
Federal Signal
AD-26A-7
Alternate Item Number: ad-26-atkinson-dynamics-intercom
UPC: 782979205821
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Overview
- 12VDC power rating for industrial compatibility
- T/L (Talk/Listen) switch for easy audio control
- Integrated volume control for clear audio in noisy environments
- Call button for quick conversation initiation
- Microphone-ready design supports external audio input
Specifications
-31 to 150 | DEG F |
12 | VDC |
12 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 |
Mounting Type | Wall/Panel/Equipment Mount |
Number Of Lines | One |
Operating Current | 1.47 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 | 12VDC |
Series | AD |
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 | 12 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-26P-8-M44
Intercom, 12VDC, T/L Switch, Volume Control, Pre-Amp Equipped, Remote Volume Control Equipped, Panel Mount
AD-26PC-1
Atkinson Dynamics Panel Mount Intercom, 12VDC, Primary Unit, Remote Power - Heavy duty tamper resistant intercom. Single channel, two-way communications. Integrated volume control and Talk/Listen switch. Requires matching Atkinson Dynamics speaker (Model AD-SF-25, AD-SS-25 or AD-SO-25). Available in 12VDC, 24VDC and 120VAC 50/60Hz. UL and cUL Listed.
AD-26-8-M44
Intercom, 12VDC, T/L Switch, Volume Control, Pre-Amp Equipped, remote Volume Control equipped
AD-26C-4
Atkinson Dynamics Wall Mount Intercom, 12VDC, Primary 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.Frequently Asked Questions
What are the available power options for these intercoms?
These intercoms are available in 12VDC, 24VDC, 120VAC, or 240VAC 50/60Hz models.
What type of enclosure do these intercoms have?
The intercoms feature a corrosion-resistant cast aluminum housing with a rugged powder coat finish, classified as a Type 4X enclosure.
What is the speaker rating for these intercoms?
Each intercom is equipped with a reliable 25-watt speaker.
What are the operating temperature limits?
The operating temperature range for these intercoms is -31°F to 150°F (-35°C to 66°C).
What are the physical dimensions of the intercoms?
The intercoms have a height of 9.88 in, a width of 6.50 in, and a depth of 5.03 in.
Are these intercoms certified for marine use?
Yes, these heavy-duty units are Marine rated, UL and cUL listed, and CSA Certified.
What is the frequency response of the intercoms?
The frequency response for all models is 320Hz - 8.0Khz.
What is the net weight of an intercom unit?
The net weight of an intercom unit is 9 lbs (4.08 kg).
Do all optional features work with every model?
No, not all optional features are available for every model. Customers should consult the factory to confirm model variation availability.
What is the intended application for these intercoms?
They are designed for single-channel, two-way indoor and outdoor communication applications as heavy-duty industrial intercoms.
How to Install the AD-26A-7 Intercom
This guide provides step-by-step instructions for installing and configuring the AD-26A-7 intercom system, ensuring proper setup for effective communication.
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, ensuring it can support the weight of the unit.
- Mount the intercom
Secure the intercom to the selected surface using the two mounting ears and appropriate screws. Ensure it is level and firmly attached.
- Connect the power supply
Plug the intercom into a nearby power source. For AC models, connect the hot, neutral, and ground wires according to the power connection diagram.
- Wire the audio connections
Connect the audio inputs in parallel using properly sized audio cables. Optionally, install the provided 1K, 1W resistor across the audio lines to reduce noise.
- Test the installation
Once all connections are made, restore power and test the intercom system to ensure all units are functioning correctly.
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.

