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Hi folks, I’m looking for some of your experiences with excess loading and services fuses here. I have set up a temporary site supply for a large office site using an existing supply from what used to be a house on part of the site (now all one building) The supply was installed in the 1930’s...

Hi all, I have got a site (old offices) with about 500 lines coming in on various different cables, mostly underground and along the front of the building and some overhead some fiber lines also.. Only one pair is in use for the site office, but I’m not sure which cable this is on. It’s a...

Hi, I know this a DIY forum but maybe someone here can help with a metering issue… I have an 11kV supply to a building which is fed from a HV substation nearby. The DNO meter for the supply to the building is outside the substation in a cabinet and meters the 11KV output from a transformer...

Hi, all, I’m looking for opinions on earthing arrangements for a project I’m involved with. The site is 60m by 60m and will involve ten houses and flats. The supply is at the site boundary and is a Bemco Board with metering for each property with a 25mm SWA 3 core to each via a switchfuse...

Found this the other day on a job I was looking at. The tails were connected to a modern RCD CU but there was no earth connected :shock: Wired by a professional plasterer :roll:

I have a 7 year old Worcester Bosch Greenstar Heatslave 18/25 oil combi boiler. I have a reoccurring problem every few days with the flow switch sticking in the open position and causing the boiler run in HW mode and eventually cut out on the overheat thermostat. The water at the taps is then...

Hi, Can anyone recommend an external PIR to switch around 300watts of lighting? I am looking for a good quality unit with adjustable sensitivity as well as the usual daylight and time adjustment. The current PIR I have is from Screwfix http://www.screwfix.com/p/180-standalone-pir/36316...

Went to a look at a job as no heating and water. Leaking TRV had caused pressure drop so nice easy fix. However the boiler pressure was 0. No fault codes but the pump was continuously running. display showed 'c' for heating mode and burner was off. Fortunately the pump seems ok, and...

I do a lot of basic boiler repairs within my property maintenance work, but as I am not an RGI, I use British Gas one off repair for repairs I can’t legally do. I had a boiler which made a metallic screeching sound and then the fan stopped and it cut out. I therefore assumed a failed fan and...

I have some all electric flats I manage. The hot water is from a direct combination cylinder (400x1050) with a single immersion. Although the cylinders are mounted on a shelf in a cupboard in each flat, there is only about 1m head. The taps are mixer type and it takes ages to fill a bath...

I’m working on a 1950s ex-council flat with ten year old storage heaters. The total load off-peak is 70amps. The flat is at the end of the street and I guess furthest from the substation. The voltage is 235v but when the off-peak load switches on at midnight the voltage drops to 212v and...

Hi, I did a Ze test on a TT installation and got 24 ohms and a PFC of 10 amps at the rod. In theory if I removed the RCD and put a link from say a 32amp MCB to the earth bar in the CU with the bonding and other circuits disconnected, would a current of around 10 amps flow continuously to...

I have a Worcester Bosch, Greenstar Heatslave 18/25 oil combi boiler. It is around 6 years old. So far it has had 4 new flowswitches! They seem to eventually stick open causing the boiler to think there is a HW demand and then the overheat stat operates. It is a soft water area; there is...

Hi, I am working on a 1920’s property where a conifer tree has been panted about half a meter from the front window (between front window and front door). I’m guessing it’s about 20 years old (4 m high) and will be cut down as it’s blocking all light. I believe the roots have caused the...

I have a block of flats I manage with newish electronic economy 7 meters. There are 2 tails from the meter, one for day and one for night. These feed separate boards with combined neutral. One for lighting and power and one for storage heaters and immersion. The night output is dead during...

Hi, I have a Ravenheat Csi85t combi (yes I know it’s a cheap one and not the best make) It runs for 30 seconds to a minute and then goes to flame fail lockout although the flame doesn’t actually appear to fail before the lockout occurs, you can hear a relay click then the continuous fault...

Hi, I have a Worcester Bosch Heatslave 18/25 oil combi. 5 years old, serviced annually. All appears fine but it sometimes goes to lockout when the heating is on. Its the 'boiler lockout' that trips not the flue or burner one so the lockout light doesn't come on. The burner just...

Hi all, I have a Worcester greenstar heatslave 18/25 oil combi boiler that’s three years old, serviced last year. First problem is that recently I have noticed the radiators are sometimes getting very hot, way too hot to touch and hotter than usual, thermostats all ok and I can’t see any...