Advertisements

eBay High Voltage Alligator Clip Test Leads

The Description sounds enticing, in the usual eBay manner:

100% Brand new and high quality.
Product Shape: Same as the picture show
1. Product Name: High Voltage Alligator Clip Test Leads
2. Cable Type: Double-Ended Wire
3. Conductor Material& Size: 1mm²Copper Wires
4. Housing Material: Silicone
5. Max. Current: 15A
6. Withstanding Voltage: 2KV
7. Operating Temperature: -20℃~120℃
8. Making Way: Injection Molding
9. Interface Type: AC/DC
10. Color: Black, Yellow, Red, Green, Blue

Suit For:
1. Injection molding to complete, good looking, moisture proof, durable and tough!
2. Electrical test leads suitable for use with multimeters, power supplies and other electronic equipment

They’re three bucks each, which should buy you some copper and decent construction.

The insulation over the clips is certainly chunky enough, even if one might quibble about the standoff distance required for a 2 kV rating:

eBay HV Alligator Clips - overview

eBay HV Alligator Clips – overview

The wires have good silicone insulation and consist of fine copper strands, but I definitely won’t trust them to handle 2 kV:

eBay HV Alligator Clips - wiring

eBay HV Alligator Clips – wiring

No solder, of course, just  copper conductors bent back around the insulation and crimped into the alligator clip. Definitely not a gas-tight metal-to-metal joint, but good enough for simple needs.

Update: A better look at the crimp on a different clip:

eBay HV Alligator Clips - crimp

eBay HV Alligator Clips – crimp

IMO, the clip’s low-strength metal can’t possibly make and hold a gas-tight joint, no matter how hard you squeeze.

There’s enough contact area for low resistance, on the order of a few tens of milliohms. We’ll see how long this lasts …

Advertisements
  1. #1 by Mick King on 2018-08-20 - 09:33

    are you going to solder them?

    • #2 by Ed on 2018-08-20 - 14:46

      I’m going to wait for the crimp to lose its mojo before pulling them apart and rebuilding the entire connection. With a bit more luck than I deserve, that’ll take forever …

  2. #3 by Jason Doege on 2018-08-20 - 12:28

    Methinks that crimp could benefit from more of a crush.

    • #4 by Ed on 2018-08-20 - 14:48

      No matter what, it’s still a spongy silicone spring holding the wires in place against the alligator clip, so it’s not a “solid connection”.

      Silicone is surely better than PVC, though. [sigh]

      • #5 by Jason Doege on 2018-08-21 - 08:03

        I meant the metal (wire) to metal (clip) contact area. That looks a little loose for my taste.

        • #6 by Ed on 2018-08-21 - 12:01

          I added a better view of the crimp to the post. Obviously, the front section was a bystander during the crimping operation.

          But, under the (possibly unreasonable) assumption there’s more than a few millimeters of wire bent back under the insulation, then it’s probably Good Enough.

  3. #7 by Vedran on 2018-08-20 - 13:02

    I was (self) tought that you shouldn’t solder crimped connections, because it induces a stress point and supposedly solder can flow over time and weaken the crimp?!?

    First I’m pretty sure is true but obviously not gonna matter with that much stress relief. Any truth to the second reason?

    • #8 by Ed on 2018-08-20 - 14:51

      I’ve screwed up other joints by not providing enough strain relief, but those insulating boots certainly put most of the stress far enough from the end of the clip that a solder joint should work OK.

      I think a firmly crimped connection should have a solid copper-to-copper structure, so the solder ought to just fill in the holes. Sounds plausible, which makes it a dangerous assumption …

    • #9 by Jason Doege on 2018-08-22 - 13:24

      Notionally that’s why there are two crimped sections. The larger one should capture the insulated part of the wire and form some strain relief and the second smaller part should be crimped tight with only metal to metal contact. It would do no harm to solder this portion but, crimped properly, soldering should be unnecessary.

Spam comments vanish. Comment moderation may cause a delay.

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s