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    Dodgy trade pictures for your amusement! - 1 Million Views!

    Similar one at my parents, though it is fed in T&E from around 1970 but switch predated that by some decades.
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    Can plastic trunking be used in a commercial kitchen

    You get metal clips to fit inside the trunking and screw to the wall behind that do this fire support aspect. Some are custom made to match (but often impossible to get in less than a pack of 100) like the Marshall-Tuffex ones, or you can use other metal clips every so often to prevent collapse.
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    Cheapest source of EN standards?

    Thanks! Just PM me with any details.
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    Electrak - no RCBOs

    I recently measured a couple of items due to an odd RCBO tripping problem but found the modern desktop style PC PSU was only leaking about 0.5mA, the other stuff (monitor, network switch, both class II or at most FE) were more or less 0.1mA.
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    Cheapest source of EN standards?

    It might be worth looking at the IET library, but a cursory search did not show the standard appearing in the results. I found this at very reasonable price: https://www.evs.ee/en/evs-en-62305-1-2011 However, they have paper versions for parts 1, 2, and 4, but not part 3 for some odd reason...
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    Cheapest source of EN standards?

    I was wondering what is the cheapest option to get a (legitimate) copy of the EN standards, such as IEC/EN 62305 on lightening protection? I vaguely remember someone pointing out that the BS EN details are basically the same as the rest of the EU, and all derived from the IEC. So rather than...
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    UK Supplementry Bonding not connected.

    Well RCDs are fitted, whether they are "protecting" depends on them working! I do wonder how often the self-test buttons are used in most cases?
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    What would explain this strange measurement in the kitchen?

    The OP is Canadian, it could be a link on one side of a split-phase breaker, with one load on the L1-L2 @ 240V and the other on linked L?-N @ 120V.
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    What size crimps

    Ferrule kit and self-adjusting crimper in Lidl just now for £15 or so. What not to like? The colour tells you the ferrule size BUT there are two standards (at least) in use! Some RCBO have different flying lead sizes but likely going to be 2.5mm - 6mm range, strip one, see if it matches a...
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    Mig welding and cable run.

    If you are using a welder with 13A plug then a 13A extension lead is practical. You could make one with 2.5mm which is about as much that will squees in to decent 13A plugs & in-line sockets and a quick check says it is OK for VD at 40m length. Or maybe better, put in a couple of fixed...
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    Earth resistivity testing in wet ground

    I am guessing you are testing the rods by doing a Zs on them? If so what you are actually measuring is the overall loop from transformer earthing arrangement, via the supply cables, to your rods and back again via the Earth. The fault might be at the other end! Do you have any option to use...
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    Mig welding and cable run.

    Would that also apply to those outlets with an interlocked switch? I.e. where the contacts cannot be live without the appropriate plug being inserted to allow the switch to be turned to the on position.
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    The wisdom of equipotential bonding

    Again it depends upon the circumstances as to which is a greater risk. All class I products are earthed, so any with external metallic parts will be CPC bonded anyway and touchable. Under ADS failure, or open-PEN fault, they might become live and if there is a real possibility of them being...
  14. P

    Mig welding and cable run.

    To meet 5% voltage drop at 32A you need 10mm, for a more realistic 13A load it is 4mm. There are three sizing requirements for cables: Current carrying capacity (CCC) to avoid overheating Voltage drop (VD) so end loads are operating within expected tolerance Earth fault impedance (Zs) to make...
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    Mig welding and cable run.

    For any outdoor socket you should have RCD protection, that way you still should have shock protection & ADS. For 32A and 50m extension a quick check is saying 10mm, for 13A it is suggesting 4mm. Generally that won't fit a typical 13A plug/socket but a metal-clad socket and IP68 gland, plus 32A...
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    The wisdom of equipotential bonding

    It comes down to what are the risks you are looking to avoid and under what circumstances. Equipotential bonding avoids the risk of two or more parts having significant difference in voltage between them, but does not deal with the issue of the (now single) conductive assembly being at a...
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    Earth resistivity testing in wet ground

    Seeing 5k ohm in any situation should be ringing alarm bells! It is not uncommon to see a 2:1 or more variation over the seasons due to moisture levels, but that high looks like it is buried in some fundamentally dry area (e.g. basement), in VERY dry soil which is uncommon in UK at this time of...
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    RCBO curve

    I think if the MCB's rating is at or below the cable's CCC then the trip time is not an issue, as they have similar/coordinated thermal overload characteristics. Meeting ADS time is a different matter of course!
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    RCD testing issues

    Assumption is the mother of all major foul-ups! Start with the basics, like IR testing, RCD testing on its own, and checking the leakage as circuits are powered on. An RCD that fails to trip-test on its own is deeply suspicious, but until you have ruled out N-E faults an anything still...
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    RCBO curve

    One of the major advantages of RCD protection is it is totally unrelated to the load's operating current - you can define the MCB arrangement to suite the load profile, and the RCD side to deal with faults to earth which could be a far higher impedance (e.g. in TT earth case). Having said that...

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