What kind of box do you use for a smoke detector?

As far as smoke detectors are concerned the only factors to take into consideration are access to the box for mounting purposes and wire fill. Just as the other answers have said an “old work” box or “cut-in” box work well for this application as it doesn’t require any attachment to a structural member of any kind.

How do you install hardwired smoke detectors?


  1. Mark Locations for the Smoke Detector Boxes. Find the best locations for the smoke detectors. …
  2. Make Cutouts. …
  3. Run NM Cable to the First Box. …
  4. Run Cables to Other Boxes. …
  5. Insert Cables into Electrical Boxes. …
  6. Mount the Boxes. …
  7. Install Mounting Plates. …
  8. Connect the Smoke Detectors.

How are hardwired smoke detectors wired?

A hardwired smoke detector is actually a smoke alarm system that’s interconnected to a 120-volt circuit. Whereas standard smoke detectors run solely off battery power, hardwired smoke detectors are wired directly into your home’s electrical system.

Do smoke alarms have to be mains wired?

Mains-wired smoke alarms are also required in certain types of alteration and extension work. Mount them in the circulation space at every floor level: In loft conversions. When adding new habitable rooms (bedrooms, kitchens, living or dining rooms) above ground floor level.

Do smoke detectors need an electrical box?

To prepare the wiring for an alarm in a new location, you need to install a remodeling box. A remodeling box is an electrical box that can be installed into drywall. This is one of the first steps to learn how to wire a smoke detector.

Do smoke alarms need junction box?

BRK hardwired Smoke Alarms are designed to be mounted on any standard wiring junction box to a 4-inch (10 cm) size, on either the ceiling or wall. Read “Recommended Locations For Smoke Alarms” and “Locations to Avoid For Smoke Alarms” before you begin installation.

Can I install a battery smoke detector over electrical box?

Can I Install a Battery-Operated Alarm over a Junction Box? Battery-operated alarms are not designed for junction box installation. Installing battery-operated detectors over electrical junction boxes may cause nuisance alarms.

Can smoke alarms be wired into lighting circuit?

Mains Powered Smoke & Heat Alarms – hard-wired interconnection. All of Aico’s mains powered smoke and heat alarms again require a permanent 230V AC mains supply which can be taken from a local lighting circuit or a dedicated circuit at the distribution board.

What circuit are hardwired smoke detectors on?

Residential smoke alarms should be wired on a dedicated circuit. It’s a good idea to have at least one light or receptacle-on the same circuit, to alert the homeowners in case the circuit breaker ever trips. Interconnected alarms are usually wired in a daisy chain, using 14-3 or 12-3 cable.

Do interconnected smoke alarms need to be hardwired?

Hard-wired or battery operated? Fire and Rescue NSW recommends wherever possible, hard-wired and interconnected smoke alarms are installed. If your alarms cannot be hard-wired, FRNSW recommends smoke alarms that rely on 10-year lithium batteries.

Do smoke alarm have to be mains powered for building regulations?

All dwellings should be provided with an alarm system to at least Grade D, Category LD3. Position optical or multi-sensor mains powered alarms with an integral backup power supply within the escape routes of the property (i.e. hallways and landings) Have at least one smoke alarm on every storey.

What is the NEC code for smoke detectors?

For many years NFPA 72, National Fire Alarm and Signaling Code, has required as a minimum that smoke alarms be installed inside every sleep room (even for existing homes) in addition to requiring them outside each sleeping area and on every level of the home. (Additional smoke alarms are required for larger homes.)

Where should smoke alarms be placed?

We recommend installing long-life photoelectric type smoke alarms in every bedroom, living area, and hallway – on every level in the house. However this is not always practical. We suggest at an absolute minimum that a long-life photoelectric type smoke alarm should be installed in the hallway closest to the bedrooms.

Can you put fire alarms on the wall?

Fit smoke alarms on a ceiling (or high up on a wall, if the instructions state it is suitable for wall mounting). Make sure you fit an appropriate alarm in every room where there’s a fire risk. Follow the instructions that come with the alarm when it comes to installation– they all work in different ways.

How high should smoke detectors be mounted?

Make sure smoke detectors are installed high on the walls or near the center of the ceilings, and at least 10 feet away from cooking appliances. When installing on the wall, place the smoke alarm within 12 inches from the ceiling. This is because smoke rises and will make the alarms the most effective.

How far do smoke alarms need to be away from the wall?

300mm away

Smoke alarms should ideally be installed in the centre of the ceiling. It is recommended to position the alarm at least 300mm away from walls and light fittings/decorative objects (See fig 1.).

Should smoke detectors be on wall or ceiling?

Smoke alarms should be mounted in or near bedrooms and living areas, either on the ceiling or the wall. Ceiling mounting it is typically preferred as it allows the smoke alarm to be placed more centrally in the room.