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Discuss Industrial agricultural installlation in the Electrical Forum area at ElectriciansForums.net

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Hi guys me and my boss will be doing a complete re new of a farm installation we will be removing the bus bar system and installing a a 3 phase distribution board to supply sub main boards to other locations on the farm with my understanding a would not put a 300mA main switch incase it took out the whole of the installation there for would I put a normal main switch inside the 3 phase distribution board and all 3 phase sub boards have 300mA main switch and outgoing circuits at 30mA rcbos and for single phase boards all to be rcbos or split rcd boards ? Or is my understanding wrong to this?
 
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Lucien Nunes

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What will be the Ze at the main board at the origin? Will it be low enough to protect the board without the aid of the single upfront 300mA RCD?

BTW, please call them RCDs. You can't have a '300mA main switch' although you can use a 300mA RCD as one.
 
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What will be the Ze at the main board at the origin? Will it be low enough to protect the board without the aid of the single upfront 300mA RCD?

BTW, please call them RCDs. You can't have a '300mA main switch' although you can use a 300mA RCD as one.
What will be the Ze at the main board at the origin? Will it be low enough to protect the board without the aid of the single upfront 300mA RCD?

BTW, please call them RCDs. You can't have a '300mA main switch' although you can use a 300mA RCD as one.
My boss’s has walked over the job I haven’t went to the job personally yet thing is I’ve never done a farm before as iam a 3rd year apprentice but more knowledge from you guys the better hence it’s quarter past 9 on a Wednesday night and here iam let’s say it’s a tns with a ze of 0.22ohms evan if it is low enough regulation could it evan be a 100 mA there for I need the theory behind your answer thanks mate
 

JD6400

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Is it just an arable farm only or is there livestock about or likely to be in the future.
But what ever the earthing arrangements , you will need an s type RCD to a maximum value of 300ma up front.
 
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Is it just an arable farm only or is there livestock about or likely to be in the future.
But what ever the earthing arrangements , you will need an s type RCD to a maximum value of 300ma up front.
Thanks mate! So 300mA upfront my worry was incase it tripped that it would take out every sub board? There is live stock in a cow shed
 
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If you have livestock , you can pretty much guarantee you will need to stake the place.
The 300mA is for fire protection .
Have a good read of section 705 .
Will have a good read of it mate thanks a lot for this as in stake it you mean earth electrode then earth all the conductive parts that the live stock touch
 

JD6400

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If there is livestock present it is almost impossible to satisfy the requirements not to TT the place .
As for segregation ( or what ever it is now referred to in the 18th ) the s type upfront will let you discriminate locally through the installation if design correctly
 

JD6400

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Also I prefer to not only stake at the supply incomer and locally throughout the installation , but also tie them all together albeit through the armoured only if not a core as well to give you you what I suppose you could call an earth nest.
As of yet I've not been shown why this isn't a good idea but I will put my tin hat on now !
 
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Also I prefer to not only stake at the supply incomer and locally throughout the installation , but also tie them all together albeit through the armoured only if not a core as well to give you you what I suppose you could call an earth nest.
As of yet I've not been shown why this isn't a good idea but I will put my tin hat on now !
Yeah I get what you mean mate thank-you for the update mate I appreciate it greatly
 

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Am I the only one wondering why it seems to be left to an apprentice to design such a safety critical installation? No offense intended to the "apprentice", at least he seems to be conscientiously trying to do the right thing.
 
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Am I the only one wondering why it seems to be left to an apprentice to design such a safety critical installation? No offense intended to the "apprentice", at least he seems to be conscientiously trying to do the right thing.
No your absolutely right on this topic mate I study a lot out of hours to get things right and correct I love to learn my journey min is out his depth by far it is a worry you would need to be very competent for this kind of install
 

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