Fuses for Mid-70s House: Amp Ratings & Protection for Old, Emergency Installations

Question

I live in a block from the mid-70s, what should be the fuses (what should be written on them), how many amps should be to protect the old, emergency installation? how is it ?, which gives more amps - ie the fuses will knock out already at a slight short-circuit or overload ??

Thank you for your help

piórko · Answer

How is the installation done? Is the main fuse on the cage?, Aluminum wires? How many circuits in the apartment?

cnd · Answer

the main fuse is on the cage, aluminum wires, three circuits

axxx · Answer

Hello!!!
In old installations from those years, the fuses are graded and on
the main fuse is e.g. 32 A and goes down to the fuse up to 16 A
in front of your meter and then on your meter there is only 10 A because there will be no washing machines, automatic cordless kettles etc. fuse and it is now only PLN 120. You have to limit the use of high-power receivers at the same time.

cnd · Answer

Oh, and on the cage there is already a modern fuse, such a switch is switched up and down, it writes 16A on it Thanks in advance for your help

adamjur1 · Answer

There is not much you can do about it, if there are more circuits to the safety point then you can break them down into the maximum number of fuses.
Oh, the more Amps on the fuse, the less sensitive it is to overloads. (due to a short circuit, a functional fuse in a well-graded installation should trip regardless of its value). I would like to remind you about the anti-shock protection function - in the event of voltage breakdown on the zeroed housing element, the fuse must work (or burn out if it is fusible). parameter scatter.
Greetings J.

cnd · Answer

I understand that if I have 16 A in front of the meter, then these three fuses for the box behind the meter I have to buy 10 A ??

adamjur1 · Answer

This is the result of the principle of selectivity of protections, it is also important what is the characteristic, if the one in front of the meter is a gG fuse, then these can be C or (recommended) B. If you have a S B16A in front of the meter, you do not have much room for maneuver, 16 in the same group as 10 will switch off together with 10 in the case of a short circuit. Such grading is only useful for overloads, and a slight difference does not guarantee selectivity.
Greetings J.

cnd · Answer

one more question, I found out that I have to install fuses 10 and 16A in my installation, I just forgot to ask which ones should be for the circuit with lighting and which for the circuit with sockets.

Thanks in advance for your help

Anonymous · Answer

Where there is a washing machine, i.e. 16 A sockets, for 10 A lighting

lukaspl101 · Answer

I have a similar problem, I do not know what power to give the fuses in a residential building where I supplied the power from the house next to the 3rd phase, from the power connection

ROBSON33 · Answer

Hello In general, S191C16 is used for sockets, for S191B10 lighting circuits, but you do not write what security are house next door

Fuses for Mid-70s House: Amp Ratings & Protection for Old, Emergency Installations

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