I wanted to connect the house to the 1f generator. There is a 4-pole switch network-0-genset. The generator is grounded. An electrician came and stated that he would not bridge 3f to one (in the case of connecting the generator) because the 3-phase differential would not let it pass. I read on...

It will pass, it will pass. And it will even work properly. The problem is with the overcurrent protection, and (mainly) with the neutral conductor. Letting 16A per phase on a 3F network, 0A flows through the neutral conductor. Overall, as much will flow through the neutral conductor in the worst practical case as in a single phase conductor. With a bridge, the neutral conductor current adds up algebraically rather than geometrically, so with three 16A fuses, 48A would flow through the neutral conductor, which would melt it very quickly. The matter could be solved either with a low-power generator (max. 3.6kW), or with a motor circuit breaker mounted on the generator cable, or any circuit breaker with an overload segment, but without (or with a very large) short-circuit segment. This would protect the installation from such a hazard.

. It will operate normally until you exceed the power of the genset and it shuts down.

Obviously the genset is small in power - up to 2kW and I am aware of that. It is to run selected lighting and a fridge, maybe boiling water. The house installation is to replace extension cords. Additional question, how will the induction hob behave when connected to one phase? It is now connected to 3, but from what I remember it also had the option to connect to one by primitive bridging. Conclusion - I need to look for another electrician.

Connecting 1f Generator to House: 4-Pole Switch, 3-Phase Differential & Electrician's Advice

gonzo93 2217 3

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#1 20000208 29 Apr 2022 18:18

gonzo93 gonzo93

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Post #1
20000208 29 Apr 2022 18:18

I wanted to connect the house to the 1f generator. There is a 4-pole switch network-0-genset. The generator is grounded. An electrician came and stated that he would not bridge 3f to one (in the case of connecting the generator) because the 3-phase differential would not let it pass. I read on the net that the differential balances the amount of input and output current. Reacts in the event of a shortage (leakage) regardless of whether the phases are different or not.
Please give me your opinion.
edit. below is a diagram. I hope it will be readable - I did in Word.

---- [mod = "Krzysztof Reszka"] Create your topic and do not add to someone else's. [
Separated from the topic: Connecting the aggregate to the home installation.
by Krzysztof Reszka on 29 Apr 2022 18:44
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#2 20000390 29 Apr 2022 20:14

Anonymous Anonymous

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20000390 29 Apr 2022 20:14

It will pass, it will pass. And it will even work properly.
The problem is with the overcurrent protection, and (mainly) with the neutral conductor. Letting 16A per phase on a 3F network, 0A flows through the neutral conductor. Overall, as much will flow through the neutral conductor in the worst practical case as in a single phase conductor. With a bridge, the neutral conductor current adds up algebraically rather than geometrically, so with three 16A fuses, 48A would flow through the neutral conductor, which would melt it very quickly. The matter could be solved either with a low-power generator (max. 3.6kW), or with a motor circuit breaker mounted on the generator cable, or any circuit breaker with an overload segment, but without (or with a very large) short-circuit segment. This would protect the installation from such a hazard.
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#3 20000415 29 Apr 2022 20:37

gonzo93 gonzo93

Level 12

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Post #3
20000415 29 Apr 2022 20:37

Obviously the genset is small in power - up to 2kW and I am aware of that. It is to run selected lighting and a fridge, maybe boiling water. The house installation is to replace extension cords.
Additional question, how will the induction hob behave when connected to one phase? It is now connected to 3, but from what I remember it also had the option to connect to one by primitive bridging.
Conclusion - I need to look for another electrician.
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#4 20000524 29 Apr 2022 22:15

Anonymous Anonymous

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Post #4
20000524 29 Apr 2022 22:15

gonzo93 wrote:
Additional question, how will the induction hob behave when connected to one phase? It is now connected to 3, but from what I remember, it also had the possibility of being connected to one by primitive bridging.
.
It will operate normally until you exceed the power of the genset and it shuts down.
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