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DC & AC types standard supply voltages covered by 3 varieties
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3 wired polarised or 2 wire bi-polar DC second stage control on all types.
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3-wire AC second stage control on YO5, YL5 and YO3 types
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Complies with BS 5839-1 : 1980 Clause 9.5
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Choice of lens colour (except YO3)
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32 sound signals
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2 Stage Alarms
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Radial stackers.
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