SPARK GAP
Spark-gap protective element
A spark-gap element provides a documented breakdown path across separated electrodes.
SLD / Schematic
IEC · F
Double spark gap
A spark gap form with two gaps sharing a common electrode, used to protect two conductors against a common earth.
In plain English
What does Double spark gap mean?
The double spark gap places two gaps in one element, typically from each of two line conductors to a common centre electrode that is earthed. It protects a pair of conductors, such as a telecom pair, with a single component so that both lines are diverted together.
A simple example
The symbol does not state breakdown voltages or whether both gaps are matched. If one gap breaks down before the other, a transverse voltage can appear across the protected pair. Check the product data where balanced breakdown matters.
What the drawings help you do
Identify the common electrode connection to earth. Check breakdown matching between the two gaps. A double spark gap protects two conductors to a common electrode; a single spark gap protects one path.
This particular reference
A spark gap form with two gaps sharing a common electrode, used to protect two conductors against a common earth. A double spark gap protects two conductors to a common electrode; a single spark gap protects one path.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: AutoCAD Electrical: Earthing, sources and surge protection · IEC-60617 symbol preview directory
IEC · Spark Gap, Double
Autodesk IEC-60617 Symbol Preview: Miscellaneous; vendor family reference, not certified IEC geometry.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · F
What it represents
The double spark gap places two gaps in one element, typically from each of two line conductors to a common centre electrode that is earthed. It protects a pair of conductors, such as a telecom pair, with a single component so that both lines are diverted together.
The symbol does not state breakdown voltages or whether both gaps are matched. If one gap breaks down before the other, a transverse voltage can appear across the protected pair. Check the product data where balanced breakdown matters.
How to read it
- Identify the common electrode connection to earth.
- Check breakdown matching between the two gaps.
Information to show or reference
- Show both line connections and the common earth.
- State breakdown voltage.
- Keep the earth lead short.
A distinction that matters
A double spark gap protects two conductors to a common electrode; a single spark gap protects one path.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Earthing, sources and surge protection
Public IEC-oriented preview listing the double spark gap form.
IEC-60617 symbol preview directory
Public directory of IEC-oriented symbol families.
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. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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