UL Requirements for Wire to PCB Connection

[jas3600]

Are there any UL requirements regarding wire attachment to PCBs?
Is it permissible to directly solder a wire to a PCB?
If so, what kind of strain relief is required?

 

[DRWeig]

Can you post a sketch of what you're trying to accomplish?

Best to you,

Goober Dave

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[jas3600]

Here is a drawing. The wire is 18 gauge stranded.

Any guidance is greatly appreciated.

Thank you.

 

[mcgyvr]

Unless the specific standard your device is being designed to calls for something specific there is no requirement to do anything but solder it directly to a PCB (as shown in your image #1).
No strain relief is required by UL at all..

We have hundreds of UL listed products where we simply solder anything from 24 to 14 AWG directly to the board without any relief at all. Never had a problem.
Now depending on the environment/vibration,etc.. that your specific product might see in its lifespan it would probably be a good idea to do something like #2 or other but its not required generically.

 

[DRWeig]

Agree with mcgyvr. We also have many soldered leads to PCB on listed products, whenever the ability to disconnect is not needed.

The need for strain relief is your call - what sort of forces will the leads be subjected to, etc...

Best to you,

Goober Dave

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[jas3600]

Great feedback!

Thank you mcgyvr and DRWeig...

 

[zappedagain]

IPC-A-610 defines a lot of requirements for what is acceptable and is not acceptable when soldering a wire to a PCB.

Z