How to Wire a Smart Switch with No Neutral (2024)

Older homes will not usually have neutral wiring because building codes before the mid-1980s didn’t require it. If that’s your case, you may wonder if you can use smart switches without a neutral wire in your home.

You can set your fears aside because the answer to that question is an emphatic “Yes!” There are three ways to circumvent the problem of not having a neutral wire in your home:

  1. Rewire your home
  2. Purchase smart bulbs
  3. Install a smart switch without neutral

Rewiring your home is the least desirable option because it’s painfully expensive and may not be physically possible without practically tearing apart the major of the wall in your hours.

Purchasing smart bulbs is far less expensive than rewiring, but when the wall switch is turned off, you lose the intelligence of the bulb because it can no longer receive commands. It’s a significant imposition for an entire family to remember to always keep the light switches in the “on” position at all times.

The most effective solution is to install no-neutral smart devices that don’t require a light switch neutral wire, and it’s the solution we recommend.

  • Neutral vs. No-neutral: What’s the Difference?
  • How To Identify a Neutral Wire
  • The EVVR In-Wall Relay Switch
  • How to Install Smart Switch Without Neutral

Neutral vs. No-neutral: What’s the Difference?

What is the role of the neutral wire in your home? The answer lies in how electricity flows through your wiring system. The electrical current must travel in a continuous loop to be used safely. Does that mean that it’s constantly moving? No, only a loop must be present for things to work properly. Turning off a light switch breaks the circuit, stopping electricity in its tracks.

When you turn on a light switch, power flow from its source (either a battery or transformer) to the device being powered, but then the power flows back to the source through the light switch neutral wire to complete the loop.

How to Wire a Smart Switch with No Neutral (1)

What is a Neutral Wire in a Light Switch? A neutral wire is crucial for most smart lighting devices because that’s how the light receives commands. Without the light switch neutral wire, your light is no better than a traditional bulb when the wall switch is in the “off” position. A smart light loses its intelligence when the wall switch is off because the circuit is broken, and there’s no wire to transmit orders to the device.

The neutral wire is always “on,” even when the light switch is “off.” That’s how you can tell the lights to turn themselves on when they’re off because the light is always “listening” for commands through the neutral wire.

How To Identify a Neutral Wire

Although neutral wires aren’t typically carrying a current when a device is off, they should still be handled cautiously to avoid an unpleasant shock that can potentially cause extreme pain or worse. Is The White Wire Hot Or Neutral? How To Determine Which Wire Is Hot And Neutral

There are several ways to establish if your home contains neutral wiring and can easily accommodate intelligent devices, such as:

  • If your home was built after the mid-80s, you’re almost guaranteed to have neutral wiring throughout your home.
  • You most likely have neutral wiring if your light switch is located near an electrical outlet.
  • You probably have a neutral wire if you have multiple light switches in the same switch box.

How to Wire a Smart Switch with No Neutral (2)

The final and most reliable technique for determining if there’s a neutral wire in your light switch box is to remove the wall plate and look. So long as you take the appropriate precautions to ensure the power is off before removing the plate (as discussed below), it’s your best bet for an accurate assessment.

TheEVVR In-Wall Relay Switch

To install the EVVR In-Wall Relay Switch without using a light switch neutral wire, you need theEVVR Smart Relay and a Smart Switch Sub-Assembly. The benefits of this two-device pair are phenomenal:

  • Unit Split Design for Expanded Functionality—When it’s not paired with a Smart Switch, the Smart Relay operates independently as a wireless Zigbee/Z-Wave connected device to your lights. It transforms regular light bulbs into intelligent lights that you can control in several ways.

You can also wire in the optional Smart Switch to connect the Smart Relay with your wall switches to gain expanded functionality for “always on” capability.

