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...
Methods used to measure the amount of carbon monoxide in a given volume include electrochemical alarms and solid state detectors. Permanently-mounted Electrochemical alarms work by converting the carbon monoxide electrochemically to carbon dioxide. This conversion generates an electrical current that is taken as a measure of the gas concentration and sounds the alarm on the device when it reaches a certain predetermined level.