Jump to content

Mains wired detectors


Recommended Posts

Assuming that pressing the button on most detectors is a battery test. How are mains wired detectors tested?

To clarify what Harry said.

Pressing the button on a detector is NOT a battery test.

When the test button is pressed the detection device (be that ionisation / optical / other) is "fooled" into believing "contamination" is present, so the detector sounds for a short while. The battery voltage is monitored by different electronics of the detector, and if in the testing process the battery voltage becomes too low the sounder will chirp at regular intervals to indicate this.

It is the same for mains / battery / combination detectors.

Link to comment
Share on other sites

  • 3 months later...
Guest stuart

We have mains wired detectors that beeped once this morning at 5.30. They did a similar thing about 2 months ago, but no sound inbetween (other than us pressing the test button on each unit). Any suggestions why this happened?

Link to comment
Share on other sites

  • 8 months later...
Guest MadelaineBa

My local building control officer has specified the installation of a mains operated smoke detector in the living area of my home. Is it a legal/insurance/building requirement for this to be installed by a qualified electrician? Can it be installed by a competent person who's not qualified?

Link to comment
Share on other sites

It appears you are involved in building regulations and you could be subject to the Smoke Detectors Act 1991 or it could be a compensatory requirement, this is why the building control officer has specified the installation of a mains operated smoke detectors. Because you are involved in Building Regulations in England and Wales, Approved Document: Part P applies which requires domestic electrical installations to be designed and installed safely according to the "fundamental principles" given in British Standard BS 7671 Chapter 13. This means you need a professional electrician to install them and certify them for the BCO to grant a completion certificate.

Link to comment
Share on other sites

Following on from what Tom says, I should like to point out that although ideally an electrician should install the smoke alarms, not all electricians are Part P registered. So although any electrician can install them, not all electricians can issue a certificate that says the work complies with Part P.

Link to comment
Share on other sites

Join the conversation

You are posting as a guest. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...