I bought at Castorama six nameless dvuhkilovattnyh heaters for 300 rubles.
Why guess? ;)
Of course the same in order to create a large load and be able to test cables, machines and so on. Such heaters can just put in the window to the street, they were heated.
The real power of heaters was about 1700 watts (there is the half-power mode).
I have long wanted to conduct an experiment and find out what all the same load kept cables VVG 3x1.5 (real cross-section of about 1.37 mm²) and 3x2.5 (real cross-section of about 2.24 mm²). I wrote about the understatement of sections: ammo1.livejournal.com/1054644.html.
Want to find out what the current hour can be passed through these cables, so they are not heated above 45 degrees (current well and at the same time, the heating cable is 70 degrees, the maximum temperature of regulations).
Let me explain why this is necessary.
The vast majority of electricians sure to all outlets need to pull cable 2.5 square. Most likely it is redundant and 1.5 (or rather real 1.4) mm² can be quite sufficient. I have all the wiring to sockets in the room apartments made cable VVG 3x1.5 and only goes to the kitchen VVG 3x2.5.
There is another problem - many electricians put on 1.5 mm² wire machines 16A, and 25A wire 2.5 mm² machines, not realizing that the operating currents of the thermal protection of the machine is much the above: any circuit breaker can withstand a lot of time without having to disconnect the current 1.13 x nominal value, ie 18.08A for machine rated for 16A and 28.25A machine rated 25A. To an hour the machine is turned off when the load current 1.45 x nominal value of the machine, that is 23,2A for 16-amp machine and 36,25A for 25-amp.
Thus, in order to avoid a fire broke out, cable, connected to a machine 16A must withstand for an hour and a lot of current is 23.2A 18.08A. the cable will withstand the actual cross-section 1.4 mm² such currents? Not sure.
Cable, connected to a machine 25A must withstand for an hour and a lot of 36.25A 28.25A. Too much doubt that VVG 3x2.5 with the actual cross-section 2.24 mm² capable of such. Soon find out.
P.S. On the work machines and the choice of the correct denomination and characteristics read in Elektroshamana: cs-cs.net/avtomaty-ne-vsyo-tak-prosto-no-interesno-vybor-nominala-avtomata.
© 2019 Alex Nadozhin