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Do you live in a home or commercial building that was built in the 1900’s to the early 1950’s?

If so, then your building is almost sure to have what is called “knob and tube” wiring or an ungrounded system. Here are the top 5 dangers of knob and tube wiring.

The newer systems provide retrofit moldings that fit the new components’ holes where your old system is installed.

How To Determine How Many Wires Are In Your Old Nu Tone System: Before you can order an intercom replacement, you need to determine how many wires are used in your existing intercom system.

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But my father-in-law says there's nothing wrong with leaving it alone. CTA When installed correctly knob and tube wiring was, in some ways, superior to current wiring practices.

There are several new intercom systems that offer retrofit options, meaning you can still use the wiring you already have in your walls, no matter if your previous intercom was installed using 3, 4, 6, or even 8 wires.

Also, although the new systems are smaller than the old, you will not have to cut any more holes in the drywall.

Fairly common in houses built before 1930, the system uses porcelain insulators (knobs) for running wires through unobstructed spaces.

Porcelain tubes protect wires that run through studs and joists.