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i have a boiler that when you run the HW will light and then immediately the flame will go out, then light again, and go out immediately, it does this about five or six times and then runs continuously. what's wrong with it? is it the flame detector?

in addition to an un-vented storage tank to supply your hot water, you may want to split your heating in to two or even three separate zones, a day zone for the living areas, a night zone for the bedrooms, and a zone for the spare guest room. This allows you to install separate...

I agree, you need to re-pressurise the EV to 1 bar

Can anyone please explain the advantages and disadvantages of the different protocols for the fire alarm systems. What is and "Open" or a "closed" Protocol?

I am installing a sounder (98db@1m) outside a room 0.6m from the door to the room. I need to calculate the db at the bedhead in the room, 4 to 5 meters from the door. Can anyone please help?

Found a reclaimed drum from a local repair shop. The drum was out of an Electra AWM 1000, but is essentially same as the AWM 800 except that I had to swap over all the sensors etc. Machine up and running now, but still checking for any leaks. Very many thanks to Fido and the forum for...

Found an article of clothing stuck inside the washing machine. On inspection found a dented and cracked inner drum where the cloth was stuck. It appears as if something became wedged between the two drums while the drums were in motion and has managed to dent the inner drum(& may be the outer...

Could you professionals in the field please advise which is the best panel which will accept wireless PIR detectors. Best in terms of reliability, immunity to false alarms, ease of setting/unsetting i.e. key fobs/remote set/unset etc and life of detector batteries. Any help and guidance...

You will need to run cat 5 separately. Normal cat 5 cable has to be run seperately from all other services otherwise the transmission rate becomes degraded. You can get double shielded cat 5 cable on which you can Earth the outer shield, for noisy enviroments.

What advice is it that you require? What is the rating of the shower and the length of the supply cable?

A breaker for a circuit is rated for the design current that the Load will draw. The cable is then chosen that would safely deliver the current which will trip the breaker. So if the Oven draws a maximum of 19A then the breaker at the CU supplying the Oven must not be 32A but a 20A breaker...

You need an earth rod and the CPC so that if an appliance develops a fault and the chassis of the appliance will becomes live, the CPC carries the fault current to earth via the rod and hence trips the RCD. If you had no rod, then no earth path and the RCD would only trip when someone touched...

I thought it was understood that it means a working voltage of 250V AC, its not a DC working voltage of 400V. It has to be non-polarised capacitor for working at the mains voltage.

Connect a 1.0 Microfarad 250V AC Capacitor across the L & N at the 2D terminals.

There are two reasons for connecting the two appliances seperatly:- 1. Isolation of each seperatly 2. The Flex for any appliance is only rated for the load of that appliance so for the double oven the flex is only rated at 19A. You can not connect this cable to a circuit which...

The Hob load Before diversity is :- 6600/230=28.7A After Diversity:- 10+1/3*18.7=16.3A The double oven load before diversity is:- 4400/230=19.1A After diversity:- 10+1/3*9.1=13.0A Total load is 16.3+13.0=29.3A So your breaker is rated correctly at 32A. Idealy you require two...

Its possible for a hum to be heard from the CU, but most of the time it is inaudible. This happens due to the magnetic effect created by the High currents passing through the conductors interacting with magnetic field of other conductors in the close vicinity and the earths magnetic...

Can anyone help me with a copy of the manual, or point me to a web site where I can download it from. Many thanks.

A total possible load of 7500watts. A possible total run of 10m to the loads. 4mm2 SWA will have Volt Drop of 5.57V, well within 9.2v Total current is 32.6A @ 7.5Kw, max rating of 4mm2 SWA is 41A. I would install 3core 4mm2 SWA( Phase+Neutral+1 for earth). install a 4-6way split...

haa soooo so soryyyy