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...
As it turns out, our detector malfunctioned, but was essentially at the end of it's life anyway. Most Carbon Monoxide detectors are good for 5-7 years and should be replaced after that time frame. Typically, the units have a tag or date stamp on the back to indicate it's age or expiration date. Expired smoke and CO detectors should be recycled, as some contain radioactive material, and all have electronic circuits.