05:47PM | 06/02/03
Member Since: 06/01/03
5 lifetime posts
I am hooking a ceiling fan up to knob & tube wiring and have some questions. First, the wires were not clamped to the old box, just droped down through the wire holes. Was this done for good reason...perhaps to allow the wires to expand and contract with changes in temperature? Second, should clamping to the replacement box be advisable, is there a certain type of clamp that should be used, or is the type made for sheathed electrical cable ok?


03:41PM | 06/04/03
Member Since: 08/30/02
19 lifetime posts
Sparks, in alot of DIYer projects I would say go for it, but when it comes to K&T it is best left to an electrician. The old wiring method is not necessarily a danger, but never the less, should be handled by a pro.



12:40PM | 06/10/03
Member Since: 06/01/03
5 lifetime posts
I am curious as to why this is not a DIY project since all that is involved from an electrical standpoint is hooking up 2 wires inside a box. I'm not changing anything except swapping one fixture that draws minimal current for another. The only thing I'd like to know is why the wires weren't clamped to the box as is required today. Was there a good reason for it, or had the need for clamps not been recognized when this wiring was put in? Others I have talked to have said their knob and tube wiring is not clamped to the boxes either.


04:26PM | 06/10/03
Member Since: 08/30/02
35 lifetime posts
I can't find a code section that says "open wiring" [read knob & tube conductors] had to be clamped to the box...320-6(a) requires these conductors to be 'supported' [read a knob] within 12" of a connection to a lampholder or receptacle.

These old conductors were secured with a knob within 12" of boxes , as is sheathed electrical cable [secured that is] - but where sheathed electrical cable is required to be clamped to the box I don't know if these old conductors were required to be clamped.

Maybe one of the more code-savvy readers will find a code section for that....however, it may not have been a code requirement back when your wiring was originally installed.

[This message has been edited by dana1028 (edited June 10, 2003).]



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