Whatsit for?

[Chillylulu]

Here is one with the missing bolt - generic internet pic:



Other side is a washer and nut on the threaded end.

Chilly

[Bill Houghton]

So, is the part at the top, fitted into the hole and slot in the body, an alternate "foot" for the screw?  That's what it resembles.

[Chillylulu]

So, is the part at the top, fitted into the hole and slot in the body, an alternate "foot" for the screw?  That's what it resembles.

My swag is that a lead is bolted to the other side and this tab holds back when tightening the nut? My only guess is the end is different from a carriage bolt or that ilk is to keep a user from attaching a common bolt..?..

Here is a different view:



Chilly

[Aunt Phil]

First, it's bronze not brass.

Second 2 parts are missing, the tap bolt & the shoe that rides the end of the screw.

The tap wire of whatever length necessary is secured to the clamp and transformer or another clamp in the case of jumpers. 
After that you keep yer damn hands off the device unless you have 2 feet on the ground.

Hotstick goes in the hole of the clamp body to swing the clamp into place hanging on a primary.  Stick is pulled from that hole and indexed into the loop of the screw and the screw is tightened.  Connection is made and stays made for years.

These were very common in the time of 4160 volt primary when a 3 foot wood stick was considered safe.  They are still used but stick technology has changed considerably.

Billman the clamp you pictured is a bus bar tap.  With the screwdriver handle it is most likely to be used on one end of a set of personal safety grounds to provide protection in a switching cabinet. 

[rusty]

>when a 3 foot wood stick was considered safe

-flashback-

Varnished wood workbench

12KVDC laser power supply

Things standing up on the benchtop all by themselves

Things moving around on the bench all by themselves

Little blue lightning balls crawling around on the bench

Power switch behind the bench...

-panic-

-run like hell-

Find circuit breaker in electric panel for workshop.....

Go have a coffee....

[Aunt Phil]

You forgot the part about holding your gloved left hand in front of your face in case the beach flashed.

There is no sound similar to a 1 1/2 amp fuse blowing on 4160 especially when you're the man on the end of the stick closing the fuseholder.

[rusty]

When I was young the substation near my house popped one day.
The crew showed up and tried to close main breaker on the highlines into apparently a dead short. The sky lit up bright green for several seconds.

Like broad daylight. I was 2 miles away..

I always wondered if the poor schmuck who closed the breaker had to go home and change...