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yeah they are a pain to wire! the ones I had were also quite deep so if you have shallow boxes, you may want to look elsewhere. I would go for one dimmer and one straight on/off Lorraine

Hi Everyone, the pressure is governed only by the height of the water column, the higher you make it the more pressure you get. P = 998 x 9.81 x h (in meters) the flow rate is a function of the pipe bore, so if you make this bigger you will get a larger flow rate but this is limited by...

Hi everyone thanks for all the replies and compliments :oops: I am a bit irritated to be honest as I thought i could just do weekend jobs to start off with but as this plumbing course doesn't seem recognized i shall endeavour to get an NVQ 2. as for the comments about Corgi / Argi. My...

Hi, yes the water pressure is: Pressure = 998 x 9.81 x h where h is the difference in height between your cold water tank and the outlet of the shower. the pressure will be calculated in pascals, just divide by 100000, and that will give you it in bar. (as 1 bar =10^5 pascals) Lorraine

Hi Everyone I believe the total thermal resistance does take into account the resitance of the fins. On the non fin side you've simply got kdT/dx where x is the thickness of the metal, and k is thermal conductivity, area is constant throughout on the finned side you've got kdT/dx then...

Hi I was going to suggest a henley block, that way should you ever decide you can always add a second consumer unit. Lorraine

Hi, I think they should quote the values in terms of thermal resistances because the heat generated is a function of the thermal resistance, temperature difference and area of the radiator: heat out = area x U value x temp difference I believe its more efficient from a total energy...

does that mean any tom dick or harry can become a plumber without having done the city and guilds? for example say they previously were a mechanical engineer or something, I imagine they would have done the fluid mechanics and thermal stuff to a greater depth than a C&G qualified plumber?

Hi Everyone I have enrolled to do a plumbing course at my local technical college and as I work during the day, I was given the opportunity to do a city and guilds plumbing technical certificate 2 for two nights a week?!? does anyone know if that qualification is recognized or not? I had a...

Having put a bit more thought into it, I would say you are correct the flow beyond the trap would be whats known as a "slug", running down the sides of the pipe. This follows on to what you said, the plug/trap has the smallest cross sectional area of the entire length of the pipework. So I...

hi, atmospheric pressure does have a part but when the height differential is so small it makes very little difference. Just a point worth noting as I see some people have stated that the atmospheric pressure pushes down on the bath water - this is true. but it should also be noted that...

okay, i'll have a go. note this is a bit untrue but should suffice - the speed at which you drain at is proportional to the square root of height of the water column. (Unpumped). So as the water level drops, the flow rate will also fall. (that doesn't necessarily mean the height of the...

golf mk4, a popular car. changing a headlight bulb not the headlight invovles taking hte bumper off! ________________________________ please note 17

this is actually bernoulli's equation. as mentioned by a previous poster rho x gravity x h = pressure at the bottom of the pipe (you need to define a reference point) the other element is the flow rate which is 1/2 rho x V^2 which is actually dynamic pressure but you can use this to...

Crikey they must want to bend you over backwards and spank you very hard. My LABC adopted the same tactics as yous albeit I only had to pay £90, I sent them a polite fax with a note from the ODPM website and low and behold 30 mins later they agree to come round to test out my electrics...

Hi Everyone Apologies for hijacking the thread. going back on topic :D If you've checked for neutral and live on circuits and the current through both is almost the same, how can there be an earth leak? Going by logic I would say in my total numptyness that the most likely place for an...

Hi Everyone On the subject of fuses my meter (well the bit before it) actually had 2 service fuses, both 60A each. WHen I changed the Consumer unit i pulled both of them out just to be safe but I thought they were only supposed to be on the live (phase)? Lorraine

hi everyone, i would have thought the wire in the socket in the partition which you knocked through had popped out. open it up and have a look. just make sure you SWITCH OFF at the CU /Fusebox before you do that. BTW do you have rings in Ireland? from what you describe it sounds like a...

Hi everyone, This might be a bit of a numpty suggeestion but are you sure you haven't got a leak to earth? I would stick each circuit on the rcd side of the CU one by one and check?!? Lorraine

Hi waynes I'm not a spark but here's what i was advised: 32A ring for your sockets, moving and adding shouldn't be too much of a problem, must be rcd protected if it can be used for powering an outside appliance. 45A cooker on a radial. needs an isolation switch - don't connect to rcd...