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Test equipment|Non-metals|Fire tests|Pipe tees|Bushes (mechanical components)|Electrical insulating materials|Dimensions|Electric conduits|Screwed fittings|Spacers|Locknuts|Impact testing|Marking|Testing conditions|Pipe fittings|Locking and locating devices|Thermal resistance|Elbows (pipes)|Pipe couplings|Thermal testing|Solid electrical insulating materials|Design|Dielectric-strength tests|Bend couplings