Just curious as to when people are calculating volt drop, how close you allow your calculations to get to the 3% and 5% values before you decide to up the cable size?
For example, if your calculations brought you to 11V for a general circuit would you be OK with that?
could anyone take a look at these figures please and tell me if they are ok or not. thanks in advance
watts where stated
60w x 3
60w x 3
Ib design current
1.30
1.30
In device rating and type
B6 MCB
BS 60898
B6 MCB
BS 60898
Reference method
METHOD
B
METHOD
B
Ambient
temp in...
I have little knowledge of PV.
When working on circuits supplied by a domestic CU, is it fine to just have the main switch off in the CU or should you be isolating the PV as well?
The stickers all over the CU's in this example all say to disconnect both supplies.
Hiya lads a stupid query (maybe )
i was filling in an EICR for a mate and had left my on site guide and reg book at home so i decided to check the net for max zs values for 60898 type b mcbs 6a. 16a, 32a, and 40a but the figures didnt match up with the ones in the reg book. so question what...
I need some advice, I've been doing the OM manuals for installations and come across an electrical test sheet which I believe is fudged.
Background of the story, is the handwritten one (NICEIC System was playing up) went walkies. Lost, never to be found. The QS produced the handwritten one, but...
Hello everybody, I'm new to this forum and require some help.
I'm an apprentice electrician studying in my 3rd year of college and have currently just passed my test and inspection exams. However I am struggling on 1 thingo_O. Don't get me wrong, I know how to test and carry out all procedures...
Hey Guys
I've got a bit of a head scratcher that I was hoping someone could help with.
I have a ring main feeding 7 points. When testing IR btw L&N I get 967Mohm but when testing N-E & L-E I get 455Mohm. I split the ring and tested as 2 radials and the results suddenly come back all clear at...
Why is it that the osg figures don't line up perfectly with the bs7671 figures for maximum zs? For example
16 amp type b breaker
0.8 x 2.73 = 2.18 in bs7671 yet osg says 2.2
Fair enough if they have just rounded it but they haven't rounded every one. For example 32 amp type c
0.8 x 1.37 =...
Was just wondering if any of you guys have had any cases where the Solar Edge generation figures from the portal are different from what the generation meter reads have been.
I've had 2 so far and have changed one a meter on the customers request as the Solar Edge figures were much higher than...
I have some goon coming round tomorrow to give me solar panels for free apparently. Free panels, free installation the full shooting match. I know very little about pv and I've never worked with it. Looking for some facts and figures please gents is this too good to be true?
Hello all, just been thinking over Voltage drop!!
1. Where does the 3% and 5% figures for voltage drop (VD) come from? Appendix 4 (BS7671) gives the figures but why the different values between lights and sockets?
2. Also permitted voltage levels are -6% and +10% from 230V giving a min of 216V...
Year One (2012 - 2013) gave a total income from the Norweb Federation of £455
Marry in to this a saving of £80 in gas (based on a reduction in use from 2011-2012) and £90 electricity total income from the system was £625 (12.5% return on investment)
Total Generation was 13 KWh over SAP
Year...
Recently there's been a lot of talk about scheme registration,and the need to be a scheme member to do part P work,now while a lot of sparks disagree with the way that the schemes infer that the only sparks that do a good job are scheme members,which incidentally we know not to be the case as...
The ECA responds to Climate Change Minister Greg Barker’s claims that around 300,000 measures had been installed through energy efficiency schemes to the end of September.
Read the full news article
Hi
Had our two day MCS audit this week. Three technologies produced two non conformances .
Solar PV and solar thermal ...no wind load calculations.
Having read the entire section on wind calculations I am still at a loss as to how to do the calculation and what to do with the figure when...
I'm just trying to get some clarity on the above. We currently develop EPiSOLAR, software for people involved in Solar PV sales. At the moment we don't include any figures for panel degradation over lifetime, I've been in contact with MCS who have referred me to RECC who have been unable so...
The last problem I have to finish the paperwork is that I have a Zs @DB reading from the house CU of 0.31ohms with a Ipf @ DB of 0.74 ka.
On the test result sheet for the workshop, which has a 40amp rcd, 2 x 20amp socket radials and a 6amp lighting curcuit, what figures do I use to add to the...
So - P63 says - "The sunpath diagram below shall be used to produce a shading analysis for all estimates produced" :frown2: without wishing to spark another debate about the inadequacy of this method is anyone just ignoring it and providing PVsol shading analysis with quotes as usual? I don't...
I was going to post up my table showing the quarterly installations to date vs the trigger points, but it looks like a pain in the arse to do it, so please see all the details and analysis on my blog article instead > Next FIT cut postponed until 1st August 2013 <
obviously it's unofficial...
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc