Glossary Category:

HACR

(used with A/C) A resistance type circuit breaker that has characteristics usable with air conditioning system compressor circuits.

Hand-held spirit level

A flat bar like tool that has a curved alcohol filled tube mounted in it so that a bubble left in the tube centers between two lines when the bar is placed on a level surface.

Hermetically sealed

A component that is sealed from the atmosphere with no shafts or other devices penetrating the membrane that is sealed within

Hydite blocks

A light weight cement concrete block used for partitions within buildings.

Illuminate

To light a room or surface for improved visibility.