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thanks Noz, Theory, Chris and Special, some very good advice, I plan to check wiring especially at the boiler (referencing the manual) I will then check out the programmer and both stats and then move on to valves if all is well, thank you all for the input, I appreciate your help (MEERKAT)

cheers Matty, sombody did mention that was possible, but if the problem was with the motor or microswitch then it would destroy the replaced items anyway, so best to change valve completely, thanks anyway (MEERKAT) ---------- Post Auto-Merged at 19:20 ---------- Previous post was made at 19:18...

thanks Doc, and theory, logical approach to the diagnoses is, customer has a leak at the boiler calls out a plumber, plumber replaces a potterton boiler, with a Baxi boiler, he also replaces the PCB, I presume he must have damaged it or it just gave up the ghost, plumber leaves, a few months...

Hi, fault on a Potterton S plan sytem, the HW and CH circuits are both on continually, I havent actually seen the job yet, my thoughts are: one or both motorised valves stuck open, or wiring fault between room stat and CH valve and or wiring fault between Cylinder Stat and HW Valve, or...

Hi Manator, would the 3.83 max Zs reading then be multiplied by 0.8 to account for the thermal increase under fault conditions, cheers (MEERKAT)

Hi Sellers, try O.S.G page 103, table 2D, what size and type of breaker you looking at? (MEERKAT)

yep, I have received everything you've sent, I have done both 302/303 a couple of weeks ago, if you need any advice send me a (PM) private message, bye for now, (MEERKAT)

Hi ya Moggy, I have just finished my write ups for both 302/303 and yes basically same stuff for both, I dont sit mine till june, how come you have done yours and have yet to do the paperwork, I thought it was all to be done in the 4 hours of each assessment? Have a look in the download area...

Hi Moggy, 303 is a PIR, just looked at the recommended codes for a PIR and reverse polarity is a code 1, good luck mate, (MEERKAT)

Hi Moggy, Ring final circuit test in 3 parts (1) End 2 End, r1 0.02, rn 0.02, r2 0.03, (2) Figure 8, L/N, you will get a reading equal to (r1 0.02) + (rn 0.02) /4 = 0.01ish (3) Figure 8, L/E, You will get an open circuit with your probes in the L and E of the R1/R2 Box fitted to the socket...

Hi Matty, I make it Ib = P/V = 4500/230 = 19.56 Amps In = MCB (B) 20 Amp Ref Method = D (buried) Correction Factors = Cc 0.9 (Buried cable) It = In/CF's = 20/0.9 = 22.22 Amps Iz = table 4E4A 6mm = 53 Amps, (6mm cable reqd due to Volt drop) Fault protection formula = Ib is less or equal...

cheers Barx, I managed to download the manual, but thanks for the other info, good advice mate, (MEERKAT) :)

Hi all, anyone know the factory reset code for a Veritas 8c alarm panel, cheers (MEERKAT)

No mate you want the NICEIC book, "inspection,testing and certification" this has a Consumer unit diagram on the front of it, good luck, (MEERKAT) :)

Hi Paul, I am just finishing the 2330 this july (3yr cse) and I have the 2392 qualification aswell, I am 49 years old and retraining as I retire from the fire service in 2012. Its a difficult call wether to do the 2391 or the 2392, I wouldnt put myself through the 2391 to do pat testing alone...

Hi Chris, thanks for your help I do now understand how this works and I am keen to learn how all the smaller pieces fit into the bigger picture, thanks to you, steptoe, Special location and PC electrics for your input, cheers (MEERKAT) :)

Hi Plumber, this is what I was trying to say in my original answer to soulman's post, so diversity only affects the load, diversity is only used when considering a group of circuits as found in a CU, where not all of the capacity of every circuit is being used, therefore we wouldnt reduce the...

Hi Plumber, well not sure I understand any of this anymore, using the circuit in soulman's post is special saying that we could reduce the C/C/C by a third using diversity, or can diversity only be used in a commercial/industrial environment? cheers for your help (MEERKAT) :)

Hi SL, I was told at college that the only single circuit where diversity played a part was the cooker circuit, I thank you for your input and would like to understand more about this subject. Using the lighting circuit in soulman's post, is it feasable to reduce the C/C/C of the cable by 33%...

Hi PC Electrics, I think this is a single circuit cable calculation only, no diversity involved. In a consumer unit where there are several circuits, the main supply cable and its protective device are calculated using Maximum demand and diversity, using the tables found in Appendix 1 of the...