.21 requires 12,000 hours of experience under the
supervision of a Master or Master Sign Electrician.
6. What is the maximum rating of a branch circuit supplying a sign consisting of
neon tubing?
A. 20 amps
B. 30 amps
C. 50 amps
D. 60 amps
Answer: B. 30 amps
Rationale: NEC 600.5(B)(1) limits the rating of branch circuits for neon tubing to
30 amps or less.
7. Metal parts of signs shall be bonded to the:
A. Nearest water pipe
B. Equipment grounding conductor of the branch circuit
C. Neutral conductor
D. Building steel only
Answer: B. Equipment grounding conductor of the branch circuit

, Rationale: NEC 600.7(B)(1) requires bonding of all metal parts to the equipment
grounding conductor (EGC).
8. For a field-installed skeleton tubing system, a transformer shall not have a
secondary voltage exceeding:
A. 5,000 volts
B. 7,500 volts
C. 15,000 volts
D. 30,000 volts
Answer: C. 15,000 volts
Rationale: NEC 600.32(J) limits the secondary voltage of neon transformers to
15,000 volts.
9. According to TDLR, a person who holds a Master Sign Electrician license may:
A. Only install signs
B. Perform any electrical work in a residence
C. Install and maintain signs and outline lighting
D. Design power plants
Answer: C. Install and maintain signs and outline lighting
Rationale: The scope of a Master Sign license is limited to signs, outline lighting,
and the associated branch circuits per Texas Occupations Code.
10. When installing high-voltage cable for neon, it must be installed in:
A. EMT or other approved raceways
B. Free air without support
C. PVC Schedule 40 only
D. Romex (NM cable)
Answer: A. EMT or other approved raceways
Rationale: NEC 600.32(A)(1) requires high-voltage conductors to be installed in
listed raceways or as otherwise permitted.
11. Wood used for signs shall be:
A. Painted red
B. Pressure-treated or otherwise protected from decay
C. At least 2 inches thick
D. Avoided entirely
Answer: B. Pressure-treated or otherwise protected from decay
Rationale: NEC 600.9(D) requires wood used for external parts of signs to be
durable and protected.

, 12. A sign transformer is considered a:
A. Non-continuous load
B. Continuous load
C. Intermittent load
D. Peak load
Answer: B. Continuous load
Rationale: NEC 600.5(B) and general trade practice treat signs as continuous
loads, requiring a 125% multiplier for circuit sizing.
13. What is the minimum size of a bonding jumper used for a sign?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
Answer: A. 14 AWG
Rationale: NEC 600.7(B)(2) states that the bonding jumper shall not be smaller
than 14 AWG copper.
14. The secondary circuit of a neon transformer is:
A. Effectively grounded
B. Always ungrounded
C. Allowed to be grounded or ungrounded
D. Connected to the neutral
Answer: C. Allowed to be grounded or ungrounded
Rationale: Most modern neon transformers are mid-point grounded, but NEC
allows for various configurations depending on the listing.
15.What is the maximum load of an LED driver-supplied sign on a 20-amp branch
circuit?
A. 12 amps
B. 15 amps
C. 16 amps
D. 20 amps
Answer: C. 16 amps
Rationale: Since it is a continuous load, you can only use 80% of the circuit rating
(