Jump to content
Electronics-Lab.com Community

Choosing the right equipment wire?

Guest Zeppelin

Recommended Posts

Guest Zeppelin

How do we determine the right gauge for equipment (interconnect) wires?
Do we need to derate here too?

I have a PSU with 3A continuous & 5A maximum current rating. I was actually planning to use a 10A wire (to be on the safe side) but it proved to be too bulky for the job :( possible overkill  ;D

Link to comment
Share on other sites

Hi Zeppelin,
Over-rating the size of wires for equipment interconnect is not overkill when it provides a nice low voltage loss.
You don't want to set the regulated supply to 5V and have fluctuating 2V to 5V at the equipment, do you? Good regulated supplies for external equipment use "remote voltage sense" wires in addition to the main wires to the equipment. Then the voltage regulation occurs at the equipment where the wires join.

Link to comment
Share on other sites

  • 4 weeks later...

The "ampacity" of wire is based on temperature rise. Different types of insulation on the same wire AWG will have different ampacities. It really comes down to how much drop can you tolerate. If you need to be "legal" in the regulatory agencies eyes, there are "tables" that specify allowed levels.

As a point of reference, the "fusing current" of 30AWG (bare, solid wire) is 10A.

Link to comment
Share on other sites

  Thats a great question,  Where can one find a table of the FUSING currents of common wire sizes.

I have always got a big kick out of running 6ga wire to a circuit, only to see the interconnect wires inside the unit shrink down to 16 or 18ga.  I like to keep handy tables around, and I have never seen that one anywhere.


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...