100ma RCD

[davelerave]

what spray are you using- i'm looking for something similar

 

[Risteard]

Still don't agree that 100mA/300mA/500mA etc. time-delayed RCD can't be used as a main switch.

Minimising inconvenience in the event of a fault doesn't require there to be no protection in the event of a fault.

 

[devon1]

The brand is 3-IN-ONE professional, high performance lubricant.

Drives out moisture
dramatically reduces frition and wear

 

[Deleted member 9648]

P 24 of the OSG shows a 100ma T/D RCD used as a main switch on a TT system,on a split load DB with only some final circuits 30ma protected.....I cant see how this can comply with 314.2 because a fault on any of the circuits not on the 30ma side will trip the whole installation.

A T/D RCD clearly can be used as a main switch as per the OSG I quoted above.
However a fault on the main switch side would trip the entire installation including the 30ma protected circuits in the arangement shown in the OSG.
This is somewhat contradictory to 314.2

 

[cornburn]

it may be better to test with fault current imo - before pressing the test button

what do you think?

On my NIC inspection I had a note on my assessment sheet for pressing the test button before testing with the meter. Apparantly it could damage it and it should only be tested last after the other tests have successfully been completed.

 

[Spudnik]

I have recently renewed a CU on a TT system.

100mA RCD as main switch in meter cabinet with wylex rewireables.

Therefore converted to PME, new, dual RCD CU, left 100mA in situ.

Couldnt really see the point in ripping that out and replacing with a main switch.

 

[Risteard]

So long as it discriminates then there is no Regulation breached.

 

[davelerave]

100mA TD upstream and all final circuits having 30mA protection then it shouldn't give trouble

SP rcbo's downstream might take out a DP rcbo as the N-E fault isn't cleared by them

 

[Jurasic Spark]

I have recently renewed a CU on a TT system.

100mA RCD as main switch in meter cabinet with wylex rewireables.

Therefore converted to PME, new, dual RCD CU, left 100mA in situ.

Couldnt really see the point in ripping that out and replacing with a main switch.

Who did this you or the supply authority?

 

[davelerave]

we used to have a dodgy TT system here at one stage( pre-rcd days)

i think the TT with all circuits 30mA protected may be safer than T-N-C-S

you'd need to confirm suitability-suppliers neutral multiple grounding and secure connnection to trafo

wouldn't be desirable to be the sole tn-c-s in a TT area either

 

[ezzzekiel]

Who did this you or the supply authority?

im pretty sure he got dno for the conversion

 

[8145keith]

Hi there,

Definitely code 1 no bonding to water service

The rest code 2 s and code 4s

Regards KJ

 

[ezzzekiel]

eh ?

 

[oxford 12]

100mA rcds in tt systems comply with previous regs ,so are only code 4

 

[Benny_Boy]

The brand is 3-IN-ONE professional, high performance lubricant.

Drives out moisture
dramatically reduces frition and wear

Isn't spraying a flammable liquid onto a area where arcing is going to be present something of a fire risk?

Better to use some teflon cycle lubricant in a pump not an aerosol.