​brushing Up On Panels & Enclosures

The statement is false because even though the wires going into the enclosure of a burglar alarm may be low voltage, there is still a requirement for bushings or fittings. These components are necessary to protect the wires from damage and ensure proper insulation and connection.

A fire alarm system requires a dedicated branch circuit and locked breaker rated at no greater than 20 amps because this ensures that the circuit can handle the electrical load of the fire alarm system without overloading. It is important for the breaker to be locked to prevent accidental or unauthorized tampering with the circuit. Additionally, a higher amp rating could potentially cause damage to the fire alarm system or create a safety hazard.

Burglar alarm panels operate within specific temperature ranges specified by the manufacturer. This means that the panels are designed to function properly and reliably within certain temperature limits. Operating outside of these specified temperature ranges may result in malfunctions or failure of the alarm system. It is important to adhere to the manufacturer's guidelines to ensure the effectiveness and longevity of the burglar alarm panels.

B – NEC 2014 110.26(A)(1)(b)

A dedicated branch circuit is required for a fire alarm panel because fire alarm systems require their own dedicated power supply to ensure they have a reliable source of electricity. This helps to prevent any potential power disruptions or interference from other electrical devices that may be connected to the same circuit. By having a dedicated branch circuit, the fire alarm panel can operate independently and maintain its functionality even during power outages or electrical issues in the building.

The statement suggests that all alarm panel enclosures are UL listed for commercial applications, otherwise they wouldn't be manufactured. However, this is not necessarily true. While it is common for alarm panel enclosures to be UL listed for commercial applications, it is not a requirement for their manufacturing. Some alarm panel enclosures may be manufactured without UL listing, especially for non-commercial or residential use. Therefore, the correct answer is false.

The attic is not a suitable location for the alarm panel because it is typically not easily accessible and may be subject to extreme temperatures, which can affect the functioning of the panel. Additionally, in case of an emergency, it would be difficult to quickly reach the panel if it is located in the attic.

When the source of the alarm notification voltage is the control panel, the output is considered "wet". This means that the control panel is providing power to the alarm circuit, allowing it to function properly. In contrast, a "dry" output would indicate that the control panel is not supplying power to the circuit, rendering the alarm non-functional.

C – UL 464, NTS Level 1

When two speakers are connected in parallel, the total resistance of the circuit decreases. This is because in a parallel circuit, the total resistance is inversely proportional to the sum of the reciprocals of the individual resistances. So, when the speakers are connected in parallel, the combined resistance decreases, allowing more current to flow through the circuit. This results in a louder sound as the speakers share the load and produce a stronger output.

D – NEC 2014 110.26(A)(2)

B – NEC 2014, 210.8(A)(5) exception

Alarm panel circuit boards do not have built-in transformers to reduce 110VAC to usable DC voltage for charging the backup battery. Transformers are typically used to convert voltage levels, but in this case, it is not necessary as the circuit board can directly convert the AC voltage to DC voltage for charging the battery. Therefore, the correct answer is false.

C – NTS Level 1 Course

B – NEC 2014, 210.52(B)(2)