ABB REL 551 2.3 Series - Page 31

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Mounting the terminal &KDSWHU
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See the Technical reference manual for measurements.
Depending on the wall different preparations may be needed, like
drilling and inserting plastic or expander plugs (concrete/plaster-
board walls) or threading (metal sheet wall).
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It is much easier to do this without the unit in place.
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It is much easier to do this without the unit in place.
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See figure 5.