Glossary terms for letter 'O'
Obscured GlassGlass through which light can pass but objects are blurred.
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Glass & Glazing Off Peak HeatingBy which water heaters are supplied with energy during off-peak periods.
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Air Conditioning,
Electrical OffsetA distance measured from a survey mark.
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Surveying Oil TrapA sump to capture and prevent oils and greases entering drainage systems.
Outlet (Electrical)The same as power points or general purpose outlets.
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Electrical