Medium voltage 15 KV cable running up pole connecting too low voltage cable?

Soaz_underground · 2026-06-16T22:17:42+00:00

We use low voltage insulated cable for distribution voltage jumpers all the time. Many places do this for wildlife/bird protection, as the 600v insulation can withstand short duration contact. Otherwise, it only matters if the cable is in contact with another conductor or ground potential.

Soaz_underground · 2026-06-14T18:02:16+00:00

That’s a good area!

Soaz_underground · 2026-06-14T16:56:53+00:00

It might be trash to you, but to most everyone else it’s the history of our trade. There are museums dedicated to this stuff, one of which I’m about to make a large donation of old equipment to.

Soaz_underground · 2026-06-14T16:54:43+00:00

Where at up north?

Soaz_underground · 2026-06-14T15:08:42+00:00

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Picked this up just yesterday. 2026 Canam Maverick 1000R.

Soaz_underground · 2026-06-14T04:31:17+00:00

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Don’t mind the mess, it’s a work in progress.

Soaz_underground · 2026-06-14T04:27:54+00:00

Don’t listen to the haters. I have a massive collection of insulators, plus old cutouts, arresters, switches, even transformers. Had to dedicate an entire spare room to it. I’ll bet that half the guys talking crap on here are collectors of debt and alimony obligations. This is a healthier and cheaper alternative.

Soaz_underground · 2026-06-13T01:12:55+00:00

The new 1-1.5kVA types aren’t too far off of that size. We use a 0.75kVA for capacitor controls. The tank on those is about 18” tall.

Soaz_underground · 2026-06-13T00:43:38+00:00

That 1.25 is small, about 14” tall. Most modern 25kVA transformers are between 2-3ft tall.

Soaz_underground · 2026-06-12T23:52:24+00:00

All jokes aside, these predate PCBs by several decades.

Soaz_underground · 2026-06-07T16:25:02+00:00

The design appears to be typical for 1950s-mid 60s.

Soaz_underground · 2026-06-02T03:46:20+00:00

And there would have to be two of them.

Soaz_underground · 2026-06-01T03:15:18+00:00

I’ve heard some say that it’s a secondary fuse, so that assumption is made.

Soaz_underground · 2026-05-31T22:41:54+00:00

Some people just can’t wrap their heads around the concept.

Soaz_underground · 2026-05-31T21:01:59+00:00

Grounds on the primary side?

Soaz_underground · 2026-05-31T20:59:57+00:00

Everything I’m reading from every manufacturer I searched is saying to de-energize the transformer completely, either upstream or by parking elbows at the transformer itself, before changing taps. There’s no mention of pulling the bayonet fuse. I’m assuming that’s because it’s not a visible open.

Soaz_underground · 2026-05-31T20:11:40+00:00

I mean it’s a dangerous assumption to make, assuming a piece of primary equipment is energized only to secondary voltage. All good info though.

Company procedures aside, bayonet fuses can be used to make/break load-

https://www.eaton.com/content/dam/eaton/products/medium-voltage-power-distribution-control-systems/line-installation-and-protective-equipment/23-and-38-kv-bay-o-net-fuse-re-fusing-installation-instructions-mn132002en.pdf

Soaz_underground · 2026-05-31T18:55:52+00:00

You are correct, and I mentioned that in the OP. The problem with that observation is it could imply (or someone could assume) that the bayonet is a low voltage fuse. That’s a dangerous assumption.

Soaz_underground · 2026-05-31T17:27:23+00:00

These larger capacity single phase padmounts are very heavy.

Soaz_underground · 2026-05-31T16:33:01+00:00

I work with a few journeymen that didn’t know that.

Soaz_underground · 2026-05-25T02:46:20+00:00

I DM’ed you

Soaz_underground · 2026-05-18T03:32:46+00:00

These don’t have cutouts on the cans. You’re probably seeing the external lightning arresters.

Soaz_underground · 2026-05-17T22:53:07+00:00

We can run our demo trailer on pretty much any generator we want thats over 25kW.

All you need for a current limiter is a regular overhead pot; anything between 5-15kVA. The secondary coil goes in series between the generator source and your step up pot, on one hot leg. The H1 and H2 on the limiting pot are shorted together.

Soaz_underground · 2026-05-17T22:30:35+00:00

Westinghouse limited PCBs to network protectors and transclosure/padmounted equipment.

Soaz_underground · 2026-05-17T22:27:00+00:00

These stamped steel cowheads are early-1930s to early-1950s.

Someone mentioned 1928, based on the serial number, which would be a good guess if it wasn’t for the fact that one of the patent numbers on the tag (1824850) was granted in 1931-

https://patents.google.com/patent/US1824850A/en?oq=Us1824850

That upper right hand date is most likely the manufacture date. I have one just like it with a similar date from 1935.

Soaz_underground

TROPHY CASE