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Telephone: +44 (0)1437 890708. Facsimile:+44 (0) 1437 890757    email: webenquiries@bluebeehive.com

Useful Information

7 Pin trailer wiring
Pin Ref Colour Function
1 L Yellow Nearside (left turn) indicator
2 54G Blue Rear fog lamp(s)
3 31 White Earth - DO NOT RELY ON TRAILER CHASSIS FOR THE EARTH CONNECTION
4 R Green Offside (right turn) indicator
5 58R Brown Off side (right hand) tail and number plate
6 54 Red Stop (brake) lights
7
(Centre) 		58L Black Nearside (left hand) tail and number plate

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Caravan auxiliary socket
Pin Colour Function
1 Yellow Reversing lamp(s)
2 Blue Caravan battery charging
3 White Earth - DO NOT RELY ON CARAVAN CHASSIS FOR THE EARTH CONNECTION
4 Green 12 v power supply
5 Brown Sensing device
6 Red Refrigerator
7 Black Spare

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Quick weight conversion (Approximations)
1g = 0.035 oz
1 kg = 2.2 lb
1 oz = 28.35 g
1 LB = 0.45 kg


Length Quick Conversion (Approximations)
1 mm = 0.04 inches
1 m = 3.28 feet
1 inch = 25 mm
1 foot = 0.3 m


Convertor
0

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Calculating cable amperage

To establish which amperage cable is required calculate the sum of the wattage's that it will supply,
divide the total by the voltage,
then as a safety factor, add 25% then use the next higher Amperage cable available.
For example: cable required to supply two 25 w bulbs on a 12 v circuit.
2 x 35 = 70
50 / 12 = 5.83
5.83 x 0.25 = 1.46
5.83 + 1.46 = 7.29.
Next highest cable is 8.75 Amp


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Square area of cable

To calculate the square area of a cable the following formula should be applied:
strand diameter x strand diameter x Pi (3.14) x number of strands
4
For example: 14 strands of 0.30 (14/0.30) cable
0.3 x 0.3 x 3.14 x 14
4
=
0.3 x 0.3 x 3.14 x 14 = 3.956
3.956 / 4 = 0.989
Round up to 1.0 mm

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Diameter of a cable

To calculate the diameter of a conducter the following formula should be applied:
the square root of (4 x the area divided by Pi (3.142))

For example: find the diameter of a 1.5 mm2 conductor

Sq Root of 4 x 1.5 divided by 3.142 (Pi) =

Sq Root of 1.90961 = 1.38188 mm

Rounded to 1.4 mm

Note - There is a square root function available in the Windows calculator


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What size cable do I want?
To determine the size of cable required for replacement purposes, carefully count the strands of the existing cable and then use a micrometer to measure the size of a single strand. If there is no exact equivalent the next larger size should be used.


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