30mA rcd protesction?

[zone77]

I am installing a 6mm armoured cable to supply a detached garage with a 2-way DB with 30mA protection. the supply cable is NOT buried but goes overhead on a suspended wire. my? is does the supply cable need rcd protecting? if so do i need to discriminate some how or will it be100mA?

this is a domestic installation.

 

[Mark.W]

Do you have RCD protection at the main db? If so why not put the whole installation on the RCD side and use a main switch in the garage board!

 

[zone77]

there is no rcd protection at main but the client doesnt want to walk back to the mains if something trips. he just wants to reset it in the garage.

 

[marty4]

Hi mate, It will need RCD protection as i'm guessing he'll be using mobile equipment such as lawnmowers etc.??

 

[Spudnik]

The sub main does not require RCD protection, as long as its swa, if the sub CU has an RCD main switch or RCBO's on each circuit.

 

[tacon]

The submain does not have to be rcd protected because it has earthed armouring but I think that you cannot extend the pme out to the garage you will need to install a earth rod so is a seperate system.

 

[TPES]

The submain does not have to be rcd protected because it has earthed armouring but I think that you cannot extend the pme out to the garage you will need to install a earth rod so is a seperate system.

True, but only if theres
Extraneous conductive parts in the detached building, (gas, water supplys ..etc..Otherwise its not needed

 

[tacon]

Do you not have to allow for this ? Or use a 10mm 3 core then no earth rod or bonding issues.