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Multi-conductor terminal block
A multi-conductor terminal provides several connection points for its documented electrical path.
Schematic
IEC · X
Power distribution block
A terminal assembly that splits one incoming conductor into several outgoing conductors on a common bar.
In plain English
What does Power distribution block mean?
A power distribution block takes one large incoming conductor and distributes it to several smaller outgoing conductors on a shared conducting bar, saving space compared with stacking lugs on one terminal. It is used in control panels to distribute supply to several circuit breakers or loads.
A simple example
The symbol shows the shared node and terminal count but not the short-circuit current rating, which varies widely between products and must suit the available fault current. Outgoing conductors connected to a distribution block usually need upstream protection sized for the smallest outgoing conductor unless tap rules allow otherwise.
What the drawings help you do
Check the block's short-circuit current rating against the panel rating. Confirm outgoing conductor protection. A power distribution block is one node with many terminals; a multi-conductor terminal block is a single terminal accepting several wires.
This particular reference
A terminal assembly that splits one incoming conductor into several outgoing conductors on a common bar. A power distribution block is one node with many terminals; a multi-conductor terminal block is a single terminal accepting several wires.
- Terminal
- An identified point where a conductor connects.
- 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: IEC-60617 Symbol Preview: Power Distribution Blocks · Terminal block functional families
IEC · Power distribution block, 3 terminal
Autodesk IEC-60617 Symbol Preview: Power Distribution Blocks; 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 / GA · X
What it represents
A power distribution block takes one large incoming conductor and distributes it to several smaller outgoing conductors on a shared conducting bar, saving space compared with stacking lugs on one terminal. It is used in control panels to distribute supply to several circuit breakers or loads.
The symbol shows the shared node and terminal count but not the short-circuit current rating, which varies widely between products and must suit the available fault current. Outgoing conductors connected to a distribution block usually need upstream protection sized for the smallest outgoing conductor unless tap rules allow otherwise.
How to read it
- Check the block's short-circuit current rating against the panel rating.
- Confirm outgoing conductor protection.
Information to show or reference
- State block current and short-circuit rating.
- Number incoming and outgoing terminals.
- Confirm conductor protection downstream.
A distinction that matters
A power distribution block is one node with many terminals; a multi-conductor terminal block is a single terminal accepting several wires.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
IEC-60617 Symbol Preview: Power Distribution Blocks
Public IEC-oriented preview page listing power distribution block forms.
Terminal block functional families
Manufacturer terminal block functional 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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