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can anyone tell me which is the right correction/derating factor to apply to an SWA buried in the ground, in a duct at a depth of between 0.5-0.7 metres. Overhead protection is required. I keep coming across a figure of 0.9 I am aware that there are others for temperature and soil resistivity...

Are there any heating engineers on this forum who deal with solid fuel, I have a query if there are? Is there anything set in stone that states that you must use a normally open valve, if you use one to shut off a cylinder when it is satisfied on a gravity hot water circuit? The guy who fitted...

Someone asked me the other day if i knew why one of there LED downlighters glows dimly when switched off. I did not dismantle anything to have a look as i was too busy, but said i would try and find an explanation for them. There is six downlights in total, switched from three locations but...

Why can`t i download?

Hi all, when it comes to imperial cable, is there a preferred way to record it in the csa column on your paperwork. I.E. do you actually put the number of cores along with the diameter in both the line and cpc columns or do you find the nearest csa equivelent. Thank`s in advance for those who...

I have seen many a post asking if it is acceptable to use a single MEB conductor for all services providing it is unbroken. My question is: Is there a regulation that prohibits the use of a single conductor for earthing and bonding of a TT installation providing it is unbroken?

Hi Apache, looking for advice if you would be so kind. I got in from work not too long ago and there were the dried remains of bile in four areas on the floor. I let my dog out and she had a very smelly, loose/watery poo, but there was a little bit of blood in it. I then walked the dog and she...

Hi all i was on a job today, domestic dwelling. TN-C-S supply. Inside the meter box before the consumer unit i noticed a double pole isolator, however only the line conductor was passing through the isolator. The isolator was all sealed. Surely this does not comply with 537.1.4

Hi all, investigating a high Zs, so I measured Ze on a PME system and got a reading of 0.53Ω I contacted the DNO who informed me that they would accept a value of up to 0.8Ω, I repeated that it was a PME and they said that it did not matter. Anyone had a similar conversation with them?

Hi all, does anyone have the time current characteristics for the following fuse as i could not see it in the BRB. Henley ISCO BS88/1939 60 Amp Cat: DC3 List No:3098 Thank`s in advance for any replies

Hi all, trying to connect a car radio cassette. Pioneer KE-373OB with the following coloured cables on the back of the cassette holder: Red with a fuse on Blue Blacks x2 The speaker cables are seperate and obvious Tried searching the net for a manual to no avail. Think its quite old. I...

There are two circuits in a bathroom. One for the lighting and one for a combi boiler. The lighting circuit has no cpc and the circuit is protected by an mcb 6 amp B type 60898. The boiler circuit has a cpc and is protected by way of an 30 m/A RCD FCU. Zs for this circuit is well within spec...

Hi all, just wondering if anyone can identify a fuse for me, so that i can perform the adiabatic equation. It is a main service cartridge fuse, filled with purple sand/silica or whatever it is. The rating was there originally but most of it has rubbed off so it was illegible Many thank`s

Hi all, could someone remind me what the instantaneous tripping current for semi-enclosed 3036 fuses is. (How many times their rating?). I can`t remember where i seen it. Also on page 283 of the NICEIC Domestic periodic Inspection, Testing and Reporting, it states that it is the 5 second...

Gas is bonded with 10mm csa

I will be moving home in the not too distant future and will probably want to re-wire the place as the existing electrical installation is far from adequate for todays needs. It may not all happen at once but i was thinking of running in the cables to various locations in order to utilise them...

Hi all, can someone tell me where you connect the return from a pipe stat, into a y plan wiring centre, does it go in with the white of the mid position valve or can it go directly in with the boiler live? Y plan virgin so just trying to get a head start before i get there. Thank`s in advance...

After calculating for diversity it equates to 17 amps. This is a cooker circuit, wired in 6mm

Hi all, trying to get up to speed on central heating wiring centre`s. Looking at a SALUS diagram it shows terminals 12-boiler live, 13-pump live and 14-call from the cylinder stat all linked together in the wiring centre. My question is: if it is a y plan fully pumped system with a pump not...

I have been asked to install a new ring main and lighting in someones kitchen, which is getting a re-fit. All legit and above board through building control etc. I do not want to accept responsibility for the existing installation circuits, that have been worked upon by the home owner. My...