Electrical Definitions. Sealable Equipment. Equipment enclosed in a case or cabinet that is provided with a means of sealing or locking so that live parts cannot be made accessible without opening the enclosure. The equipment may or may not be operable without opening the enclosure.
How long does a Carbon Monoxide Alarm last? First Alert alarms are warranted for 5 years, then it should be replaced with a new CO Alarm. SensorPack Modules and batteries should be replaced as needed for those alarms requiring them. Source(s): http://www.firstalert.com/CarbonMonoxide...
The answer is that carbon monoxide detectors do indeed have a limited life. Inside many detectors is an electro-chemical cell that reacts in the presence of carbon monoxide. It tends to be very accurate. But, over time, the chemical can degrade and its performance is diminished.