Tag Archives: 5820XL-EVS

Internally Speaking: Applications Using the EVS-INT50W

I wrote a blog in May 2015 introducing our new EVS-INT50W internal amplifier. An overview of the product was provided along with a brief mention of applications. In this installment, I would like to discuss a few specific applications: Day Care Centers, Assembly Occupancies, K – 12 Educational Facilities, and Lodging.

evs-int50w-diagram1Day Care Centers is an ideal application for the internal amplifier because of limited wall space for mounting external hardware and the requirement for the 520Hz low frequency output. Many jurisdictions are adopting the 2012 edition of the International Building Code (IBC) which states that a manual fire alarm system that initiates the occupant notification signal utilizing an emergency voice/alarm communication system shall be installed in Group E occupancies.  Day Care facilities fall under a Group E occupancy. In addition, Section 18 of the 2013 edition of NFPA 72 states that effective January 1st, 2014, audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal.

As defined by NFPA 101, an Assembly Occupancy is an occupancy used for a gathering of 50 or more persons for deliberation, worship, entertainment, eating, drinking, amusement, awaiting transportation, or similar uses. A common example of an assembly occupancy is a place of worship where the area of congregation will require voice evacuation. The EVS-INT50W is perfect for this application because vital wall space is saved while providing a 50 watt single speaker circuit amplifier that meets required decibel output and audibility requirements

K – 12 Educational Facilities offer the ability to use the internal amplifier with the flexibility of integrating distributed amplifiers. As with the Day Care Center application, K through 12 educational facilities fall under a Group E occupancy. Since many classrooms and other gathering locations will have an occupant load of greater than 30 people, these facilities are prime candidates for voice evacuation and emergency communications. The 5820XL-EVS and the EVS-INT50W will cover an area or areas of the facility while distributed amplifiers will cover other areas of the facility. This is quickly becoming a popular method of distributing voice.

evs-int50w-diagram2Due to recent code updates and state/local legislation, low frequency is becoming common in the lodging industry. Section 18 of the 2013 edition of NFPA 72 states that effective January 1st, 2014, audible appliances provided for the sleeping areas to awaken occupants shall produce a low frequency alarm signal. Full coverage for low frequency voice evacuation can be accomplished by using a combination of the internal amplifiers and the distributed EVS-100W amplifiers. As with the K – 12 Educational Facilities application, the 5820XL-EVS and the EVS-INT50W will cover an area or areas of the lodging facility while the distributed EVS-100W will cover other areas of the facility.

Do you have applications where the EVS-INT50W would be helpful? Please let us know by clicking on the Leave a Reply link above to enter your request.  Click here to download the EVS-INT50W data sheet.


About the Author
Mark Indgjer is a Product Marketing Manager with Silent Knight.  Mark joined Silent Knight in 1988 and is responsible for new product development, product marketing and much more.  Mark is also NICET Level II certified.​

Tech Tip: EVS-INT50W Power Wiring

The EVS-INT50W is an amplifier that offers a single speaker circuit capable of supporting up to 50 watts of power and is compatible with version 15 of the 5820XL-EVS. Although it is similar to the distributed 50, 100, and 125 watt amplifiers, there are subtle differences.

One of the first things you will notice is that the EVS-INT50W does not come with an enclosure. The reason for this — and why it is described as an internal amplifier — is that it mounts in the 5820XL-EVS cabinet. No external cabinet or hardware is required: this provides the benefit of saving valuable wall space as well as installation time and money.

The other difference you will see is that there is no primary AC and battery backup. The EVS-INT50W is powered by the 5820XL-EVS panel. This is where it can get tricky. To power this amplifier, one of the 6 Flexput™ circuits on the 5820XL-EVS will be programmed for Constant Auxiliary Power and run to the power input on the EVS-INT50W. The SBUS connection, which is normally 4 conductors, will be 2 conductors for the A and B data connections. Do not use the SBUS power (- and +) to power the amplifier. The amplifier draws close to 3 amps in full load. SBUS power only supplies up to 1 amp. Be sure to account for the power draw in your 5820XL-EVS battery calculations.


The internal amplifier is an addressable device, so be sure to set the dipswitches on the unit before powering it up. Also ensure that the panel is programmed to look for the address you set on the amplifier. After this, all options are programmable, such as mapping the speaker output for proper activation, 25 or 70.7 Vrms operation, Class A or Class B speaker wiring, and 520 Hz low frequency output.

Have you installed the EVS-INT50W? Please let us know your experience by clicking on the Leave a Reply link above to enter your request. Click here to visit the EVS-INT50W web page.


About the Author
Bill Root is the Technical Support Supervisor for Silent Knight. Bill joined Silent Knight in 1988 and is responsible for managing applications and technical support across the Silent Knight product line. Bill is also NICET Level II certified.

Three Clients That Need Emergency Communication Systems Now

For years, fire safety and home security have been seen as two separate entities. Even home security providers that sell both fire and security systems market them as two separate services packaged together rather than an all-in-one solution. For security integrators that provide equipment to businesses rather than directly to the end user, this dichotomy is even more pronounced. Recently, chatter among industry associates on social media pages has been focused on a common theme: Are there safe and practical ways for security integrators to also sell their clients fire systems?

The answer is yes. Security integrators should absolutely be selling fire systems to their clients in light of the elimination of the gap between security and fire safety engendered by emergency communication systems (ECSs), such as the one from Silent Knight. These ECSs make it easy for security integrators to make the case for adding a fire system to a sale.

