Cable sheath voltage-limiter interface

What it represents

Identifies the selected sheath overvoltage-limiter connection within its bonding arrangement. Earthing and lightning interfaces identify the connections between equipment metalwork, primary protection devices and the station earthing network. Their electrical purpose differs from their physical conductor route or electrode geometry.

In a switchyard arrangement, the earthing references help connect each primary equipment structure and surge-protection device to the correct earth-grid interface. Separate details show actual joints, sizes and installation routes. For this reference, the drawing identifies “Cable sheath and earth” at the input and “Sheath surge-limiting path” at the output. Limiter selection depends on the sheath bonding design.

Name every connected item and the earthing design reference. The illustrative connection does not establish touch or step voltages, conductor sizing, lightning coverage or safe working conditions. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.

How to read it

• Start at the named input: Cable sheath and earth. Identify its source device or document and the state represented on the drawing.
• Follow the named output: Sheath surge-limiting path. Cross-reference its destination and separate the command from confirmation that the equipment responded.
• Limiter selection depends on the sheath bonding design.
• Name every connected item and the earthing design reference. The illustrative connection does not establish touch or step voltages, conductor sizing, lightning coverage or safe working conditions.

Information to show or reference

• Label the source and connection reference for cable sheath and earth.
• Identify the destination and defined state of sheath surge-limiting path.
• Record the equipment or control-document revision supporting this functional block.
• Check this application limit in the project design: Limiter selection depends on the sheath bonding design.

Sources you can follow

These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.

About this graphic

This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.

SVG and DXF downloads contain this original artwork. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.