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Technical
information
Wiring accessories
Dimmer switches
General Information:
When specifying dimmers it is advisable to obtain as much information as possible to ensure suitability and compatibility of products.
Consider the following:
Q
Type of lamps/lighting
Q
Type of control gear used in the light fittings, (if applicable) e.g. type. make and model number of transformer or ballast, etc
Q
Number of light fittings/load of each dimmer
Q
Number of circuits/dimmers
Q
Number of dimmers on each plate
Q
Number of switching positions for each circuit
Q
Any requirement for dimming lights from more than one position
1 gang plate size
Dimmer
modules
Max.each
dimmer
Min.each
dimmer
Total per
plate
1
250W
60W
250W
1
400W
60W
400W
1 (Electronic)
300VA
60VA
350VA
2
250W
60W
500W
2 (Electronic)
200VA
60VA
400VA
Maximum load of 400W for the plate should not be exceeded.
2 gang plate size
Dimmer
modules
Max.each
dimmer
Min.each
dimmer
Total per
plate
1
1000W
100W
1000W
3
250W
60W
750W
4
250W
60W
1000W
Maximum load of 1000W for the plate should not be exceeded.
GET mains dimmers are NOT designed for dimming with any form of Low Voltage transformer. For this application a suitably rated Low
Voltage Dimmer Switch should be used.
GET dimmer guidelines
Moulded plate mounted dimmers can generally be used with the supplied pattress to replace standard wall switches (where a 16mm box
depth is typically used). For flat plate mounted dimmers, 25mm boxes are required, except for the 1000W Electronic dimmer that requires
a 47mm box. All rotary dimmer terminations and wiring are the same as for standard switches, i.e. COM, L2 (and also L1 for two-way
dimmers).
Rotary one-way dimmers can only be used for switching and dimming from one position. Rotary two-way (push) dimmers can be used to
replace any one, (but not both), of the two-way switch circuit, (note that only one dimmer can be used per switch circuit or lamp(s); thus the
lights can be switched from more than one position but can only be dimmed from one. With any rotary dimmer, if replacing an existing switch
or dimmer, make a careful note of which wires are installed in which terminals on the old unit, and then connect them into the terminals with
corresponding markings on the new dimmer. To ensure that plate temperatures are within maximum limits, maximum total connected load for
a single size plate is 630W, and for a double size plate is 1000W. For Low Voltage lighting, remember to allow for transformer losses when
calculating the total circuit load, typically 15% - 20%.
To use electronic dimmers in 1, 2 or more way circuits the circuit diagrams below and the Important Notes MUST be followed exactly.
Maximum permitted loads in Watts for multiple dimmers in a single enclosure
Front plate gang size
2
3
4
6
8
9
12
18
24
Per row (max rating W)
400
480
480
480
480
480
480
480
480
Total plate
(max rating W)
400
480
480
740
740
940
940
1440
1800