I have a fairly technical question. I wonder what will happen to the efficiency of the PV system when we shade the bottom of one solar module (HCC) connected in series? Will the performance of the entire string decrease by half because only the top works in this module? Isn't it...
This has me clueless. Why must the neutral be unearthed at the transformer and generator and only allowed earthing at the switch-gear?
I can't see any reason because the neutral will normally not be carrying any current and thus no parallel current paths would form.
Does anyone know of a source of a dual socket back box with an extended 'skirt' (see photo)
The broken one is on a concrete wall with the feed through a hole in the wall at the top of the skirting so other options are limited.
I am having an issue with my 2014 Honda Vezel where the source on the radio would change by itself, that is, it would jump from FM to AM on its own.
Could someone advice me on what I should look for and how I can diagnose the issue.
Hi - No idea if I am writing in the right place. Please, I cannot get a straight answer when the temperature is 0- -20 Celsius - where can I find a chart of what normal KWhr consumption is?
I think mine is using far too much electricity
Just a quick one does a three phase 25mm sub main in swa 4 meters long have to be fused even thou it comes from a bs1361 100amp services fuse then from a standard three phase isolation switch fitted from electricity company? Being swa and 25mm in size would this be acceptable?
I am desperately trying to source several of these Legrand RCD twin socket outlets for office 3 compartment floorboxes but not having much luck. Could anyone very kindly point me in the right direction? :) Many thanks
I have an air source heat pump with a few issues:
1. It gets stuck on defrost mode. When it goes to defrost, it gets stuck and ends up becoming an air conditioner in the depths of winter (fun). I suspect this may be a faulty valve (or what ever reverses the coolant) getting stuck on...
My NIBE F2015 air source heat pump which is only 7 years old has an apparent fan motor failure. The fan turns freely and the motor starter capacitor has been replaced but the unit will still not run. Any suggestions for a fix?
Im Working on a new build site at the moment, and the kitchen layout has changed to include an island with a hob on it.
Meaning im goin to have to get power to it.
The underfloor heating pipes have been run in already and the floor has been screeded.
Theres about 50mm before you get to the...
I need black surface back boxes. PVC or ABS conduit boxes would be fine, as would metalclad, but not the crunchy ones. - There will be some conduits involved.
I can find only Wickes (who sell a single outlet black box only, no doubles), same at CPC. Occasional Ebay sellers do have some with...
Just signed up to see if anyone can point me in the right direction with air source heat pump for my above ground pool. It stopped working a few weeks ago and I thought the display unit had gone. However I've tried to replace it but that doesn't power up either. I've had the top off it and...
Plan is to illuminate a bunch of impressive trees (including a few Californian Redwoods!) in a garden. Client wants to be able to change the colour of the lights easily and (here's the catch) independently from each other.
I've found lights that look suitable in several places but they're all...
Does anyone have any tips on wiring a boiler with mid position valve.
I've been rewiring a house and have had the job of wiring the boiler dropped on me by the plumber.
I have a..
Center mid position valve
Honeywell RF Chronotherm 'wireless' programmable thermostat...
Hi all, Looking for advice, I am an experienced electrician and have been asked by a customer to install electric underfloor heating throughout a converted victorian chapel as a primary heat source. The customer is open to all options. I am intending to have a professional appraisal from a...
We are selling used Standard 1600A Mains Distribution Assembly
In order to maximise the flexibility of standard high current MDAs, the incoming and outgoing
MCCBs incorporate electronic trips, which can be easily adjusted on site from 40% to 100% of the nominal
niceic initial assessment tomorrow! woop woop
Seek permission to isolate
isolate, locked off with signage- keep key on you
prove my gs38 approved voltage indicators on a known source (will use supply side of main switch?)
test between L-N,L-E,N-E for voltage
re-prove voltage indicator on known...
I need to replace some 12v outdoor PIR`s formerly made by Smiths, then Timeguard. The CODE is SL099 easily found on Google. However, they are nowhere to be had as they have been discontinued.
They send a signal to the mains control box (CODE SL055) which controls up to 3000W of lighting and...
I am a student and as part of my thesis there is a high need to perform a DECs calculation on a set of buildings. Of course the overall process is not related to a commercial process and therefore this is not related to the standardized method. So my question is if there are open...
For a project at university I need a fairly intense light source for a fluid dynamics experiment, as the previous one broke. I've been advised a halogen source of around 50W should be sufficient, though as I am a mechanical engineer, my electronics understanding is very basic.
First post on here!
I need a 10 way c/u with the main switch on the left. MK does one but I've read some pretty damning reviews. There's also a brand called Techna that do one, but I can't find anything on that one. Any advice would be much appreciated. :stooge_curly:
I would like to be able to plug a mobile catering trailer up to a mains source.
The trailer is behind a hire shop and the manager has agreed to come to an arrangement that will allow us to hook our trailer up to his mains if I can find out how to do it legally taking into consideration all the...
Giona UK - Electric Water Heaters
Hot water only. 900 watt pump on the 300 litre version. COP of 2.98
Am told this is new tech because it combines the heat pump with a cylinder.
Will it get MCS?
Hi everyone, I'm making a house model in which I use one VAC bulb and another one but uses DC source. What blocking me at the moment is the electric source of the VDC bulb. I want to use circle in phone charger (I have many of them, ones of Nokia 12xx) to transform VAC into VDC and I tried but...
Have a customer with no heating at all in 2 of her bedrooms ( No gas supply also ) both rooms are around 6 x 3 meters .. Any suggestions for a decent panel/convector heater that will heat these rooms adequately?
I have never posted before but i need some advice, I need to source a LED Driver my wholesaler says that it cant find it the driver in question is
24v dc 2 amp
the above is what it says on the driver it self the driver is used on a led round feature in a retail unit
Hey all, reading through the 17th trying to get my head around some areas of it. I did physics at school and some at uni so electrical calcs usualy dont bother me the slightest.
BUT, If were calculating voltage drop over a reasonable length radial, for example twin and earth or SWA feeding a...
Hi, My name is Phil and I am based in Warwickshire, whilst I have many years of experience in the electrical industry I have recently come across a problem that I cannot recall seeing before. I installed some new fluorescent fittings in the local community hall and upon carrying out a Zs reading...
Hope someone can shed some light on a recent problem:
We have attended a problem whereby an RCD was tripping in a property due to a capacitor (suppressor) in a boiler control box shorting. We have removed the capacitor, and now all seems well.
The questions are,
Does anyone know...