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...
Carbon monoxide alarms are a little different than smoke alarms. When a smoke alarm starts beeping, you can usually see the smoke that's causing it. When a carbon monoxide alarm starts beeping, there's nothing to see. So it's important to call 911 for a beeping carbon monoxide alarm -- just not a chirping one.