The voltage ratings of terminal blocks are based upon the minimum spacing between electrically conductive parts line-to-line through air and over surface and line-to-ground through air and over surface.
Class A - Service, including deadfront switchboards, panel boards and service entrance devices.
Class B - Commercial appliances including business equipment and electronic data processing equipment.
Class C - Industrial, general
Designed for electrical termination of wire where flexibility of circuit design is necessary. Accept single or multiple wire sizes for tubular screw and tubular clamp styles.
|Spacing Requirements (in inches)|
|Voltage||Through Air||Over Surface|