It is a fixture that has a hermetical seal that keeps fumes and vapours from the electrical parts of the fixture. A good example of a vapour tight fixture is one that is used in paint spray booths. These types of fixtures are not to be confused with explosion proof fixtures which are in a different category altogether.
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A fixture or device that holds a light in place by means of some sort of socket, that is connected to a power source.
A pin based fluorescent light fixture is the type of fixture that takes fluorescent tubes. On each end of the fluorescent tubes there are contact pins. These pins are used to hold the tube in the fixture and to supply the voltage to the tube from the fixture's ballast.
The wire nuts do not have to be inside the junction box. They must, however, be as tight as possible to keep moisture from inside the light fixture.
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Extra wires to a light fixture are dangerous. It can cause electrical shock when having contact to people therefore it must be guarded to avoid physical contact.