Electrical Wiring Flashcards
The 3 materials that most aircraft wirings are coated with
- Tin 2. Nickel 3. Silver
Most common insulation material for aircraft wires
Teflon
2 disadvantages of aluminum wiring
- Crystalizes when subjected to high vibration 2. Can only carry 2/3 of the current that the same gauge of copper wire can
What to do when the sistuation calls for a replacement of a copper wire with an aluminum wire
Always to replace a copper wire with an aluminum wire that is 2 wire gauges greater than copper
The standard system for measuring wire gauges
American wire gauge (AWG)
The typical smallest wire gauge used on aircraft
22 gauge wire
3 factors affecting how much current a wire is capable of of carrying
- Cross sectional area 2. Conductive material 3. Length of wire
The system of How the cross sectional area of a wire is expressed in
Circular mill
One circular mil is equal to ______ inches
0.001 inches
The method for finding the cross sectional area of a round conductor in circular mils
Square the diameter Multiply the diameter by itself
The location for where square mills wires are used
Bus bar connections
The 3 factors that need to be considered for when choosing a wire to install
- System voltage 2. Allowable voltage drop 3. Duty cycle
Indentiiciation markings on wires are required to be labeled every ____ to _____ inches along the wire
12-15 inches along the wire
The 2 ways that electrical wires may be installed on aircraft
- Open 2. In a conduit
Rule with in regards to wire bundle installation and main and back up systems
No single bundle should contain wires for both main and back up systems
Once the wires in a bundle are assembled, the knots should be tied every
Knots on wire bundles should be tied every 4 inches
The type of material used to tie knots on wire bundles
Nylon
The two knots and the sequence in which the knots are tied for electrical wire bundles
Close hitch followed by a square knot
Wire bundles should be at least _____ inches away from any control cable
3 inches
What helps prevent wires from being damaged by fluids that leaks into low areas
Installing wires on the side walls or overhead prevents
The standard rule for when installing electrical wires parallel to oxygen lines or fluid lines
Install wires 6 inches above fluid or oxygen lines
Installing electrical wire at a heigh of 6 inches only deals with _____ lines and ______ lines
Oxygen, fluid
Any bundle that passes through a bulkhead should be
Clamped to a bracket
If less that a 1/4 inch clearance exists between the bundle and the bulkhead hole, this must be done
Rubber grommet must be installed when