  • No Neutral? No Problem!—The In-Wall Relay Switch is a no-neutral wire smart device, bypassing the need to have a neutral wire in your home. This advanced device makes smart technology available to millions of homeowners living in older houses without neutral wiring. Now anyone can reap the benefits of smart lighting cost-effectively by installing smart switches that don't require a neutral wire.
  • Compact Design—The miniaturized product design allows up to two devices to fit into any standard electrical box, allowing you to support up to 4-gang panel switches.
  • Universal Wall Switch Compatibility—The In-Wall Relay Switch is compatible with every type of wall switch, including toggle switches, momentary push buttons, and intelligent remote buttons.
  • Any Bulb Can Be Smart—This switch can turn any incandescent, halogen, fluorescent, or LED bulb into a smart one without converting your entire wiring setup into an intelligent system.
  • Easy-to-Use Voice Control—Control the lights in your home hands-free with simple voice commands through Apple Siri, Amazon Alexa, SmartThings, or Google Assistant.
  • Hardwired 3-Way or 4-Way—There’s no need to change wiring when using the Evvr In-Wall Relay Switch. It supports hardwired 3-Way or 4-Way systems and controls the same light fixture from multiple conventional switch panels. In addition, you can control different light fixtures from a single location.
  • Internal Power Failure Memory—The Evvr In-Wall Relay Switch memorizes the state of the lighting in your home and restores it to that same state after a power outage. For example, if a light was on before the power failure, it will come back on after power returns without you having to do anything.

>> What is no neutral smart switch and when to use it?

TheEVVR In-Wall Relay Switch is the ideal smart switch for your home to upgrade lighting to smart devices because it doesn’t require a neutral wire to work properly. It’s an easy-to-install, reliable device suitable for homes of any age.

Solution Plug and Play without Installation

EVVR has a range of smart home products that provide a complete and comfortable home experience.EVVR Energy Monitoring Smart Plug and Relay HomeKit-enabled, can control your appliances on/off via HomeKit, EVVR App or the built-in button. This smart plug connects both older and newer home gadgets, and gives outdated appliances new and smart life.Plug-in, set up our smart energy monitor with a QR code, then enjoy the simple operation with an on/off switch. You don't need to be familiar with wiring or have any electrical know-how.

Introducing the EVVR Energy Monitoring Smart Plug – currently crowdfunding with an exclusive invitation for you to explore its features.Limited-Time Pre-Sale Alert!Get smart with EVVR Smart Plugup to 35% off discounts!

How to Install Smart Switch Without Neutral

Installing the Evvr In-Wall Relay Switch is quick and easy because it’s a smart switch that doesn't need a neutral wire. The only tools required are a screwdriver, wire strippers, and needle nose pliers.

Again, ensure that the power to the electrical box where you’re installing the smart switch is off before proceeding. Go to your main circuit breaker box and locate the switches where you’re working using the legend inside the box. If the legend is missing, turn off the main breaker to kill the power to your entire house.

Once the power is off, go back to your work site and try to turn on the lights. If they come on, then you’ve flipped the wrong breaker switch. If you flipped the main breaker and your lights still come on, you’ve got big problems, and you should call a professional electrician!

How to Wire a Smart Switch with No Neutral (3)

With the power safely off, remove the face plate for your light switch box. Next, remove the screws that attach your existing switch to the wall. Disconnect the wires to the switch. You should have three wires in your wall, a hot wire, a load wire, and the neutral wire. You won’t need the light switch neutral wire, so leave it curled up inside your wall if it’s there.

Attach the hot wire to the hot wire on the switch. Connect the load wire to the load wire on the switch, giving each a slight twist, and capping both with yellow wire caps, twisting them on securely for a tight fit.

That’s it—you’re done! You now have a smart light switch without a neutral wire.

Conclusion

After transforming your home lighting system into a smart lighting system with theEVVR In-Wall Relay Switch, you will love controlling your lights with your voice or remotely from anywhere in the world where you have internet access.

It doesn’t matter if you have a light switch neutral wire in your home. If you do, it’s no problem, and yourEVVR In-Wall Relay Switch will work. If you don’t, that’s also no problem because theEVVR In-Wall Relay Switch will still work!

The possibilities are endless, and the added convenience and safety of upgrading your home lighting to smart lighting are immeasurable.EVVR can offer you a comprehensive smart home solution whether you are an integrator, professional installer, distributor, or DIYer. Get in touch with us and book a sample product today!

