Aluminium Cable

Aviation Electrical Wire

Aircraft service imposes significant environmental circumstances on electrical wire. To guarantee satisfactory service, examine the wire at standard intervals for abrasions, defective insulation, condition of terminal posts, and buildup of corrosion below or around swaged terminals. When changing copper wire with aluminium wire, enhance the gauge of the wire two sizes.

Voltage Drop in Electrical Wire.

The voltage drop in the principal energy wires from the era supply or the battery to the bus ought to not exceed 2 % of the regulated voltage, when the generator is carrying rated existing or the battery is being discharged at the five-moment rate.

Resistance.

The resistance of the latest return path by way of the aircraft framework is often thought to be negligible. However, this is centered on the assumption that sufficient bonding of the framework or a special electrical current return path has been supplied which is capable of carrying the necessary electrical latest with a negligible voltage drop. A resistance measurement of.005 ohms from floor level of the generator or battery to ground terminal of any electrical unit may be thought to be satisfactory. One more satisfactory technique of pinpointing circuit resistance is to examine the voltage drop throughout the circuit. If the voltage drop does not exceed the restrict established by the aircraft or product or service manufacturer, the resistance worth for the circuit may be regarded as satisfactory. When employing the voltage drop strategy of checking a circuit, maintain the input voltage at a continuous price.
It really should be noted that the No. 14 wire really should not be utilised if any portion of its 100-foot length is to be confined in conduit, large bundles, or locations of high ambient temperature.

Aircraft electrical wire or aircraft quality wire.

Proper wire choice is dependent on expertise of present demands, operating temperatures, and environmental situations concerned in the distinct installation. Copper conductors are coated to avert oxidation and to facilitate soldering. Tinned copper wire or aluminium wire is usually used in installations where operating temperatures do not exceed 221* F. (105* C.). Silvercoated copper wire is used wherever temperatures do not exceed 392* F. (200* Nickel-coated copper wire is employed for temperatures up to 500* F. (260* C.). Nickel-coated wire is more difficult to solder than tinned or silver-coated wire, but with suitable techniques, satisfactory connections can be made.

Electrical cable Insulation.

Polyvinylchloride (PVC) is a common insulation, utilised as PVC cable sleeving competing with Vidaflex cable sleeving and PTFE sleeving. It has great insulating properties and is self-extinguishing right after the flame resource is eliminated. Standard working temperatures are limited to 221* F. (105* C.). Silicone rubber is rated at 392* F. (200* C.), is highly adaptable, and self-extinguishing except in vertical runs. PTFE sleeving Fluorocarbon (polytetra-fluoroethylene) is extensively used as substantial-temperature insulation. It will not burn, but will vaporize when exposed to flame. It is resistant to most fluids. FEP cable Fluorocarbon (fluorinated ethylene propolene) is rated at 392° F. (200° C.) but will melt at greater temperatures. Other properties of FEP are similar to TFE.

Thermal and Abrasion Resistant Resources.

Glass braid has great thermal and abrasion characteristics but moisture absorption is substantial. Asbestos and other minerals provide high temperature and flame resistance, but are highly absorbent. Moisture absorption is diminished by use of silicone rubber, TFE, or other saturants. Nylon is extensively used in very low-temperature wires for abrasion and fluid resistance. Polyimide, a new material, has superb thermal and abrasion resistant qualities.

Electrical wire assortment.

Select wire for structural and environmental characteristics. Wire normally employed for chassis wiring, in enclosed regions, or in compact wire harnesses safeguarded by moulded or braided coverings usually has low abrasion resistance. Wire utilized to interconnect units, or in lengthy, open runs as airframe wire, is developed to withstand regular aircraft environment with out sleeving, jacketing, or other protection. Care must be used in generating all installations because no wire insulation or jacketing will withstand steady scuffing or abrasion.

In order to choose the right dimensions of electric wire for gear, two key requirements should be met:

(one) The measurement need to be ample to avert an extreme voltage drop whilst carrying the needed existing more than the necessary distance.

(two) The measurement should be enough to avoid overheating of the wire even though carrying the required latest.

For the variety of wire we should know:

(one) the duration in ft of the real wire "run" from the bus to the tools

(two) the range of amperes of existing it must carry

(three) the sum of voltage drop permitted and

(four) whether or not the existing carried will be intermittent (maximum two minutes) or steady, and if steady, whether or not it is a single wire in no cost air, in a conduit, or in a bundle.

Suppose that we desire to set up a fifty-foot duration of

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Electrical Technology Question (driving me crazy)?

An aircraft company has decided to replace the 15mm copper cables to the main aircraft generators onboard its Boeing 747s with aluminium cables that are capable of carrying the same current. There are three (3) cables each for the two (2) inboard generators with a length of 150 feet. There are three (3) cables each for the two (2) outboard generators with a length of 200 feet.

Calculate the present resistance of each of the inboard and outboard cables and the dimensions of the replacement cables

(Do i not need more info than Length and diameter)?

15 mm^2 copper cable is about the size of a #6 AWG cable (17.16 mm^2). This is 0.404 ohms per 1000 feet at 20 degree C.

The 150 foot cables will have 150 /1000 * 0.404 or 0.0606 ohms each.

The 200 foot cables will have 200/1000 * 0.348 or 0.0808ohms each

A size #4 AWG aluminum cable will have the about the same resistance of the #6 AWG copper wire. The equivalent metric wire size of a #4 AWG wire is 27.27 mm^2 with a resistance 0.416 ohms per 1000 feet.
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This isn't a precise calculation, but it is enough to indicate the size of the aluminum wire required.

Edit
If you truly need the precise calculations, send me an email, and when I have time, I'll calculate it for you.

TexMav

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