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Posted By Topic: AS/NZS3010:2017 Gen Set

chau428
May 10 2018 14:32

Having a read through this standard and have a question. Section 4.3.2.3 says that the incoming supply to the installation from a gen set shall be protected by a separate overcurrent protection device located within the installation and operate all live (active and neutral)conductors. Looking at Figure 4.2 and 4.3, the Generator Supply Main Switch only switches the active, but the asterix states that this includes the overcurrent protection.... Shouldn't this figure also show the neutral being switched too to comply with 4.3.2.3?
   

pluto
May 10 2018 17:21

chau428 May 10 2018 14:32
Your comment
Having a read through this standard and have a question. Section 4.3.2.3 says that the incoming supply to the installation from a gen set shall be protected by a separate overcurrent protection device located within the installation and operate all live (active and neutral)conductors. Looking at Figure 4.2 and 4.3, the Generator Supply Main Switch only switches the active, but the asterix states that this includes the overcurrent protection.... Shouldn't this figure also show the neutral being switched too to comply with 4.3.2.3?

My comment
You have found one of the many errors in the published standard. There are a number of errors in other causes too. Use the drawing as being the correct instruction.

The purpose of this over current device mounted in the switchbaord is to protect the internal wiring of the switchboard between the appliance inlet (gnerating set output into the switchboard) and the changover device and the switchboard internal wiring all way until the final subcircuit protective device what ever form that it takes. This wiring may NOT be protcted by the generating set overcurrent device, in particular, if the generting set output current is very large in respect the rating of the incomming appliance plug.