generator

marknjb

i have to wire up an old three phase genny there was a control panel on it but someone gutted it.all i have is three wires in connecters (phases) i also have a wire coming out of the gen bolted on to the frame which looks like an earth
my question is can i use the earth connection as a neutral terminal as i assume its connected to the star point

thanks marknjb

M cebee

marknjb wrote: »

i have to wire up an old three phase genny there was a control panel on it but someone gutted it.all i have is three wires in connecters (phases) i also have a wire coming out of the gen bolted on to the frame which looks like an earth
my question is can i use the earth connection as a neutral terminal as i assume its connected to the star point

thanks marknjb

have you tried testing to see if it's the star point

marknjb

could not start it no battery. just thought it would have to be connected to it like in a ordinary supply

M cebee

marknjb wrote: »

could not start it no battery. just thought it would have to be connected to it like in a ordinary supply

with an ohmeter?

2011

marknjb wrote: »

just thought it would have to be connected to it like in a ordinary supply

Not necessarily.

What are you planning to do with it?
If you are connecting it to an installation that is neutralized will the neutralizing link that is part of the installation be in circuit? Or will it be switched out of circuit when the generator is connected? When the generator is in circuit there should be no more than one neutralizing point.

marknjb

its just being used to run a 3 phase stake pealer in a farmers yard

2011

marknjb wrote: »

its just being used to run a 3 phase stake pealer in a farmers yard

So this would be a stand alone installation electrically separate to everything else?

marknjb

yes it is stand alone .i did not check any thing with a meter as i was just passing in the car at night and just called in to see what i needed it was also pissing rain

2011

I would think that the generator should be neutralized at the star point and this should be connected to a descent earth electrode. However this is not really my area. I am working with a few people that would be considered experts in this field. If I get a chance I will ask.

Bruthal

With a stand alone generator powering a stand alone machine, there should be no need of an earth rod.

What rules and regulations say, may be another matter.

marknjb

if i want to connect something 220 v to this machine eg. contactor coil can i use the earth connection

2011

marknjb wrote: »

if i want to connect something 220 v to this machine eg. contactor coil can i use the earth connection

If has a line voltage of 380VAC then it will be 220VAC between neutral and any phase.

Bruthal

2011 wrote: »

If has a line voltage of 380VAC then it will be 220VAC between neutral and any phase.

Im sure 400v/230v will be fine. I think the question is more asking can the earth wire be connected as neutral.

With someone after stripping the control board off the generator, it would probably be wise to test it and check it out properly to see whats what with it.

M cebee

marknjb wrote: »

if i want to connect something 220 v to this machine eg. contactor coil can i use the earth connection

I think those gennys are wired in 5core
tn-s
contactor coil you can use 380/400 obviously if thats all you need the neutral for

marknjb

need to wire timers as well