Intercom systems typically operate on low voltage power, typically between 12 and 24 volts DC or AC. This low voltage makes intercom systems safe for residential and commercial use and easy to install, requiring minimal electrical expertise. Low voltage power is sufficient to support the audio and video functionality of the intercom, facilitating communication between different units or locations within a building.
The choice between DC or AC power depends on the specific design and requirements of the intercom system.
The operating voltage of intercom systems is often standardized at 12 or 24 volts, depending on the manufacturer’s specifications and the complexity of the system. Most home intercoms are designed to operate within this range, providing adequate power for clear audio transmission and, where applicable, video display.
This voltage level ensures safe operation and allows the intercom system to seamlessly integrate with other low-voltage systems in the building, such as doorbells and access controls.
A house doorbell typically operates on a low voltage system, usually 16 volts AC. This voltage is supplied by a transformer connected to the home’s main power supply, reducing the standard 120 or 240 volt alternating current from the grid to a level that is safer and more manageable for the doorbell.
The 16 volt standard is widely used for its compatibility with various doorbell chimes and buzzers and for its ability to power multiple doorbells without risk of electrical hazard.
Electric locks, commonly used in access control systems, typically operate on 12 to 24 volts DC. This low voltage is necessary to safely power the solenoids or motors that control the door locking and unlocking mechanisms. Voltage is typically provided by a dedicated power supply or battery, allowing reliable, uninterrupted operation even in the event of a power outage.
The specific voltage required may vary depending on the design and functionality of the lock, with some systems offering additional features such as remote access or integration with security systems.
A telephone ringer, especially on traditional landline telephones, operates at a voltage of approximately 70 to 90 volts AC. This voltage is delivered across the telephone line to activate the ringing mechanism, producing a loud, distinct sound to alert users of an incoming call.
The high voltage is necessary to ensure that the buzzer is audible over ambient noise and can effectively signal the user. This voltage is typically transmitted as part of the telephone signaling system and is only present during the ringing phase of an incoming call.