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    isolated supply help!!

    I get that but now the client is asking questions, we didn't design the system we just maintain it, there are no drawings on site, my main concern is this LV board and how I get round that!
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    isolated supply help!!

    To me the inverter supply stays IT but the local LV supply just needs to be rodded down or the CPC connected with the neutral on the secondary side of the transformer however that's why I thought I would ask. Beer is always a good answer I may join you 😂
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    isolated supply help!!

    So the LV board is fed via 2 phases from the inverter supplies via an isolating transformer. Its still live at night time because these are on grid inverters. We maintain the site as a company and the owners have asked for an EICR. A final circuit on the LV board does actually have an insulation...
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    isolated supply help!!

    Guys in a solar PV plant room I have a single phase LV board for power and lighting. This is fed via 2 phases off a solar inverter through a 415 > 230v Isolating transformer. The earth conductor in the secondary side of the transformer is not connected. Theres a 16mm cpc going from the LV board...
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    Zs testing

    Evening all. Is there a regulation or any guidance regarding live zs testing with loads connected.... Eg zs testing on a 3phase motor whilst it is running. Could the current being drawn damage the meter if testing at the end of line.... Or doing a live zdb test, is there any guidance to say...
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    Signing work off.

    Hello guys I am after some advice as regards signing off work the correct way / notifying relevant authorities. Current I am full time on the books for a large utility company in which I am the qualified supervisor and hold my 2394/95 testing quals. Previously I tested and signed my work off...
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    TL inverters And array frame bonding

    I cannot find anything regarding what I am asking.... Getting into the wiring regs side of things rather than PV ...but a second pair of eyes wouldn't go a miss. Many thanks
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    TL inverters And array frame bonding

    Hi again. Right, I am seeing very mixed reactions and comments about the below question, I am just hoping to find a basic answer and reference please. If you are installing a TL (fronius primo 3.6 in my case) to a domestic property, in the loft space with 16panels already installed on the...
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    Solar PV ground fault

    Hi guys. Got an issue with a DC string ... I am doing some DC testing and one of the strings is 0.5ohms (negative to earth). Positive is 29mohms and rising to earth. Now usually I would expect to find a crappy mc4 or a damaged cable but this time I am on a farm where all the cable is visible...
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    18th edition RCD max disconnection times!!

    Hi all. I am seeing different figures here all over the net, table3a (p363) states a 30ma RCD has a trip time of 300ms max. So at 5x is the maximum 60ms? I seem to recall 200ms and 40ms for a 30ma and these are the figures I am seeing over the net... Please I just want the correct figures for...
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    Metallic pipes and outbuildings!!

    Ok.... Still not too clear. If it's a tncs at origin. A new dB in the outhouse with metallic pipe work in there I DO NOT connect the swa CPC / armourings at all and instead TT at the outbuilding? Thanks all
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    Metallic pipes and outbuildings!!

    Morning all. Couple of questions regarding the 18th in regards to outbuildings with metallic pipes in them, causing very different answers between a few of us in the pub! Right so. If a metallic pipe enters any building but has an 'insulating section' then it need not be earthed? I do not...
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    'Piggy backing' tails

    Hi Guys, Came accross an install today where a new 2 way board has recently been installed to make room for a new shower circuit (Db1 - 16th edition full board). How the 'electrician' had wired it was by using 16mm tails from DB1 main switch which now has 25mm and 16mm crammed in there...
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    UK Ze Test, NICEIC QS ASSESMENT

    Evening all, My first post here, hope you are all welcoming :) I have my QS assessment coming up next week with the NIC. Question is, I am going to a property where I installed a 2way board, split the tails, upgraded the bondings etc. Straight forward job but the resident has a 24 hour oxygen...

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