Wiring in stables - advice please

[sidekick]

I have a job to wire a brand new stable block.
x 1 tack room with x 1 strip light and x 2 2g sockets.
x 4 stables with x1 strip light in each with switches outside doors
x 4 bulk head lights under canopy.
Temp DB already in tack room supplied by armoured cable from DB in house off 32A RCD protected MCB.
Temp DB also currently supplying power to 3KW horse walker and 1kw septic tank.
Additional requirement for Stable block - Room containing shower to wash off horses.

Assuming cable size correct for, or can be changed to correct size for a higher rated MCB.
Is it correct as follows : 6A MCB for septic tank supplied in armoured cable - 20A MCB for horse walker supplied in armoured cable - 6A MCB for lights supplied in standard pvc cable in plastic conduit - 16A MCB for sockets supplied in standard pvc cable in trunking - Can the shower be safely in corporated into the board as all the above already looking at a 50A MCB in house and 10mm armoured cable. Will TNCS from house cover earth requirement and will 300ma RCD be a must. First post so go easy as all work so far been domestic. Good advice appreciated.

Cheers
Sidekick

 

[electricAl]

Unless i`ve misunderstood your original post, did you not state the sub to the stable is 30mA protected? Obviously you`ll rectify this when you put in the new feed, yes?

 

[electro]

Hi

The house seems already loaded and if you add this supply to it you may overload the supply putting the house in jeopardy , your also installing a system that does not allow expansion for both the house installation and the stable installation. You don't need the 100mA type s if your enclouse is non conductive and your tails are very short in length. Protection of final circuits as per TT system.

Regards

 

[sidekick]

Unless i`ve misunderstood your original post, did you not state the sub to the stable is 30mA protected? Obviously you`ll rectify this when you put in the new feed, yes?

Yes.
Current source from house on 32A mcb 30ma protected and temp sub in stable also has current circuits for septic tank and horse walker on 6A and 16A 30ma protected. Was originally looking at 300ma board with 30ma for sockets as sub but revised to 100ma board with 30ma sockets if on TT.

Hi

The house seems already loaded and if you add this supply to it you may overload the supply putting the house in jeopardy , your also installing a system that does not allow expansion for both the house installation and the stable installation. You don't need the 100mA type s if your enclouse is non conductive and your tails are very short in length. Protection of final circuits as per TT system.

Regards

Ok - To recap, Now looking at new supply to stable block on TT system as house already loaded etc, with plastic DB. As installation in Agricutural site still need 100ma protected circuits (should be 300ma) except sockets which are 30ma protected. One socket seperated and 100ma protected for horse clipping tools (should also be 300ma). Circuits run in PVC cable in plastic conduit (originally looking at rubber sheathed cable to protect against amonia attack in galvanised steel conduit offering protection from rodents and horse chewing)

 

[electro]

Hi


100mA is for final circuits, not as a main switch, I would use 300mA so you get some discrimination between the personal protection RCD's (30mA & 100mA). I would only install the 100mA if the TT installation doesn't go well and you end up with a high ze even then I would bang another rod in.


Regards

 

[sidekick]

Hi


100mA is for final circuits, not as a main switch, I would use 300mA so you get some discrimination between the personal protection RCD's (30mA & 100mA). I would only install the 100mA if the TT installation doesn't go well and you end up with a high ze even then I would bang another rod in.


Regards

Yes thanks electro. By 300ma board I did mean for final circuits after the main switch.

I now assume no way around getting a new supply to the stable block rather than a feed from the house.
Not going to go down very well with my client

Anybody got thoughts on the conduit - Pvc ?? or Steel ??

 

[ian.settle1]

Client may not want conduit but where horses are involved metal conduit is the best idea, should they say no, say to them horses can chew through cable but not metal conduit and which do they value more the cost of horses or the cost of installation

Remember when doing 2391-20 Design course a previous exam paper was a stables and it was required to be done in metal conduit because of the horses.

Another thing to remember is if somthing happens to one of the horses becauseof your installation make sure your insurance is up to date.

 

[sidekick]

Client may not want conduit but where horses are involved metal conduit is the best idea, should they say no, say to them horses can chew through cable but not metal conduit and which do they value more the cost of horses or the cost of installation

Remember when doing 2391-20 Design course a previous exam paper was a stables and it was required to be done in metal conduit because of the horses.

Another thing to remember is if somthing happens to one of the horses becauseof your installation make sure your insurance is up to date.

Thanks Ian,
Client does not want steel conduit in site on the outside of there lovely stone stables? Would there be anty real problem if run down the inside and through the back of a termination box to the switch on the outside?

Does anyone have a copy of previous 2391-20 design project on stables along with soloution ??