BOND PE
Protective equipotential bonding
Protective equipotential bonding connects documented conductive parts as part of the protective arrangement.
SLD / Schematic
Symbols · BS
Flexible bonding strap
A flexible braid or strap bonding a movable or vibrating metal part, such as a panel door, to the earthing system.
In plain English
What does Flexible bonding strap mean?
A bonding strap connects metal parts that cannot be bonded with rigid conductors, such as hinged doors carrying equipment, gland plates, cable tray across expansion joints and equipment on anti-vibration mounts. Braided straps also provide low impedance at high frequency, which helps with EMC bonding in drive panels.
A simple example
The symbol does not state cross-sectional area or length, both of which affect protective and high-frequency performance. A long thin strap may satisfy continuity tests but give poor EMC performance. Painted surfaces under strap lugs must be cleaned for a reliable connection.
What the drawings help you do
Check strap size against the protective conductor rule. Look for EMC bonding requirements in drive panels. A bonding strap is a flexible protective or EMC bond; a flexible conductor is a circuit conductor that must flex in service.
This particular reference
A flexible braid or strap bonding a movable or vibrating metal part, such as a panel door, to the earthing system. A bonding strap is a flexible protective or EMC bond; a flexible conductor is a circuit conductor that must flex in service.
- Terminal
- An identified point where a conductor connects.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Earthing connections · AutoCAD Electrical: Earthing, sources and surge protection
Schematic / GA · BS
What it represents
A bonding strap connects metal parts that cannot be bonded with rigid conductors, such as hinged doors carrying equipment, gland plates, cable tray across expansion joints and equipment on anti-vibration mounts. Braided straps also provide low impedance at high frequency, which helps with EMC bonding in drive panels.
The symbol does not state cross-sectional area or length, both of which affect protective and high-frequency performance. A long thin strap may satisfy continuity tests but give poor EMC performance. Painted surfaces under strap lugs must be cleaned for a reliable connection.
How to read it
- Check strap size against the protective conductor rule.
- Look for EMC bonding requirements in drive panels.
Information to show or reference
- State strap cross-section and length.
- Show both bonding points.
- Specify paint removal at lugs.
A distinction that matters
A bonding strap is a flexible protective or EMC bond; a flexible conductor is a circuit conductor that must flex in service.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Earthing connections
Public installation-guide earthing and equipotential connection elements.
AutoCAD Electrical: Earthing, sources and surge protection
Public IEC-oriented bonding forms.
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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