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 one exception is if it you only hear your carbon monoxide detector beeping every minute or two, which could be a low-battery warning signal. In those cases, you should immediately replace the battery, and if there is no battery present, you should call emergency services just to be safe and exit your residence.