With an ECS such as the Silent Knight 5820XL-EVS, users can send voice-recorded emergency messages to a target group for everything from fire events to security breaches to evacuation orders during natural disasters. In fact, ECSs are quickly becoming the standard for safety as three emerging client bases create demand for the level of safety preparedness they provide, as follows:

  • Hospitals: Hospital layouts are often complex and, therefore, difficult to navigate, especially with the possibility of heightened alarm—and even panic—during an emergency. Further complicating emergency incidents are the range of unique situations that exist in a hospital. For instance, consider the case of a patient who has entered the hospital via the ER and is subsequently diagnosed with a contagious disease and needs to be quarantined. An ECS can send an alert, notifying the wing, floor or entire hospital of the transportation of this individual to a sequestered room to avoid spreading germs.


Additionally, in areas of a hospital where fire or security alarms could affect the care of a patient, or cause further medical complications, ECSs can be used to notify nurses and hospital staff through voice communications rather than a low-frequency alarm—allowing hospital staffers to relay the message to their patients in a safe manner. Finally, an ECS gives hospitals the safety net of a backup system in case intercom systems are disabled during an emergency event.


  • Municipalities: As we recently discussed in our blog post on severe summer weather, municipalities are increasingly in need of support such as that encompassed by an ECS. With today’s climate, regardless of season, the risk of severe weather that can threaten lives and personal property is omnipresent. With an ECS, a town can effectively communicate emergency events, evacuation plans and the locations of shelters during the worst of circumstances. Upgrading to an ECS can be the difference between a town protecting its citizens and catastrophe.


  • Real estate developers: As a real estate developer, your goal is to build housing that fits your target audience’s needs. However, regardless of whether you’re building high-end apartments for the mega-rich, like Donald Trump, or affordable housing for the average Joe, safety needs to be top of mind. You help to protect your building tenants from all emergency events when you install an ECS. An ECS can be used to communicate the need for evacuation due to a natural disaster, building security breach, and fire or carbon monoxide leak. Furthermore, having a building wide ECS will help protect tenants who may not be equipping their own apartments with individual fire or security alarms.

When it comes to safety, regardless of the industry in which you’re operating, protection shouldn’t stop at one system or the other. When large populations need to be protected, either in hospitals, towns or apartment complexes, expect the worst (but hope for the best) case scenario. With ECS, there is now an all-in-one solution.

Temporal 4 Notification Solutions

NFPA 720 has designated the Temporal 4 cadence output pattern for notification of carbon monoxide detection (CO) as the industry standard. In most cases, the annunciation of the Temporal 4 output is limited to the affected area and doesn’t require system wide notification. Silent Knight offers multiple solutions for Temporal 4 output: sounder bases, audio outputs and speaker tone.FireCO Temp 4 Detector Image

The B200S and B200S-LF sounder bases which, used in conjunction with the SK-FIRE-CO  detector, can provide the temporal 4 output for CO detection and the Temporal 3 output for fire detection where only localized annunciation is required. In addition, synchronization of the sounder bases for the Temporal 3 and Temporal 4 output can be accomplished through programming on the fire alarm control panel.

In applications where system wide annunciation of a CO alarm is required by the use of horns, Temp 4 Notification Imageyou must use either a 4-wire horn/strobe or horn only devices to achieve the Temporal 4 output. Currently, there are no 2-wire horn/strobes that can provide both the Temporal 4 for a CO alarm and Temporal 3 for fire alarm outputs. It is necessary to have a separate horn circuit that can be programmed to provide the Temporal 4 on CO alarms and Temporal 3 on fire alarms, while using a separate output to drive strobes utilizing the appropriate sync protocol. Again, synchronization of the Temporal 3 and Temporal 4 audio outputs can be programmed for the horns through the fire alarm control panel.

When using the 5820XL-EVS in applications where Temporal 4 is required for the speaker tone, a Temporal 4 or a Temporal 4 with the 520 Hz low frequency tone can be programmed for the speaker output. Synchronization cannot be accomplished through the speaker output.



About the Author
Bill Root is the Technical Support Supervisor for Silent Knight. Bill joined Silent Knight in 1988 and is responsible for managing applications and technical support across the Silent Knight product line. Bill is also NICET Level II certified.

SKST Adds the Internal Amplifier and More!

The Silent Knight Selection Tool (SKST) is a powerful program that allows you to build a system with any of our IntelliKnight addressable panels. This FREE tool provides job information, bill of materials, battery calculations, and datasheets.

SKST Version 1.4 comes with the following updates:

  • Reconciled all data sheet links for all devices. Some links have been updated to correct file SKST Image 2015not found errors, some links have been added to devices that had no links before.
  • Added the EVS-INT50W internal amplifier to the program for use with the 5820XL-EVS.
  • Added the System Sensor Low Frequency Sounders and Sounder/Strobes as well as Low-Frequency bases and accessories to the program.
  • Added the new ISO-6 multiple Isolator module to the program.
  • Added the EVS-100W Amplifier and EVS-100WBU backup amplifier to the program for use with the 5820XL-EVS Control Panel.
  • Added System Sensor WFDN series Waterflow Detectors to the program.

The SKST includes the following time-saving features and functions:

  • Enter and save project information
  • Select and edit parts from the catalog
  • Generate a bill of materials
  • Export your bill of materials to MS Excel and Microsoft Access
  • Determine battery size by creating battery calculations based on your configuration
  • Print groups of data sheets for submittal packages

To download the latest version (1.4) of SKST, please visit our website: http://www.silentknight.com/support/Pages/SKST.aspx

To learn about the SKST and other tools that Silent Knight has to offer, feel free to view our webinar “Add Value Not Cost: Free Services from Silent Knight”.



About the Author
Richard Conner is the Director of Marketing for the SED Channel – Fire-Lite Alarms, Silent Knight, and Honeywell Power. Richard joined Honeywell in 2002 and has over 15 years of experience in the fire alarm industry in Marketing, Engineering, and Product Support positions. Richard is responsible for developing brand strategy and marketing programs for all brands.