Do interlinked smoke alamms need to be hard wired

In many jurisdictions, hardwired, interconnected smoke alarms are required for new homes and major renovations.

• Hardwired systems are reliable and are generally considered the preferred method.
• They ensure that all alarms will sound when smoke is detected, even during a power outage (with battery backup).

Hardwired systems require professional installation by a qualified electrician.

If a home does not already have connected smoke alarms, wireless systems offer a convenient alternative.

• Wireless systems are generally easier and less expensive to install because they do not require wiring through walls and ceilings.

• These systems are typically battery powered (usually with long-life batteries) and communicate with each other via radio frequency.

Some wireless systems can also connect with hardwired systems via a "bridge" unit or compatible model.