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...
It is normal for smoke alarms to go off and sound briefly (up to 5-10 seconds) when you install a new battery or when they are powered up. If the alarm continues to go off and no smoke is present, the cause may be one of the following: 1  There may be insufficient battery power, try new batteries.hen you are testing your smoke alarm, there are a number of reasons why the alarm might not sound: 1  You may not be holding the test button down long enough. 2  Try holding it down for up to 10 seconds (20 seconds on photoelectric models) . 3  Your battery may not be installed properly or snapped all the way in place.