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Cheers Roughcaster I'll need to speak to the roughcaster in the morning. Many thanks for your help and advice.

Hi Roughcaster The PVA that I sourced for the roughcaster is Exterior Grade - Waterproof PVA from Unibond. I take it that once this dries it can not come back to life when wetted ? I have uploaded a picture of one section of the wall which was stripped back. You can see the blocks are...

Hi Roughcaster I followed are earlier posting of yours and sourced Unibond PVA - Exterior Grade - waterproof version. Screwfix stock it. I am keen to have the stipple coating, but the new harler seems a little reluctant to apply it ? What will happen by applying diluated PVA to the...

Hi Roughcaster Sorry to bother you with this one. Had all the wet harling chipped off the house - came off clean pretty much everywhere - there was no apparaent bond between the scratch coat and the standard dense concrete blocks. New roughcaster is going to PVA the walls first to seal...

Hi NotHimAgain My sincere thanks. I will discuss there points with the electrician to ensure that the installation is safe. Thank you once again.

Hello again NotHimAgain I should have said that the local consumer unit in the workshop will be a split load type with a 30mA RCD incorporated to protect : - the air compressor ( via 20A MCB - dedicated circuit ) - the water heated ( via 16A MCB - dedicated circuit ) - the ring main...

Hi NotHimAgain Many thanks for your reply. If the loop impedance from the house to the workshop via the B40 is less than 1.15 ohm could we use a Type C MCB in the local consumer unit in the workshop for the compressor ?

Hi Many thanks to everyone. So the first thing that we will need to check is the maximum loop impedance from the B40 in the house out to the workshop. If this is greater than 1.15 ohm does this mean that the B40 would not trip and thus be unsafe ? Is my understanding correct ? To get...

Hi Securespark I was wondering if you could give me your opinion on my earlier posting "Question on MCB Loading". Cheers

Flameport Just to clarify the 40A MCB in the house consumer unit which feeds the workshop is a Type B MCB and not a Type C.

The workshop is supplied, I believe, via a 6 sq.mm SWA cable which runs under the ground from the house to the workshop. I would estimate that the cable from the house consumer unit to the workshop consumer unit is approx. 30m. All the other breakers will be MK Sentry Type B MCBs. There...

Hi Thanks for all your feedback. 1. The workshop is 7.1m x 7.1m x 2.5m tall. The 6kW requirement came from a heat loss calculation which I ran. 2. I don't think that compressor has a soft start - it will have a Type C MCB in the consumer unit to prevent a localised trip in the workshop...

Hi We have a workshop which is being supplied from the house via a 40A Type B MCB. In the workshop we have a dedicated consumer unit. In the workshop we have 2 x 3kw fan heaters to be controlled via a room stat / contactor ( relay ). We also have a 3kW vented water heater and a 3hp (...

We have been working on the house for several years now and when we started it was wired in accordnace with the 16th Edition. Am I correct to say that the 47A cable has to be derated to 35A in accorance with Installation Method 15 for Table 4D5A ? The ambient temperature will not exceed 30...

Hi Sparks Thanks for your quick answer. In my case I happen to have a 6 sq.mm cable supplying an induction hob. The dedicated circuit is protected by a 32A MK Type B MCB. The PVC T+E cable runs is clipped in the centre of timber ceiling joists and is covered with mineral wool insualtion...

Hi One other question - the ccc of a cable, are the values listed in the Installation Methods in the 16th and 17th Edition based on a continuous use i.e. 24 hrs a day ?

cheers :D

Under the 16th Edition in Table 4D5A Installation Method 15 ( installed directly in an insulated wall ) a 6 sq.mm cable was rated at 35A. Do you happen to know was this based on the cable touching the inner wall ?