1000 wiring fundementals part 1b - mitrecaasd.org · wire bend radii 4minimum bend radius - 10...
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![Page 1: 1000 Wiring Fundementals Part 1b - mitrecaasd.org · Wire Bend Radii 4Minimum bend radius - 10 times the outside diameter of the largest wire or cable in the group — unsupported](https://reader033.vdocuments.mx/reader033/viewer/2022042215/5ebb5d322fb8035f217f2283/html5/thumbnails/1.jpg)
NBAA Conference 2003 1
Correct
Correct Incorrect
Incorrect
90±5°
Clamp Orientation
90±5°
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NBAA Conference 2003 2
Example - Clamp Distortion
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NBAA Conference 2003 3
release tab
support bracket
tail
snap-in tie mount
Plastic Snap-in Clamp (Tie Mount)
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NBAA Conference 2003 4Stand off
No pinching
Clamp tabs
Rubber cushion
Wedge
Typical Rubber Clamp
All wires contained in rubber cushion
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NBAA Conference 2003 5
Engage Clamp Tab in Slot
Incorrect
Clamp slot
Clamp tab
Correct
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NBAA Conference 2003 6
Clamping
A
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NBAA Conference 2003 7
Clamping
B
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NBAA Conference 2003 8
Wire Bend Radii
Minimum bend radius - 10 times the outside diameter of the largest wire or cable in the group — unsupported
ExceptionsTerminations/reversing direction in bundle (supported at both ends of loop) -3 times the diameterRF cables - 6 times the diameterThermocouple wire - 20 times the diameter
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NBAA Conference 2003 9
No support at end of bend
Min. bend radius - 10 x parameter of wire or cable
Support at both ends of wire bend
Diameter of wire or cable
Min. bend radius 3 x diameter of wire
Minimum Bend Radii
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NBAA Conference 2003 10
Bend radii okay-Greater than 3 times diameter (secured at both ends of loop)
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NBAA Conference 2003 11
Bend radii problem-Less than 3 times the diameter
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NBAA Conference 2003 12
Unused Wires
SecuredTied into a bundle or secured to a permanent structure
Individually cut with strands even with insulation
Pre-insulated, closed-end connector or 1-inch piece of insulating tubing folded and tied back
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NBAA Conference 2003 13
Tying tapeWire bundle
Spare Connector Contact: Single Contact Attachment to Wire Bundle
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NBAA Conference 2003 14
Unused wiring * Improper termination with exposed conductor.* Should be properly capped (insulated) and secured to bundle.
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NBAA Conference 2003 15
Wire bundle
ties
Coil and stow short wire bundles in low vibration areas
Clamp
Coil and Stow Methods
Wire bundle
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NBAA Conference 2003 16
Coil and Stow Methods, cont.
Wire bundle
Wire bundle ties
Coil and stow long wire bundles in low vibration areas
Clamp
Excess wire
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NBAA Conference 2003 17
Coil and stow in medium and high vibration areas
Adjacent wire bundle
Wire bundle Wire
bundle ties
Teflon tape
Coil and Stow Methods, cont.
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NBAA Conference 2003 18
Stowing Unused Wires
A
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NBAA Conference 2003 19
Wire Replacement
Wires should be replaced when:Chafed or frayedInsulation suspected of being penetratedOuter insulation is crackingDamaged by or known to have been exposed to electrolyte, oil, hydraulic fluid, etc.Evidence of overheating can be seen
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NBAA Conference 2003 20
Wire Replacement, cont.
Wire should be replaced when:Wire bears evidence of being crushed or kinkedShield on shielded wire if frayed and/or corrodedWire shows evidence of breaks, cracks, dirt, or moisture in plastic sleevingSections of wire have splices occurring at less than 10-ft intervals
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NBAA Conference 2003 21
Wire Replacement, cont.
Shielding requirementsReplacement wires must have the same shielding characteristics as the original wire, such as shield optical coverage and resistance per unit length
Replacement wires should not be installed outside the bundle shield
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NBAA Conference 2003 22
Correct procedure
Incorrect procedure
Chafing
Adding or Replacing Wires on a Bundle
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NBAA Conference 2003 23
AC 43.13-1b Topic Outline, cont.
Electrical load determinationBreaker and wire sizing/selectionRouting/clamping/bend radii
Splicing
Wire terminalsGrounding and bondingWire markingConnectors and conduitsWire insulation properties
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NBAA Conference 2003 24
Wire Splicing
Keep to a minimum
Avoid in high vibration areas
Locate to permit inspection
Stagger in bundles to minimize increase in bundle size
Use self-insulated splice connector, if possible
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NBAA Conference 2003 25
Staggered Splices
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NBAA Conference 2003 26
Overheated wire at the splice
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NBAA Conference 2003 27
Ganged wire
splices (diodes)
with proper strain relief
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NBAA Conference 2003 28
Ganged wire splices with pre-load condition
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NBAA Conference 2003 29
AC 43.13-1b Topic Outline, cont.
Electrical load determinationBreaker and wire sizing/selectionRouting/clamping/bend radiiSplicing
Wire terminals
Grounding and bondingWire markingConnectors and conduitsWire insulation properties
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NBAA Conference 2003 30
Terminals
Tensile strength of the wire-to-terminal joint should be at least the equivalent tensile strength of the wire
Resistance of the wire-to-terminal joint should be negligible relative to the normal resistance of the wire
WF#