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    High Ze - Low Zs

    I know this is a DIY site and so this might be a little beyond what should be posted on here, however i'd really like some opinions on this! Went to look at a system today, earthing arrangement appeared to be TN-S however the earth connection wasn't sweated onto the cable but connected via a...
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    TT System RCD / ELCB?

    Does anyone know anything about the old ELCB (or is it ELCD??) units, they were the fore runners to RCD's i believe. I'm about to replace a consumer unit which is running on a TT earthing system (which at present doesn't have any earth!) and i wondered if i could use the existing ELCB in...
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    BS88 250 Fuses Short Circuit Capacity

    Can any kind soul tell me the SCC for a BS88 250 Fuse? Thanks in advance
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    BS 1361

    Am i right in thinking that the standard 100A fuse for a distributors cut out is a BS 1361? Don't suppose they have a standard short circuit capacity do they? or is it 23k A?
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    Calculating maximum demand

    In my attempt to ask a billion questions on this board!!!... Here's the next corker thats puzzling me. I'm attempting to work out maximum demand in my house using OSG guidelines My lighting circuits draw a maximum of 975W so 66% of that gives 3.3A Fixed alarm circuit drawing a maximum...
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    CSA of CPC of 6mm2 cable?

    Could some kind sould please help me out of a minor drama.... whats the csa of the cpc of 6mm2 twin and earth cable? hope someone can help, i know its a dull question!!! Thanks
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    Supplementary bonding in a bathroom (sorry!)

    I have searched through the archived threads looking for a definitive answer to a question thats really bugging me. To be honest though i'm now more confused than ever!!! Imagine the scene 25mm2 Meter Tails 16mm2 Main Earth Conductor 10mm2 Main Equipotential Earthing conductors...
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    Zones and surface mount trunking

    Wondered if you guys might be able to help me. Do the rules for running cables within safe zones apply to surface mounting plastic trunking or conduit? I know that if the cable is run outside a safe zone its supposed to be placed at least 50mm deep and mechanically protected, but does this...
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    Circuit for alarm

    Hi, i wanted to ask for an opinion!!!! I'm just about to add a seperate circuit to power my home alarm system (at present its run off a spur from the ring) I'm just going to run a radial circuit to a sw/fcu (for isolation) and then power the alarm from that. my question is.... As the...
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    RCD Tripping times

    I've just had a long conversation with a NICEIC inspector regarding which RCD out of a 30mA and a 100mA would trip with a fault current first? Now maybe i've just gone mental or something but everything i know points me towards the idea that the 30mA would trip first, however the guy from the...
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    Best way to remove tiles?

    Hi there i wondered if anyone could help me, i'm about to start removing the tiles in an area in my kitchen (so i can chase the wall out for some electrical work) and wondered if there is a simple way to remove the tiles. Thanks in advance
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