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BUY AUTOMOTIVE WIRING PRODUCTS ONLINE
Professional quality auto electrical accessories and
cable terminal supplies direct from
the UK national distributor . Buy automotive electrical
wiring parts and equipment online by mail order for
trade workshop or diy use with vehicle wiring installations on
car, van , caravan, motorhome, catering trailer , HGV , bus, motorcycle ,
construction plant , groundcare machinery , and marine
boat applications.
Large wiring product range includes : Automotive
cable , battery clamps , crimping tools , fuses , fuseholders ,lights , switches , horns ,
dashboard warning lamps , worklamps , exhaust clamps, fasteners, nuts, bolts , washers,
rivets, clips , heatshrink tubing, pvc conduit,
wiring grommets
brake tube, first aid kits, trailer lamps , 12N 12S 24N
24S Plugs, protective clothing,
workshop sundries
Tel 01952 247007 for mobile auto electricians in Telford ,Shropshire. Car van truck auto electrics diagnostics .
www.autoelectrics.net
Breakdown callout service to Telford,Shrewsbury,and Shropshire areas.
Electrical Circuit Theory
Ohms Law States:
The current flowing in a circuit is directly proportional to the voltage applied and inversely proportional to the resistance
at a constant temperature.
Ohms law may be used to calculate the loads applied by components during the design of a circuit:
For example ;
A vehicle is fitted with a work lamp, which is fitted with a 12volt 55watt bulb. The current drawn by the lamp can be
calculated using Ohms law by :
Current (I) = Power in watts (W) divided by Voltage(V).
Current (I) = 55 / 12 = 4.58amps
From this the cable size , fuse, and switch capacity required can be calculated.
Changing the rating of the bulb to 100 watts would have the following effect:
Current (I) = 100/12 = 8.33 amps current draw .
The resistance of the lamp can be calculated by
Resistance(R)=Voltage (V) divided by Current (I)
For the 100watt lamp this would be 1.44 Ohms.
If the original cable installed was only capable of handling a 5 amp current flow this would now need to be replaced to
take into account the extra consumer load.
To fit additional worklamps on a vehicle without replacing original cabling , Worklamps utilising LED technology could
be used with power consumption as low as 7 watts.
Automotive
electronics books at amazon.co.uk 
Various designations exist for vehicle wiring and termination:
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BS AU7a
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British Standard AU7a is for colour coding of wiring used on older british vehicles.
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DIN 72 552
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DIN terminal numbers are used for defining identifying connection to various devices
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DIN 47 002
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DIN colour codes for electrical wiring
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12N
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Trailer wiring plug and socket for 12 volt rear lighting circuits to ISO 1724
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12S
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Trailer wiring plug and socket for 12 volt supplementary system wiring eg Reverse lamps, power supply, fridge etc. to ISO
3732
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13S
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13 pin plug and socket wiring for including lighting and auxilliary circuits ISO 11446
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24N
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24 volt commercial vehicle trailer wiring plug and socket for lighting and trailer braking control ISO 1185
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24S
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24 volt Supplementary S type plug and socket for reverse lamps, rear fog lamps , and supplementary circuits. ISO 3731
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ISO 7638
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24 volt Antilock braking system plug and socket.
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ISO 12098
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Commercial vehicle plug and socket wiring for trailer lighting , Auxilliary circuits, axle lift, traction control, CANbus
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Typical cable rating for single core pvc auto cable to BS6862
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Cable size
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Typical current rating
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9/0.3mm 0.65mm
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5.75 Amps
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14/0.3mm 1.0mm
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8.75 Amps
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28/0.3mm 2mm
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17.5 Amps
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35/0.3mm 2.5mm
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21.75 Amps
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44/0.3mm 3.00mm
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27.5 Amps
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65/0.3mm 4.50mm
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35 Amps
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84/0.3mm 6.0mm
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42 Amps
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97/0.3mm 7.0mm
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50 Amps
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84/0.4mm 10.00mm
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70 Amps
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266/0.3mm 20.0mm
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135 Amp Starter cable
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37/0.90mm 25.0mm
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170 Amps Starter cable
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61/0.9mm 40.0mm
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300 Amps Starter cable
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61/1.13mm 60.0mm
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415 Amps Starter cable
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To determine the correct size of replacement cable use cable manufacturers specific data for their product and the current
loading.The above table is an approximate guide only.Cable placement, length, and duty cycle of the circuit should also be
taken into account when specifying cable.
Mobile auto electrical services include fault finding and diagnostics , wiring circuit repairs to systems where wiring insulation
has chafed or melted causing burnt wires. Locating
bad connections on wiring systems . Accessory supply and installation.
Mechanical repairs. Breakdown callout available to Telford ,
Shropshire & surrounding areas.
Telephone 01952 247007
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