Open Wiring On Insulator vs K&T?

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Seven-Delta-FortyOne

Seven-Delta-FortyOne

Goin’ Down In Flames........
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Humboldt
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EC and GC
Can’t really understand the difference between the two.

Any one care to enlighten me?

Thanks.


Worthelss verbiage added to get to 100 characters. 🙄
 
What are you calling an insulator? And what are you calling open wiring?

Knobs and tubes or the fastening and protection mechanisms for what could be considerd open wiring, so called "knob and tube" supported by porcelain "knob" insulators, and running through framing members through porcelain "tubes"
 
Not a lot of difference really.

As far as whether 394 or 398 applies look carefully at title of section.

394 - Concealed knob and tube wiring

398 - Open wiring on insulators

Think you could have exact same conductor type in some instances but whether it is open or concealed determines which section applies.
 
In the early days of automotive plants they used open racks of round bars on porcelain insulators to run 3 phase power across the plants. The precursor to enclosed busways. The main run was about 500' across the building.

I was in a plant in the mid 90's that still had it energized and working. Lower maintenance than the line shafts that preceded it.
 
James L said:
What are you calling an insulator? And what are you calling open wiring?

Knobs and tubes or the fastening and protection mechanisms for what could be considerd open wiring, so called "knob and tube" supported by porcelain "knob" insulators, and running through framing members through porcelain "tubes"
Click to expand...

Dont know.

I was just reading the Code articles on it, and realized I didn’t know the difference.
 
Again open vs concealed in the section titles I think is a big factor on which applies. Same individual conductor from what I can tell can possibly even transition from open to concealed.
 
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