I have asked the question several times but always got different answers.
The power cable consists of several short power cables.
From the strain on the extension cords, it would work
but from the security I see darkly.
Let's assume the extension cables are 1.5mm²
At 150 meters, the line resistance would be so high that the 10 A circuit breaker connected upstream would not trigger in time
But it always depends on the cable. Look here. A long cable is no more than a resistor / impedance. Let's assume that there's a short circuit somewhere between the socket and the laptop / projector. If the resistance is too high, the circuit breaker will not trip because the load is too low. And the cable burns off. And every meter and every coupling increases the resistance. With 2.5mm ^ 2 I would have no concerns, but even with 5x 30 meters with 1.5mm ^ 2 I would still let it go.
And what does that mean? Sorry
If a short circuit occurs in the last extension, the other cables may go up in flames
At 150 m and a conductor cross-section of 1 mm ^ 2, the voltage drop in the cable would be around 1.5%. So instead of 220V you would only have about 216V with the projector. Your projector can handle that, so no problem 🙂
Initially it has been 230-240V since 1986
Then it does not matter whether your projector is still working, but whether the fuse and the FI still trigger in the event of an error.
This is certainly no longer the case with a normal B 16A fuse at 150 meters and 1mm ^ 2.
30 years of electrician in residential construction.
The VDE tells you that you have to calculate that. The result of whether it is permissible…
The loop resistance becomes too high and the voltage drop too great. In the event of a short circuit, the fuse will no longer be triggered, so the line could burn.
Your problem is that you listen to every Hans Wurst who thinks they know about electrical engineering.
In addition, all the transition resistances at the plug contacts of the plug and coupling add up.
Correctly
In addition, there's also the loop resistance up to the over gap point and the loop resistance of 300 meters + contact resistance at the plugs and couplings.
How much ohm resistance did you expect?
With the spec. Resistance of copper. But as already correctly pointed out, I did not take into account what the protective circuits do then. Then I only calculated the voltage drop for one line, but it also happens on the other, so that would be 0.0171 Ohm / mm ^ 2 * 300 = 5.13 Ohm.
One thing I have to say I'm an electrician myself and am always amazed how much other people know haha at school we learn something like that 😂😂
All of this is just math paired with some specialist knowledge.
