2.5 square wire cross-section and a 20 A fuse - can it be used?

Question

Hello.
I want to connect a device that has a 20A current protection, only in the box I have a 16-amp fuse.
I am asking for advice, because I do not know if there is a 1.5? cable on the 2.5? cross-section that goes to the box, and then I can change the fuse to 20A ??
Distance from the fuse box on the wall approx. 8-10 m.

rtvserwisant · Answer

You cannot change the fuse to 20A, even the 16A fuse is too much because you have a 1.5 cable connected to the socket.

ciuqu · Answer

Apart from 1.5mm2 cables, the long-term load capacity of the sockets is 16A and protection greater than 16A should not be used.

What is this device, what is its power or current, and what is your pre-meter protection?

haneb · Answer

16A is too much if the cable runs through an insulating wall. Ask the author what kind of cable it is, how many veins it is, how it is routed and in what.

kkas12 · Answer

The basic question is: what device is it about and not going back to the stage of designing the installation. And the answer is the requirement for a separate circuit for loads exceeding 2kW.

mateusz0081 · Answer

Thanks for the answers.
The cables used are 3x 2.5 ? from the box to the box, while from the box to the socket 3x1.5? are located in the concrete wall and covered with plaster of paris.
The device is a migomat welder, I do not know exactly what I will buy, but the welding current range is 30-200A.

I would like to add that the section from the can to the socket with a 1.5? cable is 1.5 m, and in front of the can, as I wrote above, so do you think that it will be such a big threat if all the rest is pulled 2.5??

Counter protection is 3x 25 A

kkas12 · Answer

Dear friend, you want to force a satisfactory answer.
Meanwhile, it looks like this receiver should be powered by a separate circuit, because receivers with a power of more than 2kW are supplied in this way.
Also remember that the load of an ordinary socket is 16A, so you cannot protect it with 20A.

TWK · Answer

As colleagues wrote - the only output is a dedicated circuit for such a receiver. Cables laid from the switchgear to the appropriate socket. There's no other way.

To protect 1.5 mm? wires, a rare 13 A circuit breaker can be used. For laying in the wall, the long-term current carrying capacity of such a wire is probably 14 or 14.5 A, and such protection allows for greater freedom of use of receivers than 10 A.

mateusz0081 · Answer

Strong from the can the same 2.5 kw cable and according to the table it will be fine. Thank you for your help.

kkas12 · Answer

No buddy, it won't be okay.

mateusz0081 · Answer

Looking at the table, the cross section of 2.5 kw corresponds to the standard to be able to power such equipment. If I have misunderstood, please explain ...

kkas12 · Answer

I explained everything to you (and not only me) in previous posts.
The only problem is your minimalist approach with the maxim "Pole can".
This is how you will bend and interpret the standards to suit you.
You can afford a welder and it is a waste of money for the proper execution of the dedicated circuit so that its operation is safe.

retrofood · Answer

Another example where I want it this way is going to replace reliable knowledge. I wish you happiness and health.

haneb · Answer

For 1.5mm? and two loaded conductors, 15A in the thermal insulation wall and 21A in the standard wall.

mateusz0081 · Answer

Actually, I look like this now and I'm sorry, the appropriate cross-section would be 4 mm sq. Are they perhaps lower than 3 mm sq?

pshemo13 · Answer

No.

Akrzy74 · Answer

If a load capacity table is inserted, the source for verification should be provided to prevent such conclusions: Here is the load capacity table and a small comment -> Link To the question asked in the first post, my friend received an answer already in the 2nd and 3rd post! Further discussion is unnecessary.

haneb · Answer

The source is the PN-IEC 60364-5-523 standard after conversion to the design temperature for Poland of 25'C. The table provided by a colleague on that topic is for 3 loaded veins and a Mediterranean design temperature of 30'C.

Anonymous · Answer

2.5mm5 cable is ok If the welder has a cord with a plug, it is provided for the socket. With a rated current of 16A. You are not allowed to use the B20 fuse. You can put a 16A fuse with a different characteristic. But 16A.

mateusz0081 · Answer

What do you mean, buddy, about an ordinary wall and a thermal insulation wall?

haneb · Answer

Plain wall - brick - method C Thermo insulating - it perceives heat worse, i.e. the cable heats up more - wooden, skeletonized with wool - method A

vodiczka · Answer

All or only permanently connected? What about a 2.4kW kettle, a 3.0kW portable fan heater, a 2.5kW vacuum cleaner?

TWK · Answer

An interesting list of materials can be found here: http://ise.pl/index.php?option=com_jfusion&It...file=viewtopic.php&f=16&t=6767&st=0&sk=t&sd=a If you do not know the material of the wall, it is safer to adopt the arrangement A.

vodiczka wrote:
2.5kW vacuum cleaner

It is already forbidden to sell vacuum cleaners with a power of 2000 W. As for the rest - according to N SEP E 002 there should be a separate circuit, but there is little chance that an inventive housewife will not turn on these devices elsewhere.

Anonymous · Answer

I have a 2.6 kW iron, I don't even try to explain to my wife: N SEP E 002 because it would end up with me having to iron. There is no point in continuing the topic because the problem is fictional. The author of the topic should buy a welding machine with a cable terminated with a 16A plug and do not fumble with the installation because he does not know anything about it.

vodiczka · Answer

It is not about an inventive hostess, but I did not notice that the manufacturer informs about such a recommendation in the manual. Anyway, as far as I can imagine a separate circuit for the kettle (usually it has its permanent place in the kitchen), this connection of the vacuum cleaner may be a problem.

sq3evp · Answer

The kettle does not work continuously, the fan heater should not work either (it has a thermostat that protects against overheating, but I have seen one without a thermostat), the vacuum cleaner does not work in a continuous cycle either.

vodiczka · Answer

As for the kettle, iron and vacuum cleaner, we agree, but the protection of the fan heater against overheating does not serve to limit the time of its operation. Do not confuse the thermostat with overheating protection, even if it has a thermostat set at +18 and heats a large room with an initial temperature of +5, it must heat up for a long time. A properly designed fan heater (as long as there is no air inlet clogged with dust) can work for many hours and the protection will not work.

Xaveri · Answer

The welder also does not consume electricity (20A) continuously ...

Anonymous · Answer

It should be, and what will be if it is not a dedicated circuit? There are no dangers with proper installation. Do not add demagogy to the 2W circuit - non-allocated. 2.5mm2 circuit protected by 16A. You can pull 16A - 3680W and the fuse will not blow out. Neither installation - also the circuit will not hurt. 3680W is not a pharmacy, it is not a cutoff value. 16A fuse will blow out after some time at 20A current. Theoretically 1.45 In. No dedicated circuit, it's just a lack of comfort in operation - and nothing else. Because as in the kitchen in the oven circuit 3600W there is also a socket for a kettle, it's a kettle + oven and the fuse blows out. Each circuit with sockets must be protected with a 16A fuse - and no more, because this is the permissible -16A - current of each socket in the circuit.

sq3evp · Answer

It does not charge, but the kettle is secured with a 16A fuse - the load is cos ? = 1, and the welder has cos ?

2.5 square wire cross-section and a 20 A fuse - can it be used?

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