
Federal Signal
AD-56-7
Alternate Item Number: ad-56-atkinson-dynamics-intercom
UPC: 782979205524
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Overview
- 24VDC operation for industrial power compatibility
- Built-in Talk/Listen (T/L) switch for clear two-way communication
- Integrated volume control for optimal audio levels
- Microphone-ready design for flexible external audio input
- Compact, durable housing resists dust, moisture, and shock
Specifications
-31 to 150 | DEG F |
24 | VDC |
24 Vdc | V |
5.03 | IN |
6.5 | in |
9.88 | IN |
Application | Indoor/Outdoor |
Brand Name | Federal Signal |
Enclosure | Type 4X |
Frequency Response | 320 Hz - 8.0 kHz |
Height | 9.88 IN |
Length | 5.03 IN |
Mounting | Wall |
Number Of Lines | One |
Operating Current | 1.65 AMP |
Operating Temperature | -31 to 150 DEG F |
Operating Temperature, Maximum | 150 F |
Operating Temperature, Maximum | 65.5556 C |
Operating Temperature, Minimum | -31 F |
Operating Temperature, Minimum | -35 C |
Operating Voltage | 24VDC |
Special Features | Balanced Line Output |
Standard | UL Listed/cUL Listed/CSA Certified/Marine Listed |
Standard | CSA,Marine,UL,cUL |
Sub Brand | Atkinson Dynamics |
Type | Wall Mount Intercom |
Type | Intercoms |
Voltage Rating | 24 Vdc |
Width | 6.5 IN |
Package Dimensions (L x W x H) | 8.13 IN x 7.25 IN x 15.13 IN |
Package Dimensions (L x W x H) | 20.6502 cm x 18.415 cm x 38.4302 cm |
Package Weight (Imperial) | 10.000 L |
Package Weight (Metric) | 4.536 kg |

AD-56C-7
Atkinson Dynamics Wall Mount Intercom, 24VDC, Primary Unit, Microphone Ready - Available in 12VDC, 24VDC, 120VAC or 240VAC. Heavy-duty industrial intercom for indoor or outdoor applications. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Balanced line output. 25 watt speaker. Cast aluminum housing with rugged powder coat finish. Conformal coated PCB. Type 4X enclosure. Marine Listed. CSA Certified. UL and cUL Listed.
AD-56D
Atkinson Dynamics Wall Mount Intercom, 24VDC, Secondary Unit - Available in 12VDC, 24VDC, 120VAC or 240VAC. Heavy-duty industrial intercom for indoor or outdoor applications. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Balanced line output. 25 watt speaker. Cast aluminum housing with rugged powder coat finish. Conformal coated PCB. Type 4X enclosure. Marine Listed. CSA Certified. UL and cUL Listed.
AD-56C
Atkinson Dynamics Wall Mount Intercom, 24VDC, Primary Unit - Available in 12VDC, 24VDC, 120VAC or 240VAC. Heavy-duty industrial intercom for indoor or outdoor applications. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Balanced line output. 25 watt speaker. Cast aluminum housing with rugged powder coat finish. Conformal coated PCB. Type 4X enclosure. Marine Listed. CSA Certified. UL and cUL Listed.
AD-56D-4
Atkinson Dynamics Wall Mount Intercom, 24VDC, Secondary Unit, Extreme Conditions - Available in 12VDC, 24VDC, 120VAC or 240VAC. Heavy-duty industrial intercom for indoor or outdoor applications. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Balanced line output. 25 watt speaker. Cast aluminum housing with rugged powder coat finish. Conformal coated PCB. Type 4X enclosure. Marine Listed. CSA Certified. UL and cUL Listed.
310X-MV
AudioMaster Two-Way Intercom, Hazardous Location, UL and cUL CID2, Multi-voltage 24VDC or 120-240VAC
AD-26-8-M44
Intercom, 12VDC, T/L Switch, Volume Control, Pre-Amp Equipped, remote Volume Control equippedFrequently Asked Questions
What are the main applications for these intercoms?
These intercoms are designed for single-channel, two-way indoor and outdoor communication applications.
What power options are available for the intercoms?
The intercoms are available in 12VDC, 24VDC, 120VAC, or 240VAC 50/60Hz models.
What is the operating voltage for the AD-56 model?
The AD-56 model operates on 24VDC.
What is the operating current for the AD-56 intercom?
The AD-56 model has an operating current of 1.65 A and a standby current of 100 mA.
What is the speaker rating of the intercom?
The intercom features a 25-watt speaker.
What is the operating temperature range?
The operating temperature range is -31°F to 150°F (-35°C to 66°C).
What type of enclosure does the intercom have?
The intercom features a Type 4X enclosure with a corrosion-resistant cast aluminum housing and powder coat finish.
What are the dimensions of the intercom unit?
The intercom has a height of 9.88 in, a width of 6.50 in, and a depth of 5.03 in.
What certifications do these intercoms hold?
These heavy-duty units are UL and cUL listed, CSA Certified, and Marine rated.
What is the net weight of the intercom?
The net weight of the intercom is 9 lbs (4.08 kg).
