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41.2 to 41.4 is for tn systems and none are for 1s disconnection times as 411.3.2.4

just as an update to this thread can anyone tell me in the BRB the max zs for an a.c. unit on a 40amp circuit ? - the Nic inspector couldnt and also the guy who took my 17th edition course !

copied from the voltium newsletter which i know not all members of the forum get - a bit long winded but worth thinking about Just about every sector of the fire protection business now seems to be targeted by counterfeiters and rogue manufacturers. Nowhere is the risk greater than when the...

tried it without the PIR

thought that originally but lights are LED- minimal start current, and problem occurs in only 1 room and still does it with the other room taken off the circuit lights are only a couple of months old they were put in by another firm that folded over christmas so cant get them to come back

had a headache problem today thats driving me mad, i'll try and give as much info as possible 10 amp type 2 mcb lighting circuit feeding 18 600x600 led modular fittings over 2 rooms (9 in each) measured load when on 3.8 amps total feed comes from the board to a key switch then up to emergency...

stuck on 13 - ive seen the tallest mountain bit but tried everest , Mauna Kea headbang , what am i missing?

dt know if this is the sort of thing you are after http://www.aianos.co.uk/radiators.php ---------- AUTO MERGE Post added at 19:01 ---------- Previous post was at 18:59 ---------- or these...

they have changed the mem3 - you cant convert the mcb's now, but i think the pods for mem2 are only good for single poles

thats ok then, we had a company come in to put in the earth rods and they done the earth rod resistance so i only need to do the r2 on the cable to the earth bar and add it on :Applaud

so what is the testing procedure for Ra? :C

there is no Ze on a TT system is there? its called Ra i thought

hi this is the setup we have http://mail.aol.com/32761-111/aol-1/en-gb/mail/get-attachment.aspx?uid=1.32165763&folder=OldMail&partId=4&saveAs=ELR__CTs_Product_Aid_Final.pdf its basically to protect the switchgear and associated cables to the Db's all circuits upstream are...

had the same thing with a 3 phase ac unit - we used a tp mcb with an rcd in an enclosure next to the board , it was an Memshield 3 board and was told they dont do a triple pole rcbo

hi all i have a 315 amp 3phase TT supply head from edf into an outdoor enclosure and it is connected to our mccb (with earth leakage relay and shunt trip) this then goes up to the plant room to a 400amp busbar (via an isolator). my main earth bar is upstairs with the busbar (as EDF dont want...

correct ;)

Hi all When filling in an NIC EIC for a TT system in the column maximum Zs permitted by Bs7671 do i put the values from table 41.5 (brb) ie 1667ohms if all the circuits are protected by BS61009 rcbo's regardless of the type? thanks

who in their right mind would buy it ?? :C

just seen this on ebay - how dangerous is this?? http://cgi.ebay.co.uk/HOOK-UP-CABLE-2-MALE-3PIN-PLUGS-BOTH-ENDS-/220666313023?pt=UK_Cables_Hookups&hash=item3360bcb93f

http://www.petershed.co.uk/index.php?main_page=product_info&***th=1_8_13&products_id=224