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BAS: You might like to know they are selling another one of the type I got - see item 5980087852 on eBay (finishes tomorrow afternoon). There's a link on there to a calculator for room-size (and type of room) to find the kW of cooling needed. Beware that the auction doesn't include any...

The cables do have plastic insulation on them - the lamps screw onto the cables, piercing the insulation and contacting the conductor. Cheers, Howard

Well since they have the pipework pre-made, it may be something to do with that. I don't know about the refrigeration pipes, but on mine the condensation drain needs to run downhill all the way, because it's not pumped. That may be an issue on the B&Q ones. I'm not sure this is a good idea...

I had a look at a number of them for sale on eBay, checked the specs on manufacturers' web sites, and also had a look at the ones that B&Q warehouse (sorry!) are selling. It's made by Hitachi (model numbers RAS-25HY4 / RAC-25HY4 for the indoor/outdoor units respectively) and the features I...

It's not 1.5mm², it's specified at 1.6mm diameter (yes, really!). The unit is made by Hitachi, but I'm not sure where. It comes with instructions in six European languages, including English. They all specify the same cable spec between the units, and specs. for the cable feeding it by length...

I want to put in a new circuit (let's take Part P as read) to supply a new split Airconditioning unit in my bedroom, and sockets in the loft. The Aircon has an indoor unit high on the wall of the room, and an outside unit on a stand on the ground outside. I presume because of the latter...

FWL: I think I can see a misunderstanding here! You are describing a twin immersion heater unit, I believe Has is talking about one that has indirect heating by a boiler, and one immersion heater! If so, the "stat" he is talking about is the one that controls the boiler, not the immersion...

Mike, Are you saying that you can direct-bury 16mm² earth cable? If not, what extra protection would be needed - would flexible plastic conduit be enough, or would it need something like this: http://www.tlc-direct.co.uk/Products/KX20.html Cheers, Howard

That's a pretty big "otherwise"! ("Apart from that, Mrs.Lincoln, what did you think of the play?") :? Since you said the MCB is 5A I assume it's a plug-in replacement for a rewireable fuse. If it's a Wylex CU, beware that the incoming live terminal (not disconnected by the main switch) is...

As I understand it they are different: an RCCB works on the balance of current between L & N, while an ELCB actually measured the Earth conductor and tripped when it was energised, so a short to a "natural" Earth like a water pipe wouldn't trip it. But I could be wrong! Cheers, Howard

Given that it's SWA, doesn't the short to the armour trip the MCB supplying it? Cheers, Howard

Ah, got it now - I was thinking of a N-E fault upstream of the CU, for some reason. However, isn't this a tad overcautious, given that an MCB or fuse would have precisely the same situation anyway? Or are we trying to protect against a disconnected N that is shorted to E and the Earth...

Hang on though - if the RCBO has disconnected the Live, where does the current come from to trip the time-delay RCD? Also, if there are several RCBOs on the same Neutral bus, wouldn't a N-E fault trip all of them? Cheers, Howard

A 13A fuse in the plug! 2A and 5A plugtops don't have fuses, so you're relying on whatever is in the CU to protect it. Consequently, in my opinion, if you have 2A lighting sockets they should be fed from a 2A MCB. Cheers, Howard

Do you prefer a single or double bow when making connections? :) Cheers, Howard

A number of years ago my house had a cable that ran from the kitchen to the shed (ten feet away) then on to the garage at the bottom of the garden. It was mostly in ordinary T&E, clipped to the garden wall (I didn't do it!) and there was a plug on a flex in the kitchen to plug it in when...

I'm no expert, so consider my input as suggestions to think about, not solid recommendations... It's a shame you can't get 6A RCBOs (at least I can't find any), or you could just swap them in for the lighting MCBs To save swapping the whole CU, what about installing a small extra CU, fed...

By definition, there is nothing to stop someone plugging a 13A load into each socket. Please tell me how you design and install a circuit that includes twin 13A sockets, in such a way that only 13A can be drawn from the pair. Are you proposing that twin sockets are never used? Cheers...

Why is a bonding clamp worse? It seems to be good enough for all the other points of earth bonding! Cheers, Howard

You're confusing diameter with cross-sectional area. The diameter of a made-up cable varies with the size of the cores, the number of cores, the thickness and type of insulation. The cross-sectional area is that of a single current-carrying conductor and is expressed in square millimetres...