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I should have probably described the 1st option as 'radial'. In effect both options are types of 'Parallel' going by what is taught at school, since live and neutral are connected to each device. I doubt that text book 'Series' is ever used in real life. Anyway, what I want to know is should the...

From the ceiling rose, the cable will be 2 core + earth. Series option: Between each alarm will be 3 core + earth. Junction box option: Between common junction box and alarms will be 3 core + earth. The 3rd core will be for hard wiring the signal. I have seen the series way being used before...

Hello. I am upgrading some AICO smoke alarms in a HMO where the existing alarms will expire soon. They are each wired from individual ceiling lights. On the top floor there are 4 alarms. I plan to go into the loft and from above, power the 4 top floor alarms from a single ceiling rose, instead...

Thanks for the replies. Since it is well ventilated and there is no water source in the loft (no tank or humidity source that I know of) I didn't think that it could be caused by condensation on the vent. I am planning to block it with a thick plastic bag stuffed with a rag. I think that...

I have 2 plastic vent tiles on my roof. From within the loft, I see that their underneath interface is a 75 mm diameter pipe, presumably to allow connectors, or just to allow ventilation. One of them is directly above the loft hatch which is lined with polystyrene on top. The other one is above...

Just for the record, I installed the meter device and clamp, so it monitors electricity consumption on the circuit supplying the shower. So far it seems to work well. I had to install it in a slot where there was no busbar terminal in the way. It is powered from the lighting MCB. Thanks to...

Thanks again for all of the good advice. I think that I will buy the meter device with the clamp. Would it be acceptable to wire it up as shown in the attached photo? Ie. feed a new live wire from a lighting circuit breaker. Then connect the neutral connection to a neutral block in the consumer...

Thanks for all of the helpful advice. I wanted to install the monitoring device just to conveniently monitor usage for an electric shower, following a large electricity bill. After reading the advice, I plan to leave the consumer unit alone and instead install a monitoring device on the cable...

I want to monitor how much energy our electric shower is using. The shower is currently on a Hager MTN132 B32 MCB. I assume that this Hager MTN132 B32 MCB goes on to a busbar and has a single live wire connection at the top. On Amazon and eBay, I have seen MCB's that have WIFI functionality...

Yes, Sellotape solves many problems. We have some on our freezer power socket switch after it has been turned off a few times. Regarding the 2 gang light switch originally mentioned on this posting, I have successfully replaced it with a 2 gang switch where one switch is key operated. So far it...

The 2 gang switch was installed many years ago and the house has been fully tested by an electrician in recent years. I just want to swap around an existing light switch. I understand that can be done by a DIYer who is competent.

Sorry, I should have explained that I did not ask any electrician about this. I just wanted to know if I could swap around an existing 2 gang switch with a new one that replaced one of the switches with a key operated switch. Thanks for your advice.

Thanks, it is reassuring to know that they have been used like this elsewhere. It is for use in a shared house of 4 people, so it is difficult for me to ensure that the power is always on, because people turn off the switches in an attempt to turn off other internal lights. I don't want to...

I have an outdoor security light with a PIR sensor. I want the unit to have permanent power. It is switched from a 2 gang light inside the house on a one way circuit. One switch is for the kitchen internal light. The other switch is for the outdoor security light. People are in the habit of...

Hi. I have a problem with my valves letting by and this looks like a good solution. Just to be sure that I understand your instructions, do you mean to install a new standard combi straight filling loop such as this one https://www.screwfix.com/p/combi-straight-filling-loop/46605 but remove the...

I have a Vaillant ecoTEC plus 831, installed in 2010. I have a problem with both valves at either end of my internal filling loop letting by on this boiler. I think that capping off both valves will be the most simple solution. I think that the mains supply side requires a 1/2" cap. But I am not...

Thanks for the clear answer. So I understand that adding another RCD is possible, but not the best solution. Many thanks. I wasn't expecting such fast and good answers to this old thread! :)

Just some more background to my case (not the original poster), the reason for suggesting adding a RCD was to protect some existing lights and extraction fans in bath and shower-rooms around the house. I'm quite sure that these lights and fans were fitted when the house was built around the year...

Many thanks for the excellent answers and helpful photos. Please see the photo of my existing consumer unit. It seems to only have one busbar, so I can conclude that fitting 2 RCD's is impossible on this board? However it has been cut in 3 places, so it is in 4 pieces. 2017-10-14 16.01.38 by...

I'd like to know if another RCD can be added to this consumer unit. There is already one at the far right. Could one go in the gap towards the left too?