Free Practice Questions for Arizona Low Voltage Practice

Explanation: The Arizona Registrar of Contractors (ROC) issues the C-12 Low Voltage Communication Systems license. The ROC regulates the construction industry in Arizona, processing license applications, investigating complaints, and enforcing contractor licensing laws.

Explanation: The Arizona C-12 classification covers Low Voltage Communication Systems. This license allows contractors to install, alter, and repair low voltage systems including fire alarms, security systems, structured cabling, audio/video systems, and other communication systems operating at low voltage levels.

Explanation: The C-12 license covers Low Voltage Communication Systems for commercial and residential projects without limitation. The L-67 is a limited residential classification. Both are issued by the Arizona Registrar of Contractors, but the L-67 has scope limitations for residential low voltage work.

Explanation: NEC Article 725 classifies remote-control, signaling, and power-limited circuits into Class 1, Class 2, and Class 3. Class 1 circuits can operate up to 600V and follow standard wiring methods. Class 2 and Class 3 circuits are power-limited and have reduced installation requirements due to their inherent safety.

Explanation: NEC Article 760 covers fire alarm system wiring, including both power-limited fire alarm (PLFA) and non-power-limited fire alarm (NPLFA) circuits. This article addresses cable types, installation methods, separation requirements, and other provisions specific to fire alarm system wiring.

Explanation: Arizona requires C-12 licensed contractors to maintain a surety bond as determined by the Registrar of Contractors. The bond amount is based on the contractor's volume of work and provides financial protection for consumers. Failure to maintain the required bond can result in license suspension.

Explanation: Class 2 power sources are limited to a maximum of 100 volts per NEC Chapter 9, Table 11(A). However, the current and power are also limited. Most practical Class 2 applications use 12V or 24V DC power supplies. The power limitation allows simplified wiring methods for these circuits.

Explanation: CMP (Communications Plenum) rated cable must be used in plenum air-handling spaces. Plenum cable has fire-resistant and low-smoke properties that minimize toxic fume production if the cable burns. Using non-plenum cable in these spaces violates the NEC and building codes.

Explanation: An EOL resistor is placed at the last device on a fire alarm initiating device circuit to provide supervision. The fire alarm control panel monitors the steady-state current through the resistor. An open circuit (broken wire) causes loss of current, and a short circuit causes excess current — both generate a trouble condition on the panel.

Explanation: TIA-568 specifies a maximum horizontal cable run of 90 meters from the telecommunications room to the work area outlet. The remaining 10 meters of the 100-meter total channel is allocated for patch cords and equipment cords at both ends. This distance limitation applies to all categories of UTP copper cable.