There are two types of lamp holder, plastic and metal. They may be found as part of a table lamp, or as a part of a pendant light fitting. The method of connection is similar for both pendant type and table lamp, but the metal and plastic types require different considerations.
The first difference to note is that plastic fittings have no earth connection and should therefore only be connected via a two core flex. Metal fittings must always be connected via a flex with an earth wire.
The second consideration is that metal fittings are not suitable in some locations – the most notable of which is bathrooms. Plastic ones may be used in bathrooms, but choose the type with a longer plastic shroud which shields the components better. In practice, metal lampholders are generally only used for certain types of table lamps.
Light Bulb Base and Socket Shape Types
B Bayonet Collar Base
E Edison Screw Light Base
F Single Pin Type Base
G Multiple Pin Type Light Bulb Base
K Cable Connections
P Pre-focused Light Base
R Recessed Contact(s) Base
S Shell-type Light Bulb Base
T Telephone Slide Base
W Wedge Base
X Special Type Lightbulb Base
Lamp Number of Pin or Contacts
s Single Pin
d Double or Bi-Pin Base Type
t Triple Pin Base or Tri-Pin Base or 3 Pin Base
q Quadruple Pin Base or 4 Pin Base
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