How to Install the AD-56-7 Intercom
This guide provides step-by-step instructions for installing and configuring the AD-56-7 intercom system, ensuring proper wiring and setup for optimal performance.
Estimated time: 45m
Tools needed:
Screwdriver, Wire strippers, Multimeter
Supplies needed:
Mounting screws, 1K, 1W resistor, Audio cables
- Select the mounting location
Choose a flat and rigid surface for mounting the intercom. Ensure the location is accessible for wiring and maintenance.
- Mount the intercom
Secure the intercom to the selected surface using the provided mounting screws through the mounting ears. Ensure it is level and firmly attached.
- Connect the power supply
Plug the intercom into a nearby power source. For the AD-56-7 model, connect the black wire to +DC power, the white wire to common, and the green wire to earth ground.
- Wire the audio connections
Connect the audio inputs in parallel using appropriate audio cables. Ensure the cables are sized correctly for your installation.
- Install the resistor
If necessary, install the included 1K, 1W resistor across the audio lines to reduce noise. Only one resistor is needed for the entire system.
- Test the intercom
Once all connections are made, restore power and test the intercom system by pressing the talk switch and speaking into the microphone.
Frequently Asked Questions about Federal Signal
What certifications and standards do Federal Signal products comply with?
Federal Signal products are certified across multiple international standards, including UL (Underwriters Laboratories) in the USA, CSA (Canadian Standards Association), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia and New Zealand). Their products meet rigorous safety and performance standards for industrial environments, with specific compliance in electrical equipment enclosures, functional safety, and environmental protection ratings.
What is Federal Signal's warranty policy?
Federal Signal offers a comprehensive limited warranty covering most products for 1-5 years from the date of delivery, with specific terms varying by product category. Mechanical sirens, beacons, speakers, and sounders typically receive 5-year parts and labor coverage, while electronic sirens and controllers generally have 2-year warranties. All warranties require return to the factory for service, and on-site services are not included. Certain components like domes, lenses, lamps, and batteries are specifically excluded from warranty coverage.
What industries and applications are Federal Signal products used for?
Federal Signal products are used across multiple critical industrial and municipal sectors for notification, communication, and safety systems. Their product lines cover essential applications including fire alarm systems, public address and telephony, outdoor warning systems, visual and audible signals, and emergency communication networks. Key industries served include manufacturing, municipal emergency services, industrial facilities, and infrastructure environments where clear, reliable communication and safety signaling are paramount.
What technical support does Federal Signal offer?
Federal Signal offers comprehensive technical support through their dedicated [email protected] email and direct phone line at +1 708.534.4756. Their support covers a wide range of notification and communication solutions, including technical assistance for products in public address, telephony, fire alarm, visual and audible signals, outdoor warning systems, and intercoms.
What are the main product lines offered by Federal Signal?
Federal Signal offers comprehensive notification and communication solutions across multiple product lines, including Visual Signals, Audible Signals, Telephony, Intercoms, Fire Alarm, Outdoor Warning Systems, Public Address, and Initiating Systems. Their product range is designed to provide clear communications and critical process notifications that enhance safety and compliance in industrial and public environments.
What are the key features of Federal Signal products?
Federal Signal products are comprehensive notification solutions designed to enhance safety and communication across industrial environments. Their key features include visual and audible signals, fire alarm systems, outdoor warning systems, public address capabilities, telephony, and intercoms. These products provide critical process notifications, ensure safety compliance, and offer advanced technologies like secure encrypted communication, cloud-based control systems, and customizable emergency response interfaces.
What environmental ratings do Federal Signal products have?
Federal Signal products offer robust environmental ratings across multiple standards, including UL 508A, CSA, NEMA, and IEC 60529. Their enclosures are rated for Type 1, 2, 3, 4, 4X, 12, and 13 environments, with IP66 protection, and can operate in temperatures ranging from -40°F to 266°F. These ratings ensure superior protection against dust, water, corrosion, and extreme conditions for indoor and outdoor industrial applications.
What accessories are available for Federal Signal products?
Federal Signal offers multiple accessories for their signaling products, including coupling kits, cable entry adapters, indicator rings, legend plates, and mounting brackets. Key accessories include E-Box endcap kits with M20 and M25 openings, U-Brackets for dual configurations, and color-coded indicator rings in black, blue, green, magenta, red, and yellow. Additional options like adapters for NPT connections and specialized mounting hardware are also available for their Global Series signaling platforms.
What communication protocols do Federal Signal products support?
Federal Signal supports multiple industrial communication protocols including PROFIBUS DP, PROFINET, EtherNet/IP, CANopen, and Modbus RTU. These protocols enable flexible network integration across various industrial automation environments, supporting both traditional fieldbuses and modern Ethernet-based communication standards.
How are Federal Signal products typically installed?
Federal Signal products are typically installed using professional mounting configurations that include wall brackets, base stations, and specialized mounting hardware. Depending on the specific product line—such as outdoor warning systems, visual signals, or audible signals—installation involves precise mounting options like wall-mount antenna brackets, base station radio packages, and modular component assemblies. Each product configuration includes specific mounting accessories like endcaps, adapters, and terminal blocks to ensure secure and compliant installation in industrial and safety-critical environments.

