Home>Discussions>ELECTRICAL & LIGHTING>Should I replace all BX cable?
12 posts / 0 new
Last post
John freeman
Re: Should I replace all BX cable?

I'm jumping in a little late but am concerned about one of your posts.

Just because your tester says you have a ground doesn't mean you have a good ground. If you don't have the little bonding wire, a tiny silver colored wire with no insulation, running alongside your two wires then you have a potentially dangerous situation. Given the apparent age of your wire it is a good bet you don't have a bonding strip meaning you don't have a safe ground.

Should you have a short to your metal jacket you could end up with a fire.

What happens is as the short travels back to the panel it will arc from spiral to spiral throwing out red hot metal along the way. I have seen this happen and it is major fireworks. Further without a good ground you may not throw the breaker meaning the fireworks continue indefinitely. I have seen this happen.

The little bonding strip gives the short a safe path from spiral to spiral avoiding the fireworks.

AC is not the greatest cable around although it works okay. Some locales don't allow it insisting only MC be used.

I recommend you replace all the BX.


TV Listings

Find TV listings for This Old House and Ask This Old House in your area.