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What is the advantage of using screw type bulb holder over pin type bulb holder?
Wiki User
∙ 13y ago
There are no real advantages with using a screw (Edison) base lamp over a pin (bayonet) base lamp.
There is, however, a major disadvantage with using screw-base lamps. It's very important, with screw-base lamps, that the line (live, hot) conductor is connected to the centre terminal of the lamp holder. If not, the outer screw base of the lamp will remain live as it is being unscrewed, and this represents a shock hazard.
Even if the lamp holder is correctly installed (wired), there is still the possibility that the circuit may be incorrectly wired at (in the case of table lamps, for example) the plug or, in the case of North American table lamps fitted with two-pin plugs, the plug may be inserted into the receptacle the wrong way around (although this is less likely, these days, as the line and neutral pin sizes are different).
The above scenario is impossible with bayonet lamp fittings, as the pin terminals are insulated from the metal base of the lamp. Furthermore, a bayonet lamp can never be partially-screwed into the holder, causing a high-resistance connection.
So, in general, bayonet lamps represent a better and safer design.
Wiki User
∙ 13y ago
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