Electrical Cables And Connectors Flashcards
Single wire
Used in aircraft
Wire is only used to support the electrical current to the load and then back through the aluminium structure to the generator or battery
Wire
An insulated single copper conductor surrounded by insulation.
Copper conductor wire
gives Maximum wire flexibility
Are tinned which protects the wire from corrosion
Aluminium conductors wire
takes a Large load
saves weight
Electrical cables lnsulation properties
can with stand Voltage resistance up to 600 Resistance against aircraft fluids Flexible Strong Light weight
Temature range insulation
Up to 100/150 degrees normal
Up to 250 degrees high temp
Up to 400 degrees fire resistance
At 1093 the degrees the insulation starts to break down after 5 minutes
Stranded copper wire
Conductor most common type of wire used
Aluminium cable conductors
Are Used for large loads like galleys and have some limitations of use
wires with larger an size 8 AWG are
Not for use in engines
Not for use on engines
Not for used in high vibrations
Shielded wire
Are used in systems to protect from any outside erratic or magnetic interference
Shielded at one side , creates a loop
Operating below 50 khz needs to be grounded at one end to prevent current back flow
Coaxial cable
Used to transport high frequency
Temp range -40 to 84
Best achieved when bolt sides are grounded
Identification code
Part number and system wire ID code are different
Part number from manfautre does not reflect circuit functionality
Only authorised cables
System wire ID printed on cable my company
Part number have on
Wire type Manufacturers County Year Wire size
Breaking down part number
Class begins with C C3
Wire size at the end
Type T4
Wire identification
The circuit belongs to Size Any other information relating to the wiring diagram Shielded or not Company puts on after manufacture
Wire marking machine
Mechanical printing with heat ans colour foil
Ink jet - printer
C02 laser
Uv laser
Cable
2 or more wires
Wired ID
Wire bundle number System code Wire number Size Colour code In that order
Wire marking
Each end within 3 inches on end
System letter
2 letter system
First the system
2nd sub system
Used to identify the system by a wire
ATA chapter 100
Uses numbers instead of letters
System wire ID special
Sone wires cant be marked without damaging insulation
Insulation tubing will be printed before then installed on the wire
Shield wire
Thermo couple
Multi conductor wire
High temperature wire
Current carrying capacity
Current capacity of a wire is dependant on the size and temp
If the temp decreases the maximum possible current in on wire will increase
Currebt carrying capacity
If the temp decreases the maximum possible current in on wire will increase
Aromatic polyamide AP
wire insulation Save weight and space Saves 50 wight and 30 space Smouldering at 815 Prone to Carbon arc tracking wet an dry causes it to blow up
Dry tracking
Causes by a short circuit
Build of of carbon desposet
Causes a full power arc destroying the entire bundle
Wet tracking
Aircaft fluid only
Thermo couples
Egt exhaust gas themp
Dissimilar metals
To prevent confusion the thermo couple cable should never be red / blue insulation covering
Shouts be white/ green and white/red and red/yellow
Repaire alumel wires with alumel splices only
Use same metal n
Fire warning wires
Red or white.
Electoral connectors
Used to facilitate maintenance when frequent disconnect is required
Contacts are pins
Plug houses the pins and receptacle housing sockets
The live side has pins to stop people touching it
Live side the receptacle
Connector categories
Split shell
Assembled connector
Split shell
Come disacempled
Glass K made from steel Is fire proof
Class A-D made of aluminium
Identification by AN number
Assemble connector
Most Common type
Consist of one part
Only the backing clamp is separate and has a different part number to the connector
So both parts are ordered separate
Connector insulation
Master key way , main grove ,
The master key way should be at the top
Contact arrangement / configuration
Goes anti clock wise
Every 10th contact is bracketed or dotted or circled
Environmental sealing
Contact is inserted and locked
Sealing across the mating faces or the plug and receptacle
Sealed when a wire or seal plug installed
Optimum environment seal is achieved when all 3 positions are sealed
Seal plunged
Unused holes filled with nylon or Teflon in an unpresired ares
In conjunction with seal plugs
Polarisation key
Prevent the wrong computer being installed into a shelf.
Three posts , different shapes , must match so computer can be installed
Can be rotated in 6 positions
Coaxial connectors types
Soldered coaxial connectors
Crimped connectors
Connector locking
Connector is wire locked to keep in place in high vibrations
Wire lock plug to scocked
Can only wire locking stuff less than 15 cm away
If receptacle has no holes for wire locking the connector can be wire locked to structure
