3x2.5 Cable Capacity: Can It Handle 3kW or 4kW for Garage Workshop Tools?

Hi,

I am in the process of installing electricity in the garage and initially bought 2kW from the distributor, but I found that I may sometimes miss it. I'm planning to write a power boost application, but I have two questions:

1. Take 3kW or 4kW. Workshop tools will be used, such as: drills, grinders, vacuum cleaner, impact wrenches, occasionally a welding machine, etc.

2. I have a 3x2.5 cable, will it be enough for 4kW?

fussil wrote:

1. Take 3kW or 4kW. Workshop tools will be used, such as: drills, grinders, vacuum cleaner, impact wrenches, occasionally a welding machine, etc.

Take as much power as the tools you will be comfortable working with at once. i.e. count the lighting, let's say a vacuum cleaner with some power tool, more probably won't be needed. Means 4kW may be missing,

fussil wrote:

2. I have a 3x2.5 cable, will it be enough for 4kW?

It depends on where you want to put it and what the layout of the network is. If the system is TN-C and you want to use it as a main switch and connect the meter switchgear with protections, you absolutely cannot use it - minimum 10mm sq because this is the minimum cross-section of the PEN conductor.
In addition, the issues of voltage drop (how long is the cable), arrangement method (cooling issue), short-circuit loop impedance (so that the short-circuit protections work in the event of a short-circuit and the cables do not ignite.

In general, describe the installation in detail with the distances and plan - the number and type of circuits, etc. Everything you know.

The cable has a length of about 22 meters and is laid ~60 cm underground in a blue corrugated conduit. On one side connected to the meter box and on the other side in the garage to the 2x20A fuse box

Do you have the possibility to see how the cable is connected in the box with meters? A photo of some grilles, if any, which will allow you to see exactly what it looks like? The documentation of the switching station is best for this, the contract with the energy supplier in which the network layout is given?

What is the value of your pre-meter collateral? And what fare?

Unfortunately, I can't see the connection of the cable or the grilles because I don't have the meter attached yet. It will most likely be installed tomorrow.
Connection power 2kW, voltage 0.4kV
classified in group V
Pre-meter protection - 10A in the cable-measurement connector
power factor tg < 0.4
The low-voltage network operates in the TN-C system

Well, with 10A fuse you can draw about 2300 watts.

That's why I want to increase it to 4kW and the question is whether the cable will last that long

fussil wrote:

the low-voltage network operates in the TN-C system

In this case, I do not know who pulled 3 * 2.5mm there, but he did it wrong. Well, it couldn't possibly get any worse. The cable to be removed (you will use it in the garage) and there is 2x10mm and a section plus an equipotential ground in the garage, possibly the same with 4x10mm.

Added after 3 [minutes]:

fussil wrote:

That's why I want to increase it to 4kW and the question is whether the cable will last that long

It won't hold up, and it's not suitable for use as a WLZ. According to the standards, the PEN cable must be at least 10mm sq and it does not matter whether you will consume 20kW or 2kW with it. It's got to be the end.
I edited. I am asking for more subdued statements so that no one has to correct them. {TM]

moze-byc wrote:

for positioning is 2x10mm

I'd rather give it to myself:
1. Moderately available cable, i.e. YKY 2x10, moreover, the price in the 4x10 network is ridiculously low compared to 2x10
2. You will need a 3 phase device soon and more costs with cable replacement / digging etc.

With the replacement of the cable, I advise you to wait for the conditions from ZE anyway. We can assume the division of PEN in the garage, and if the "state within the state" (ZE) does, we have no influence on it ...

Where are you from Author? What operator?

adwlodar wrote:

the price on the 4x10 network is ridiculously small compared to 2x10

Tell that to someone who preferred to buy a 2.5mm

adwlodar wrote:

With the replacement of the cable, I advise you to wait for the conditions from ZE anyway. We can assume the division of PEN in the garage, and if the "state within the state" (ZE) does, we have no influence on it ...

The division will have to be in the garage, I don't see any other option. But we will see.

fussil wrote:

On one side connected to the meter box and on the other side in the garage to the 2x20A fuse box

... (3 posts further)

pre-meter protection - 10A in the cable-measurement connector

Do you see the logic here? What is your garage security job? I omit the fact of pre-counter protection, but such a nominal one cannot be found in the garage.

Say I'm not mistaken, in the ground you have a "cable" in white outer insulation?

I don't know who did it, but don't let that someone play electric because it can do more harm than good.