Many people disdain goods from the traffic light, arguing that cheap goods cannot be of high quality. I agree with this argument. But there are exceptions to the rules, so sometimes I buy goods from them. This time I checked the extension cord with them under load. An article about this is available on the channel. The link will be at the end of this post.
Well, now I want to check: What happens to the extension cord at maximum load if it is not unwound? As recommended by the manufacturer and some users.
But first a problem for the readers, I myself am not a boom, boom.
According to the manufacturer, the characteristics of the power strip are as follows: PVA 2 x 0.75. But is it really so? I disassembled the outlet and measured the diameter of the wire with a caliper, it averaged 0.12 mm. And the number of wires in the core is 13 pieces. As a result, what is the real cross-section of the wire in the extension cord? I am happy to read the clever commentary.
Photos in the gallery, enjoy your viewing.
Tests
I rolled the wire into a coil, imitating its laying as on any drum, pulled it off with ties for a tighter fit of the veins to each other. In the braid of the wire, the thermometer sensor is fixed with the help of electrical tape. Thus, I know the temperature of the braid.
I also use a wattmeter to accurately determine the load parameters.
I switched on an electric heat gun through an extension cord with a load of 1.5 kW. But since the voltage in the garages is low, the wattmeter showed a real power of 1200-1300 W. Which corresponded to the maximum load on the wire declared by the manufacturer. The wire temperature at the beginning of the test was about 11 degrees Celsius.
But then she went "heat", the temperature of the braid of the extension cord began to rise smoothly. After 10 minutes, its heating increased to 34 ° C. Which is quite a lot.
And after half an hour, the temperature rose from 11 ° C to 55 ° C. Which is very close to the critical value. If the outside temperature was about 30 ° C, then the wire would burn out.
Conclusion
Always unwind the wiring under heavy loads. The stretched wire cools better and does not overheat. Tests of an uncoiled, extended extension under the same load - link
I hope the information is useful! And deserves your approval in the form of a like. Thank you.