Question:
Still waiting to hear how splicing an electrical cord onto a hardwired smoke detector and then securing it into the receptacle with a bracket-is so damn DANGEROUS! (other than it is a violation of some code that no one seems to be able to document)

Answer: Buy some property _anywhere_ in the USA, pull the permits, build a house, wire it yourself and leave out the (NFPA 72 required) 120v/with battery backup, _hardwired_, and interconnected smoke alarms. Then call for a CO. I will guarantee you that you or anyone else will _never_ legally live in that house until the 120v/with battery backup, _hardwired_ and interconnected smoke alarms are installed in the correct locations in that house. Same usually applies for existing houses that are totally rewired/remodeled. Many areas (in accordance with NFPA 72) will allow battery-only smoke detectors in _existing_ homes. In those cases where a battery only smoke detector is permitted, yes, a plug-in 120v/with battery backup smoke detector would be an improvement. HOWEVER, NFPA 72 makes it clear that these are STOP GAP measures at best, and the best solution is to install _hardwired_ , interconnected, 120v/with battery backup smoke detectors. Call your local Fire Marshall for the straight dope. The smoke detector that I referred to in the last thread on this topic, http://www.marilynelectronics.net/products/smoke-detectors/7109LS.htm, as others pointed out, is intended for use by hearing impaired people, in ADDITION to a hardwired system, or, as permitted by NFPA 72 _and_ your local fire authorities where battery only smoke detectors are permitted (EXISTING houses). At $200 bux a pop, I'm sure that you won't have any problem finding an electrical contractor who will install a 120v/with battery backup, hardwired, interconnected system for the same price per smoke. The NFPA72 battery-only smoke detector clause is intended to ease the transition from houses that originally never had smoke detectors to the now required hardwired smoke detectors. The point many others were trying to make in the other thread was that you will _never_ buy a _new_ house in the USA that doesn't have hardwired, 120v/with battery backup smoke detectors in the proper locations. Some AHJ's/lending institutions/insurance companies, will require that existing houses be brought up to fire code before transfer of ownership can occur. Bottom line is this. Should someone decide to do as you propose, it is strongly recommended that one check with their local Fire Marshall and their insurance company _first_. If your intention is to disallow battery-only smoke detectors in favor of plug-in 120v/with battery backup smokes, that may be a step in the right direction. However, IMO, DIY, homeowner jerry-rigged smokes is not the way to go, and even if they were store bought, UL listed, and NFPA 72 approved, as soon as some little kid (or an irresponsible adult) unplugs one, you're right back to square one with the battery-only smoke, which you so adamantly oppose.