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Hi All, Measured the diameter of the fuse wire, It was 1.10mm. the nearest size (shown in table 53A of the wiring regs - these figures also tie up with RMS's figures) is 45A equal to 1.25mm diameter. I assume they did not make 40A fusewire (not shown in table 53A) and that there must be an...

Hi RF lighting, No need to be sorry, You have helped educate me. No I can not see anything in Table 41B2 regarding BS3871 in the Brown version of the regs. However Guidance Notes 3 (the latest version) covers this in Table 2D part (11) on page 114. Silly me I am definitely loosing It...

Hi RF Lighting, My Regs are coloured Brown. Bs7671:2001 incorporating Amendments No 1:2002 and No 2:2004. Table 41B2 is on page 46 but part (f) definitely says Type C circuit breakers to BS EN 60898 and RCBO's to BS EN 61009. which version/colour of the regs do you hold? Thank you for...

Hi RMS, On recollection, the fuse wie was definately thicker than 30A fusewire (visual comparism, did not have a vernier micrometer handy). I think it may have been approximately 1.5mm thick. I am also fairly green to Periodic inspections within the domestic environment. Must be jinxed...

hi RMS, Thank you very much, will check diameter next couple of days. Do you know if the service fuse was commonly supplied in 60A, 80A and 100A in rewirable format? Kind regards Harry

Hi Fireman22, Generally the main switch is BS EN 60947-3 but the main switch in the Poteus CU is definately BS5419:1977 (looks like a predecessor to the 60947-3). hi spark123, Yes I think you are right the M^ must be the breking capacity for the mcb's. However the main switch did not...

Hi RF Lighting, Thank you for your response. Thank you. However, the rating was nowhere to be seen. The fusewire looked thicker than normal 30A wire we normally use. Does fusewire come rated to 63A? Regarding the short circuit capacity. I was expecting the short circuit capacity of the...

Hi spark123, Thank you for your response. The table 2D in the back of the guidance notes 3 does show mcb's type 1/2 and 3. It mentions this table is to be used when the overcurrent protective device is an mcb to BS 3871. Are all type 1 2 and 3 mcb's always to BS3871? the mcb's in the...

Hi, I would be grateful if anyone could advice me on the following. When carrying out a PIR, I found a Proteus Consumer unit. The Main Switch was 100A BS5419:1977 240V/415V AC22. The MCB's were Type 2 M6. Also the Mains supply fuse was a rewirable type, it was housed in a metallic...

Hi Croydoncorgi, Did try giving the valve assy a sharp tap but it did no good. When the old valve came off it did have a lot of debris in it. kind regards Harry

Went back to boiler (access know provided). Checked Inlet pressure 20.5mb. Checked Burner Pressure 0mb. 230V at coil, coil resistance 5.5KOhms. Changed gas valve and boiler operates correctly (much easier when access available). Thank you to all for help, information and advice. Kind...

Tony thanks for you answer, most helpful as always. I did try to google Honeywell gas valves but it did not throw up anything regarding data sheets or how they classify the valves. Maybe Chris will come back with more information. He, like you, is a minefield of information. Kind...

Hi Tony, Makes sense what you say. But I think I will find that the gas supply is OK as the permanent pilot is on and the house is not rented but occupied by the Landlord. I think the problem will be in the combustion chamber area. Apparently the problem only occurred after the freak rain...

Hi Paul, If the valve is only £25 or so you are right it would be false economy to mess around with it (however, when searching the net the price varies considerably). I will take a spare with me. I think the valve may be OK so will cary out normal checks (before considering replacement) such...

Hi Tony, haven't done too many tests at moment due to access. Will check everything (inlet/outlet gas pressures etc when working access is provided). Got a back ache just trying to do what I have done so far. Kind Regards Harry

With regard to tony's question about measuring current in the mains. I think he's looking for that the ammeter needs to be put in series and not in parallel as for Voltage measurement. Another way would be to use a current transformer (clamp meter). Harry

Hi Tony, The boiler is a Thorn M54 balanced flue floor standing boiler. The issue is pilot is on but main burner does not fire up. Checked demand signal is getting to the solenoid (230 present at Solenoid terminals). Checked coil resistance this was 5.2K Ohms, originally thought this reading...

Thanks ChrisR, I was getting a 5.2k reading and thought it was too high. seams like the gas valve is ok and the demand signal is ok. Need to investigate further - very difficult to access. Many thanks Harry

Hi, Does anyone know what the solenoid resistance should be for the v4600c 1029 Honeywell Gas Valve. Have power to solenoid but boiler not firing up. Multimeter playing up so could not read resistance (definitely over 2000 Ohms). Will go back with Fluke to check the resistance but would like...

Hi doitall, When I first went to see the boiler the customer had put planks of wood all around the flue (about a foot away). I moved these and told him not to cause any obstructions that may cause vitiation. The flue does look clear in general but in the top outer section (air inlet) they...