Knob and tube wiring consists of two wires that are hold in place with ceramic knobs and tubes. As the knobs clamp the wire to the structural member, the tubes prevent fire from chafing.
This system isn’t dangerous per say, but it’s rather old and the insulation wears out in time. Many wires are concealed behind walls, insulation or ceiling and it’s quite a challenge to evaluate their state.
The wires are also connected as they are soldered together and wrapped in electrical tape and it’s only a matter of time until the tape wears out or simply falls off.
You would typically find the knob and tube wiring in older installations, consisting of 60-amp service and it doesn’t have a ground conductor. You do need a ground conductor when you’re plugging in appliances that come with three-prong plug. This way the risk for reverse polarization is minimal.
The knob and tube wiring doesn’t take more than 60 amps and the insulation may be worn out. It’s not a grounded system which is quite risky for some modern wiring. It’s safe to use it though in rooms with lower risk (living room, dining room, bedroom) and you should never use it in areas where you may have contact with water (kitchen, bathroom).
When using this method, you should never replace a blown fuse with a larger amp fuse. You don’t want to cut the grounding prong off a plug so that it fits into a two0hole receptacle.
Knob and tube wiring isn’t dangerous per say, but it’s problematic when you use it too much. It’s better to get the system evaluated by a licensed electrician from time to time. Better yet, you should upgrade to the modern wiring systems.
Many houses in the United States come with two hot wires and one neutral coming into them, whereas the supply is 240/120 volts. The actual voltages is a bit lower, around 230/115 volts. This is what we call the single phased power.
The alternating current is the power coming into your home and this type of current lets the electricity be transported over long distances.
House wiring may be dangerous and you do need to read and apply some electrical safety tips. Never work on your house wiring with the power on and use lock out tag out procedures so that no circuits are turned on during your working.
Get a non-contact voltage tester and check the box first. It may be that more than one circuit runs though the same box. Even though you may have turned one of them off, it’s possible that more hot wires still remain in the box. Play it safe and always double check.
The “Main Service Panel” contains the circuit breakers of fuses for the electrical power in your home and you want to turn it off during a flood or other risky situations. The panel should present labels for various items (washer, dryer) so you know for what each circuit breaker is assigned to.
Don’t forget about the circuit breakers as they trip the amount of current if it exceeds a certain level. The new circuit breakers may also identify shock hazards and arcing conditions.
Choose wisely the electrical wires, as it’s wise to use the right size wire for some electrical devices.
House wiring isn’t difficult, but you do need to keep in mind that it may be dangerous which is why it’s essential to follow the safety rules at all time.