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ETS-20 and ETS-20-DR Resources

The IOTA ETS-20 Emergency Lighting Control Device combines emergency lighting capabilities with enhanced energy-saving performance. To access complete product specifications, click here!


The IOTA ETS-20 and ETS-20-DR introduce a new level of emergency lighting capability for facilities and public spaces that utilize auxiliary power sources for their emergency egress lighting.

This video is designed to explain the wiring and functionality of the ETS-20, and demonstrate how the unique advantages of the ETS-20 can increase energy efficiency and lower your power costs.

Part 1- ETS-20 Overview

To begin, imagine a normal lighting circuit with an on-off control device, like a wall switch.

Now a common Emergency Lighting solution to use in this situation would be a generator or inverter. Either the generator or inverter would power a separate circuit that would include Emergency Lights, and is controlled by a transfer switch that switches from Normal Power to Generator power during an emergency. This is a great way to ensure there is always power to emergency lights, however, to make sure the emergency lights always come on, they’re required to be “night-lights” or “always-on” fixtures, that are not affected by the wall switch, and over time, will cause increased power consumption. And that means, more costs.

By incorporating the ETS-20 into the lighting circuit, you can restore local switch control to your emergency lighting load, eliminating the need for night lights or always on fixtures, and causing you to see increased energy savings.

Part 2 - ETS-20 Wiring

So how does it work? Well, the best way to understand the ETS-20 is to understand how it's wired, and that begins with the "Normal Power Sense." These include the 18 gauge Black Wire and the 18 gauge White (Neutral) Wire which connect to the Normal Line and the Normal Neutral respectively, making sure the Black wire is connected ahead of the control device. These wires are used to sense whether power is being applied to the normal lighting circuit.

Next, we connect the 18 gauge Red Wire, known as the "Normal Switch Sense," ahead of any control device or wall switch on the Normal Lighting Circuit. This wire works with the 12 gauge Red Wire, known as the "Emergency Output" and is connected to the output of your emergency lighting load. The ETS-20 uses these wires to sense the position of the local control device, and pass that information on to the Emergency Load throug the ETS-20's "Emergency Output." This allows both the normal and emergency lighting loads to benefit from the local control device.

The last two wires we will connect will be the 12 gauge Black Wire and the 18 gauge Grey Wire, forming the auxiliary emergency circuit feed.

Part 3 - ETS-20 Function

We have now successfully wired the ETS-20 into the Normal and Emergency Power Circuits. During Normal Power Conditions, power flows through the ETS-20 to the emergency load, according to the position of the wall switch as sensed by the Red 18 wire. If the switch is turned off, the ETS-20 interrupts the flow of power to the emergency load, turning off the lights. This allows both the normal and emergency load to benefit from the local switch control, giving you complete control of your lights. Complete control means energy efficiency, and the nice cost savings that come from less consumption.

And should a power-loss occur, resulting in a switch from Normal Power to Generator Power, the ETS-20 will sense the drop in power along the Normal Circuit, and re-route power through the Red 12 and Black 12 wires, bypassing any local switching or control devices, and allowing your Emergency Lights to operate at full lighting output.

The ETS-20 also includes an optional Remote Device Jumper that can be connected to a remote device like a Security Panel or Fire Alarm which can be used to tell the ETS-20 to bypass the local switching or control devices for the Emergency Load.

Part 4 - ETS-20 Dimming

And lastly, the ETS-20 can be further configured to allow for dimming applications. This configuration allows you to include dimming controls (instead of a wall switch) that would be applied to both your normal and emergency lighting circuits, to help you achieve energy efficiency. Wiring the ETS-20 for this scenario is only slightly different. The Red 12 Emergency Output, Black 12, and and Emergency Circuit Line are all connected to the Emergency Load, and the Red 18 Normal Switch Sense is capped, since the Emergency Load is controlled by its own dimming control. If emergency power is activated, the ETS-20 will route power around the Emergency control device, and power the Emergency Load at full output.

Part 5 - ETS-20-DR

The applications for the ETS-20 do not end though, as IOTA is proud to announce the latest in Emergency Transfer Switching Technology with the ETS-20-DR.

The ETS-20-DR is designed to work with 0-10 volt dimming controls and provides additional Dimming Relays that allow for Dual Zone Dimming Bypass. The applications for Dual Zone Dimming Bypass are endless, but a great way to imagine it in action is to think of an auditorium where there would be two different zones of lights that would have separate dimming controls. This would let you keep the lights on at full brightness on the stage, while the rest of the auditorium was nice and dark for the attendees. Both of these dimming zones would include normal and emergency lights, however, without the ETS-20-DR, the emergency lights would have to be on a separate circuit, or wired separately from the dimming control to ensure that they aren't dimmed during an emergency situation. By incorporating the ETS-20-DR, however, you can restore the dimming functionality to both zones of lights, and be confident that your emergency lights will come on at full brightness.

Before we move on to wiring, a distinction should be made between “Zone Dimming” and the standard ETS-20’s dimming option. In our auditorium application, you would achieve having two dimming controls with the standard ETS-20’s dimming option, however the second dimming control would only dim the emergency lights. The other dimmer control would control all of the normal lights. With the ETS-20-DR, you can achieve Zone Dimming, which allows two different dimming controls to control two different zones which could include both normal and emergency lights.

Part 6 - ETS-20-DR Wiring

Lets move to wiring the ETS-20-DR. Wiring the ETS-20-DR is almost effectively the same as wiring the Standard ETS-20. With the ETS-20-DR the Red 18 “Normal Switch Sense” serves as a master switch sense for both of the dimming zones, meaning both normal and emergency lights can be controlled by one master switch not pictured on this diagram.

The ETS-20-DR wiring deviates from the standard ETS-20 Wiring with the introduction of the dimming relay leads. The ETS-20-DR interfaces with the pre-existing leads coming from the Dimming control for each dimming Zone independently. The leads from the ETS-20 interface with each dimming zone independently. Starting with Zone 1, the Brown/White (Normally Open) wire interfaces with the Violet leads coming from the Normal Lighting Load and the Zone 1 Dimmer control. Next, the Brown (Common) interfaces with the Violet lead coming from the Zone 1 Emergency Lighting Load. In this application, the Brown/Black (Normally Closed) wire is capped, however, this lead can be connected to another control device (such as an alternate dimmer) to accept a signal other than full output while in Emergency Mode.

During normal power situations, the ETS-20-DR allows the signal from the dimmer control to pass through to the emergency lights. However, once a drop in normal power is detected, the ETS-20-DR will open the connection between its relay leads and interrupt the dimming signal to the emergency lights. Having no signal from the dimmer telling it otherwise, the emergency lights will then operate at full brightness.

After Zone 1 has been wired, you simply duplicate the wiring using the Orange leads for Zone 2, and at this point your ETS-20-DR has been properly wired and installed.

We hope you enjoyed this demonstration, and feel well equipped to tackle your emergency lighting needs with the help of the ETS-20 or ETS-20-DR. As always, if you have any questions you can call IOTA Tech Support at 1-855-363-9527, or you can visit our website at iotaenginnering.com for more technical resources and information about the ETS-20. Thanks for watching this video, and have a nice day.

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IOTA ETS-20 Reference Guide
Read the ETS-20 Reference Guide for informative insight on the function and installation of the ETS-20 and ETS-20-DR.

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