How to Wire a Smart Switch with No Neutral (2024)

FAQs

What if I don't have a neutral wire for my smart switch? ›

What to do if you don't have a neutral?
  • Install neutral wire. You can add neutral wire to your smart switch no neutral, but you need to do re-work inside your walls. ...
  • Use smart bulbs instead. ...
  • Buy a smart switch no neutral wire.

What if my switch does not have neutral wire? ›

Neutral wires are not used with a standard switch, although some electronic dimmers use them. If there is no Neutral wire connected to your switch, one or more will most likely be in the back of the box containing the switch. The Neutral wire may be part of a bundle, and is likely capped with a wire nut.

How to wire a timer switch with no neutral connection? ›

How do you install your timer switch with no neutral wire? The simplest way is to purchase a timer that does not need a neutral wire to operate. This way you will not need to make any changes to the switch, and the timer will work with no neutral wire.

Can I use ground as neutral? ›

Actually, if you connect the grounding wire as a neutral by mistake, most devices will operate correctly. However, such a connection is against code, since each conductor has a different function in an electrical installation.

Can a device work without neutral wire? ›

If Neutral wire cut , device will not work, because there is return path forcurrent flow .

What happens if a neutral wire is missing? ›

In the event of loss of neutral, the single-phase voltage will rise to the three-phase level subjecting your equipment to >400V instead of 230V. This results in over voltage and can be catastrophic for your appliance. Any electronic appliance connected to the wiring will most likely be damaged due to overheating.

What happens if you wire live and neutral wrong? ›

All circuit have their own on/off switch put on the live line. On reversal of Live and Neutral connection the load circuits and connected equipment will remain live irrespective of the concerned switch in On or Off position.

Is a neutral required at a switch? ›

Section 404.2(C) requires a neutral conductor to be installed at specific lighting switch locations. Not all light switches require or even use a neutral but some have electronic circuitry that requires a current return path to complete the circuit even when the device is in the off position.

Do all WIFI switches require a neutral? ›

Not all smart switches need neutral wiring. Some of our favorite brands that don't need neutral wires are Lutron Caseta and GE CYNC. Just be aware that many of the switches that don't need neutral wires will need a smart hub to work. It's a small trade-off.

What if a light fitting has no neutral? ›

If it has no neutral wire, it won't work, unless the electricity is taking an unintended and probably dangerous path. A neutral is a grounded conductor, intended to carry the current of the device. It's the only way a circuit should be working. Some incorrectly connect the fixture to a grounding wire.

What to do if there is no neutral wire? ›

If your switch box doesn't have a neutral wire, you have two options. First, you can have an electrician install one. Our electrician claimed it's not difficult work, but they'll need to get behind your walls.

Can I use ground as neutral for a smart switch? ›

It is not advisable as it can cause grounding issues with other switches and components. It is illegal as Neutral is a current carrying conductor, while code requires ground to be a non-current carrying conductor.

Can I tie the neutral and ground together? ›

Proper grounding is essential for safety and good power quality. Neutral is the return path of the current, and ground wire holds the fault current to trip the breaker in protecting the person and the facility. The neutral and ground should never be bonded together in the facility except for the main panel.

Do you need special wiring for a smart switch? ›

There should be an "in" wire, an "out" wire, and "ground" wire and a "neutral" wire, which is typically white. If you're missing a neutral wire (which is possible if you're living in an old home), you need to buy a specific kind of smart light switch that doesn't require a neutral wire.

Does code require neutral at switch? ›

Switches controlling line-to-neutral lighting loads must have a neutral conductor installed at all switches serving bathroom areas, hallways, stairways, and habitable rooms or occupiable spaces as defined in the building code [Sec. 404.2(C)].

Does a transfer switch require a neutral? ›

If the application does not require a neutral, the answer is YES, it is okay not to use / utilize the neutral conductor provided / available in the transfer switch. ASCO transfer switches will operate and switch between acceptable power sources even without utilizing the provided neutral conductor.

Does Lutron Caseta require neutral wire? ›

NOTE: The PD-5WS-DV switch does not require a neutral connection. If a neutral connection is available in the wallbox, Lutron strongly recommends using the PD-5ANS / PD-6ANS where possible.

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