Instructions

Operating Instructions
Busch-Dimmer
®
Reduction of the connection
load (derating)
Operating Instructions | 1473-1-7914
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6 Reduction of the connection load (derating)
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The dimmer heats up during operation because part of the connected load is lost and converted into heat. The
specified rated power is designed for dimmer installation in a solid masonry wall.
When installing the dimmer in a wall made of gas concrete, wood, or plasterboard, the maximum connection load
must be reduced by 20%.
The connected load must always be reduced when several dimmers are installed one below the other or when
other heat sources cause additional heating. In intensely heated-up rooms, the maximum connected load must be
reduced according to the diagram.
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Fig. 1: Derating
Unit
Meaning
%
Nominal power
°C
Ambient temperature
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