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    Maximum demand

    Hi blenki cooker circuit is first 10A then 30% of the remainder + 5A if its a soket outlet on the switch.
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    Max zs on rcbo

    Yep it's full of contradictions. OSG table 2D page 103 shows maximum Zs for 0.1 to 5 second disconnection times for circuit breakers BS3871, BS60898 & RCBO BS61009 and the values are different to big red!
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    Max zs on rcbo

    Thats what i've just said!
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    Max zs on rcbo

    Sorry guys but you need to look closer at the headings.Table 41.2 is maximum earth fault loop impedance Zs for FUSES. Table 41.3 only states overcurrent characteristics of RCBOs not earth fault loop impedances as in 41.5.
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    consumer unit supplys

    Had a friend who failed an NIC visit for not running a separate CPC and only relied on the armouring! Don't know where it is stated in the reg tho.
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    !7th & PVC conduit

    Does this mean we're gonna see the return of the council style re-wire where all is surface mounted so only RCD for Ground floor sockets!!! Tee Hee!!
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    PIR Software

    Cheers i will take a look at both and then try to decide.
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    Max zs on rcbo

    I totally agree lenytheloon but i am just telling you what Mr NIC told me on my last visit. He initially pulled me on my paper work for putting the "incorrect values" in the maximum Zs box when the circuit(s) are RCD protected then started to preach the formula on page 50 of the 17th edition. He...
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    Max zs on rcbo

    The guy from the NIC pulled me on this last year and told me that the table on page 50 covers all 61008 and 61009 RCDs not only in TT systems. That being the reason why if you come across a circuit that you can't meet the maximum Zs you should install an RCD so that you can meet the...
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    Where to bond?

    Hi Chops the gas pipe should be bonded within 600m of it entering the property and before any branching off.
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    Max zs on rcbo

    sorry mate only read jasons6930 reply.seems i jumped the gun a bit!
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    PIR Software

    Thanks andyb. Do you use a PDA or a laptop?
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    Max zs on rcbo

    max Zs 1667ohms applies to all earthing systems not only TTs
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    Max zs on rcbo

    Hi KNIPEX max Zs for a 61008 or 61009 RCD or RCBO 1667 ohms.take a look at table 41.5 on page 50 of the 17th edition. All will be revealed. Or not!
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    PIR Software

    Thanks jasons6930 looks good to me, you might have just saved my life! Well my finger tips at least!!!!:)
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    PIR Software

    Eh up fellas, does anyone know of a decent software for PIR that can be done on a PDA then downloaded and printed from you computer? I've had a look at Amtec but have herd some stories that they aint so good. Can only have one board on a domestic with a maximum of 12 ways. Any info would be good...
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    soffit lights

    Hi guys, just been asked to go and do a quote for 8 soffit lights. haven't seen the job yet but was wondering if anyone had any experience with this type of lighting? cheers
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    Dry Lining Boxes

    Eh up lads, does anyone know where i can get some of the old style dry lining boxes that used to have the spring behind the tab? I've got one with a broken tab that's been tiled into a wall and all i want to do is replace the tab with a new one rather than smash the tiles off to replace the...
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    Tinned copper cable!

    Thanks guys. I have recommended a re-wire due to the general condition of the installation and the fact that this is going to be a rental property. After all the primary concern from the landlord is the tennant's safety! Thanks again for all you suggestions
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    Live Earth loop testing on light circuits

    If you're sure you are doing the test correctly and the RCD is still tripping, try doing a ramp test on the RCD to see what current it is tripping at. It might be the RCD that is at fault!

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