I'm doing my 2396 design project, and would like some clues about typical commercial installations, and their maximum demand and incomers.
Its a large Argos style shop, I've got the max. demand at 500Amps, that could probably come down to around 400 or so with diversity, that'd give me a TP-N...
Hi,
I'm in my second year at college, but I'm a bit unclear on what the max Ze should be for a TT system. I know that the regs say 200ohms, and my tutor said that it would be acceptable if you found an earth rod which gave a reading of 200ohms. However several of my mates who have been qualified...
Hi People,
Just had a friend call me asking what the max zs is for a 3 phase, c type, 60898, 40A when its on a TT supply. The supply to the board is from an rcd 300ma, he says the niceic front page in installation book says 0.46 ohms but he's getting results of 4.03 ohms. I told him as its a...
hi folks was wonderin if u have a tt system with a ze of say 113ohms, and a circuit say lights with a r1+r2 of 1.33ohms, in the section on test results were it asks max zs allowed by bs7671.... the answer for a type b 6amp mcb would be 6.13. So if my zs is ze..113+ (r1+r2)1.33 =114.33
which is...
hi
i have a 60 amp main fuse supplying 63a main switch in cu. my question is about OSG table 1b max demand figures (calculations). When applying these figures ie no diversity for shower, no diversity for first ring main it seems that any installation with a 60a main fuse cannot have a electric...
Filling in a EICR i needed values for max Zs
I looked for ages using Giggle and eventually found this link
http://pws.schneider-electric.co.uk/internet/pws/literature.nsf/luAllByID/NKIY-5JUHSL/$file/MGD5032_section2.PDF/
hope it may help some folk. I may even find it again when I need it...
Hello everyone,
lately alot of customers have been asking to change there standard 50watt lv halogen spotlights for the more energy efficient LED gu10's.
My question is... is there a max number of these that can be on a circuit?
Previously the rule of thumb was 10 but with the loads...
lazy username
Thread
circuit
design
dimmer
dimmers
gu10
led
lighting
max
number
Looking at a job at the minute which is only for 3 IP rated double sockets down a garden.
Problem is the garden is almost 35 meters long, then its another 21 meters from switch fuse in the house.
Anyway, what I need to double check is when choosing cable sizes for my runs, what is best to...
When calculating the max earth fault loop impedance of a 3 phase MCCB that you use the nominal voltage ie in this case it is on a 60Hz system (120 / 208V ) and a 350A MCCB : therefore 208 / (350 x 10 (C type)) = 0.05 ohms
Therefore Zs is required to be equal or lower than this in order for the...
hi guys,
what is the max allowable disconnection time times under fault conditions for kitchen lighting, bedroom socket outlets and also for a shower?
thanks in advnace i appreciate all your help
Hi All,
Is there a maximum length for an earthing conductor, which is connected to the earthrod in a TT installation?
If so, does anybody know what the max length please?
This has no doubt been asked often by non electrical minded folk like me but when a socket extension says maximum 13amps, does actually that mean 4 plugs fitted with 3amp fuses like desk lamps etc (or 5a+5a+3a) or does it go by the actual amps of the equipment and you could have say 6 plugs with...
stoutlad
Thread
amps
equipment
extension
fuses
max
question
socket
total
watts
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