[crazy1van]

I doubt customers will react well to their bulbs changing brightness levels on their own.

[bronson]

The incandescents in my kitchen change brightness every time the microwave turn on. I can live with it.

(It's old knob & tube wiring. Electricians claim it's safe)

[taybin]

Knob & tube is notorious for causing fires. I'd get a second opinion on its safety.

http://www.oldhouseweb.com/how-to-advice/knob-and-tube-wirin...

[toast0]

If it's been oked by multiple electricians, it's probably OK. As your article states, properly installed knob and tube is at least as safe as modern wiring.

The major problem is that since knob and tube lost favor and today, demand for electricity within the home has grown considerably, and a lot of knob and tube systems were expanded improperly; this can happen with modern wiring as well. Also, the insulation issue.

[ars]

Knob and tube is safe if enclosed (in a wall, ceiling, etc.). Surprisingly it's actually more safe than new wires!

But if exposed and someone can touch it, then it's dangerous.

[halostatue]

Knob & tube left in place is generally safe. If you want to do anything at all with the electrical system, however, you'll need to upgrade the whole system.

[danielweber]

It's safe.