Induced-current earthing-switch duty reference

What it represents

Identifies an earthing application with its separately specified induced-current switching duty. Disconnector and earthing references identify different mechanical constructions and connection duties within a yard. The primary diagram shows which conductors are joined or earthed; the equipment drawing explains how its contacts and supports move.

In a switchyard bay, a bus selector can use a different physical construction from a line disconnector. Each device still needs an identified operating mechanism, position indication and interlocking interface. For this reference, the drawing identifies “Induced circuit condition” at the input and “Specified earthing switching role” at the output. The duty requires an explicitly rated device.

The construction name does not establish load-breaking capability, short-circuit making duty or operating permission. Verify these properties in the selected equipment data and the station interlocking scheme. 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: Induced circuit condition. Identify its source device or document and the state represented on the drawing.
• Follow the named output: Specified earthing switching role. Cross-reference its destination and separate the command from confirmation that the equipment responded.
• The duty requires an explicitly rated device.
• The construction name does not establish load-breaking capability, short-circuit making duty or operating permission. Verify these properties in the selected equipment data and the station interlocking scheme.

Information to show or reference

• Label the source and connection reference for induced circuit condition.
• Identify the destination and defined state of specified earthing switching role.
• Record the equipment or control-document revision supporting this functional block.
• Check this application limit in the project design: The duty requires an explicitly rated device.

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.