Date of an Insulator

[der5997]

You folks have proved very helpful in the past with my Museum Research questions, and I'm back with another.

I'm currently researching and cataloguing this screw type multi-skirt power line pole insulator. (Please correct my terminology, BTW, as I'm making up my own terms out of ignorance of the correct ones.)

Could you please tell me the Voltage Range for an insulator such as this (My guess = 30-40KV) and the date (I know the screw base was discontinued, but don't know the time-frame.)

Many thanks for consideration.

[Marc]

I have no idea of the age but unless they were installed in stacks, it would likely handle no more than 2,400 volts line to ground, probably less.

Marc

[der5997]

Thanks Mark: Not stacked, as there is a thread in the center for fixing to a power pole. I based my guess on voltage on the modern example on the power line outside our home (subdivision developed in the late 1990s) This pic is of one of three identical lines on cross trees on the power pole.

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[Jim Katen]

Sorry I can't be of any help. I though it was a Sake cup.

[Bill Kibbel]

You folks have proved very helpful in the past with my Museum Research questions, and I'm back with another.

We only know about stuff in and on buildings. I've collected a few as a kid riding a dirt bike along old RR right-of-ways.

There are serious collectors of telegraph, phone and power line insulators. I've talked with some fanatics that mentioned there are published guides and even collectors' clubs.

[Bill Kibbel]

You might start here: www.insulators.info

I see that the 41st annual Pennsylvania Insulator Show and Sale is coming up nearby. I probably won't make it - the event is probably more excitement than I can handle.

[der5997]

Thank you very much people! Bill Kibbel I'll follow up on that site you gave - I've got it bookmarked - and see if the folks there are able to shed more light.

Have a great weekend everyone.

[kurt]

The 41st...Pennsylvania.....Insulator Show........and Sale.

Not the 3rd or 17th. They've been doing this since 1973.

I'm betting there's a lot of beards.

[Gardner]

I have no idea of the age but unless they were installed in stacks, it would likely handle no more than 2,400 volts line to ground, probably less.

Marc

Those in particular can go to at least 8kv phase to ground, possibly 15kv phase to ground if designed so. Smaller pin types usually only go to 5kv phase to ground.

I frequently call those bowl insulators. They aren't meant to stack, rather they go unto a metal threaded pin often found on cross arms. A wire or rubber "tie down" is used to hold the wire in place.