Quote:
Originally Posted by Polestar Pete
Bear in mind that if you want to use an extension lead on a reel, then you'd need to unwind it fully as the amperage drops when the lead is coiled up.
|
That's incorrect, the amperage is dependent on the load. The reason coiled extension reels heat up is that there is a loss in the cable, causing it to heat. When the lead is uncoiled the heat dissipates into the air. However, when the coil is left on its drum, and the load is significant, the heat loss is contained within the coiled cable.
What is often forgotten is that there is always a loss in electric transmission, even with the ubiquitous power lines. It is minimised by using larger conductors. Hence the recommendation to use heavy duty extension leads, not the cheap, lower capacity B&Q and similar ones.