# Current transformer with primary conductor indication

Canonical URL: https://eloragrid.ai/symbols/current-transformer-with-primary-conductor-indication
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: CT PRI
Drawing use: SLD, Schematic
Reference families: IEC, Manufacturer

This CT representation explicitly identifies the primary conductor passing through the measurement location.

## What it represents

This CT representation explicitly identifies the primary conductor passing through the measurement location. It helps readers distinguish the power path from the instrument-transformer secondary connections.

## How to read it

- Preserve the primary direction and polarity reference where directional protection uses the measurement.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.

## Information to show or reference

- Mark primary conductor
- Cross-reference secondary polarity
- Identify connected meter or relay

## Important distinction

A conductor passing through a CT window is not an electrically connected secondary winding.

## Facts

- Drawing role: Current measurement
- Representation scope: Functional concept; not an official standard graphic or a product footprint
- Public vendor block reference: HXF1T33, VXF1T33 (Autodesk identifiers; not IEC symbol numbers)
- Identifier status: The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name.

## Public references

- [Current transformer symbol variants](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-40AAEF4A-AC3F-4B3D-90A5-A9E0707C1241.htm) — Autodesk. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
- [Indoor current and voltage transformers](https://www.abb.com/gb/en/areas/electrification/medium-voltage/grid-components/core-components/indoor-instrument-transformers) — ABB. Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.

## Graphic scope

Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.