Noise filtering ( as installed on computers as well as many modern appliances ) may help keep external noise out of X10 signals, but noise filters not designed for X10 may also attenuate X10 signals traveling on the branch circuit to which the appliance is connected.
32.
In addition to Ground Fault Circuit Interrupters ( GFCIs ), Arc-fault circuit interrupter devices ( AFCI ) are equally important as they offer added protection from potentially hazardous arc-faults resulting from damage in branch circuit wiring as well as extensions to branches such as appliances and cord sets.
33.
A common design of fuse box that was featured on homes built from 1940 to 1965 was the 60-amp fuse box that featured four plug fuses ( i . e . Edison base ) for branch circuits and one or more fuse blocks containing cartridge fuses for purposes such as major appliance circuits.
34.
At the customer's premises, the wires usually enter the building through a weatherhead that protects against entry of rain and snow, and drop down though fuse or circuit breaker, which controls all of the electric current entering the building at once, and a number of smaller fuses / breakers, which protect individual branch circuits.
35.
In the late 1960s problems and failures related to branch circuit connections for the newer building wire made with the utility grade AA-1350 alloy aluminum began to surface, resulting in a re-evaluation of the use of that alloy for building wire and an identification of the need for newer alloys to produce aluminum building wire.
36.
No technology located in a circuit breaker or fuse panel could detect a high-resistance wiring fault as no measurable characteristic exists that differentiates a glow fault from normal branch circuit operation . "'Power Fault Circuit Interrupters "'( "'PFCI "') located in receptacles are designed to prevent fires caused by glowing connections in wiring or panels.
37.
Also, larger aluminum building wire made with the newer AA-8000 series alloy of aluminum is commonly used for electrical services ( e . g . service entrance conductors from the utility connection to the service breaker panel ) and for larger branch circuits with higher loads such as those for sub-panels, ranges and air-conditioning units.
38.
A unit that requires 230 V AC with a tolerance of 5 % will not require a buck boost transformer if the branch circuit ( under load ) is between 219 V AC and 241 V AC . Measurement should be made while the circuit is loaded, as the voltage can drop several volts compared to the open measurement.
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