Hi
I am currently working on a site and there main DB is like 3 meters away from there transformer.
The problem that i can see is that when i do a PSC test betwwen phase and nutural i get 0.01 ohms and a PSC of >10KA
then its X2 so 20KA arcoss the phases.
Now they have a DB with MCB`s in and some of them only have a 6KA rating on them. So i guess in the event of a short circuit they would explosde.
They do have 3 100amp HRC company fues but would these protect the MCB`s from exploding , and if yes if there ever was a short circuit would it just keep blowing the company fuses?
Thanks in advance
I am currently working on a site and there main DB is like 3 meters away from there transformer.
The problem that i can see is that when i do a PSC test betwwen phase and nutural i get 0.01 ohms and a PSC of >10KA
then its X2 so 20KA arcoss the phases.
Now they have a DB with MCB`s in and some of them only have a 6KA rating on them. So i guess in the event of a short circuit they would explosde.
They do have 3 100amp HRC company fues but would these protect the MCB`s from exploding , and if yes if there ever was a short circuit would it just keep blowing the company fuses?
Thanks in advance