Top quality 12 volt cables from Durite. Always use a high grade cable with split charge systems/relays to avoid voltage drop.
Use 8.75 amp cable for interior lights etc., 17.5 amp cable for wiring to a fridge, extractor fan etc., 21.75 amp cable for diaphragm water pump etc.
Use the 35 amp and 70 amp cables for item with a heavy draw in amps such as inverters etc. To work out your power consumption see the volts, watts and amps explained page.
All Durite cables/wires are rated "Continuous", which in layman's terms means that they'll handle their given current rating forever and a day without burning out or breaking down and are top quality cables.
More information about campervan/motorhome 12 volt and mains wiring and electrics can be found in "The Motorcaravan Manual", by John Wickersham.
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