24-07-2014, 04:13 PM
Its more likely to be to do with its ability to dissipate heat due to the thinner insulation. Bundles of wire can easily melt with surprisingly small currents - the cables in the middle of the bunch can't lose heat, so melt.
Ideally, you want tough, thin, insulation that is rated a few times higher then you will experience - in this case there is no point having 1000V cable when you are unlikely to see anything over 20V. Thin PTFE cable is good as it is extremely tough, dissipates heat easily (thin walls), is unaffected by high temperatures (good to 250C plus), resistant to chemicals found in cars (salt, hydrocarbons etc.) and easy to "pull" through gaps..
Ideally, you want tough, thin, insulation that is rated a few times higher then you will experience - in this case there is no point having 1000V cable when you are unlikely to see anything over 20V. Thin PTFE cable is good as it is extremely tough, dissipates heat easily (thin walls), is unaffected by high temperatures (good to 250C plus), resistant to chemicals found in cars (salt, hydrocarbons etc.) and easy to "pull" through gaps..
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