elektomaq

62.202

hace 6 años

Hello how are you
Actually, what you want to do is not right .... for more details you should mention:
if the installation corresponds to a dwelling or a premises, workshop or factory
Meters of each sectional
Type of cable and type of pipe used
Comment

bruma

12

hace 6 años

printing, consumptions are generally short-lived. unipolar cable nm247-3 by 50mm PVC pipe. the distance to the pass box is approx 8mts, from there to the first TS there is just 1 meter, to the other TS there are about 7 meters more. this last time little constant consumption, most of the time until it would say null or negligible, but at times there may be high consumption peaks as mentioned

bruma

12

hace 6 años

Logic tells me that the 16mm2 cable will be protected by the TS, and each circuit derived from the pass box will be protected by the TS in question. What would be the problem you say? thanks for answering

bruma

12

hace 6 años

Do you see the image? I had trouble uploading it to yoreparo's host

elektomaq

62.202

hace 6 años

And how long are those moments of maximum consumption or peaks?
The problem that I see is that the thermal of 63 is inadequate for both conductors, both the 16 and the 10 mm2 and on the other hand, a sectional circuit must not branch
The image looks good, there are some problems that we hope will be resolved as soon as possible when it comes to uploading images

bruma

12

hace 6 años

the 16mm2 plastix CF cable from imsa supports 66A in pipe with the conditions described, elektomaq
I think it's okay

elektomaq

62.202

hace 6 años

In three-phase circuits?

bruma

12

hace 6 años

The most important machine has 4-second spikes, but several. it is a guillotine, it can be 5 beats of that duration every 1 minute intervals

elektomaq

62.202

hace 6 años

See where you got the 66A if in that column of the table it says 2x or 3x
If it says 2x it is monophasic and in three phase according to data that I have supports 59 A
With the driver of 10 the same thing happens, in three-phase circuits it supports 44A
If I'm right the thermal is excessive. On the other hand the cable of 10 is not protected by the thermal of 40, it is protected (badly) by the one of 63 which is the one upstream of the cable

bruma

12

hace 6 años

I did it with the IMSA calculator with the correct correction coefficient and power factor
even with 16mm2 I have less than 0.60% voltage drop. I know that the thermal one normally protects downstream, but in this case it seems logical that in each section of 10mm2 it does not exceed the current of 40A, not so in the section between TP and pass box where the two consumptions and the only limiter are added would be the thermal bliss of 63A

elektomaq

62.202

hace 6 años

The IMSA calculator is excellent for calculating circuits, but it has an error, when reporting the maximum intensity of the unipolar conductor in question, it does not distinguish single-phase three-phase circuits, giving both the same value. being well known that in a three-phase circuit a unipolar conductor (any brand) supports less current than in monophasic not by the conductor, but by the conditions, this must be taken into account when calculating due protection

elektomaq

62.202

hace 6 años

As for the 10 mm2 conductor, it may seem logical to you that the thermal downstream of 40 downstream limits its intensity, and somehow it is, but if that driver in the future has an insulation problem it will not be properly protected, when talking about Possible isolation problems I do not only speak between phase and earth, it can also be between phases or between phase and neutral and the thermal one of 40 that is downstream, does not know.