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Hi, Could someone please confirm that I am thinking along the right lines with this. (Ive never worked on a TT system) Just as an example........Say I install a circuit on a TT system. The Ze reading is 16 ohms  The R1 + R2 reading is 0.25 ohms. So if i calculated the Zs, it would be 16.25...

Hello all, This is just a query I was thinking about, & not an actual installation. If i was going to install a new consumer unit in a domestic installation, a way to minimise the inconvenience of possible nuisance tripping could be to use RCBO`s instead of using a split board with 2...

Hi all, Ive just done an electrical inspection & test on my own house. Ive not had any problems with the electrics over the past 3 years that i`ve lived here. I`ve done it, mainly to get some testing practice, also just to see if it complies with the current regs. The consumer unit has a...

Hello,  Ive got a query regarding the schedule of tests sheet in the green OSG. In the top left corner, it has a box that says "Zs at DB".  Is this asking for for a Ze figure ? The red OSG used to say something like "Ze at origin" Just a bit confused as to what it requires, as all the...

Hello all, My sister is in the process of buying a newly refurbished house & ive just been down to have a look around with her. The house has been fully rewired, everything has been finished quite well, theres just the gas hob & electric oven to install. I had a look at some of the...

Hi all, Im just looking for your thoughts & experiences with Schneider consumer units & MCB`s. Ive used MK C.U`s recently & wasnt too impressed. Plus, the product recall has put me off them a little. My local Toolstation had the Schneider C.U`s on display today at resonable...

Hello, Just wondered if anyone could have a look at this rough wiring diagram ive done & let me know if it would work ok. Im working as an electricians mate for a different firm this week. Im not very familiar with emergency lighting or PIRs & my supervisor isnt very good at explaining...

Just picked up a right bargain at a police auction. Metrel MI3000 tester with all the test probes & leads etc,

Hi all, Got another written assignment to do for college & have a few querys. The instruction sheets says : "For a two bedroom terraced house, Install a 300W exterior light with PIR sensor at approx 3.5 metres high, above kitchen window. The client has just had the house decorated...

Well............ unfortunately, as of next week im unemployed. Not much work on, so they`ve had to let a few of us go. So, if anyone needs a hand in the Yorkshire region, im available & willing to travel. I`ve spent the past 12 months working as an electricians mate whilst attending...

Hi all, Am I right in thinking that when installing wiring in steel conduit, there is no need to run an earth wire along side the line & neutral. So... If I was installing lighting, would I just terminate the supply earth at the start point of the conduit... then connect an earth wire...

Can anyone recommend the cheapest place to buy the 17th regs book ? Ive seen a few places selling it for 60 quid, (amazon, waterstones, etc). Hoping to find somewhere thats got a sale on. Cheers Guinness

Could someone have a look at this wiring diagram for me & confirm it would work ok. Its for an intermediate lighting circuit, wired in conduit & using single cables. Cheers.

hi all, Ive been doing quite a bit of testing lately, at college & work. Its all starting to sink in, but the one thing im unsure about is the R2 result. On one of the ring circuits the results were: r1 = 0.08 rN = 0.08 r2 = 0.12 R1 + R2 = 0.05 R2 = ? Would the R2 result be the same...

Hi all, Im currently studying at college & trying to get some practice whilst at home. Ive got a practice board on my cellar wall & have been wiring various lighting & power circuits. I now want to test these circuits for continuity, insulation resistance etc. What sort of...

hello all, Ive just read through an asignment that I have to do for college. It says "draw a wiring diagram & then install a 2 way lighting circuit using a 6 terminal junction box". Im familiar with this type of circuit, but I have always used a 4 terminal JB. Is there a particular...

Hi all, Just got a quick question regarding adding extra sockets to an existing ring. Im currently training at college whilst working on new build sites, so my domestic knowledge isnt great. In my house I have 1 ring upstairs, for all the sockets in the 2 bedrooms. I would like to add an...

Hello all, Does anyone know where I could find some decent wiring diagrams for the junction box method of one-way, two-way & intermediate light switching. Ive got lots of info from college for the loop-in ceiling rose method which im familiar with, but dont have any diagrams for using...

Hi, Can anyone help me with this question? When I try to work it out, I always end up with a different answer to the book. To vary the speed of a d.c. series motor it is usual to connect a diverter resistor in parallel with the field winding. The field of a series motor has a resistance of...

Hello all, Im due to take my c&g 2330 201 exam soon. Could anyone tell me what score is required to pass the multi choice exams, ie 95% or above, or does each exam vary ? Cheers