bs 1361 fuse

[i=p/u]

hi ho, i just replaced replaced 8 gu10 50W bulbs in room as were blown. there is 18 on the one circuit plus 3 mini strip lights under benches very likely 18W each, they were all working when i left and when she left room she switched all 3 switches on 1 go and she said the fuse had blown, would you say by her switchen all on one go would of blown the 5A 1361 fuse ?? i personaly think to many but when you add it up its under 5 A

18 x 50W = 900W / 230V = 3.9A
3 x 18W = 54W / 230V = 0.23A so roughly 4A all in, which is under 5A

any input guys before you all go your local niteclub and dance like your up a ladder and fallling

 

[GLENNSPARK]

That will give the o/c protection he needs here......nice one tel..

 

[mogga]

HALERS lol BTW any scottish lads I hear the rep is "eyecandy" Might need to give her a wee call

 

[GLENNSPARK]

HALERS lol BTW any scottish lads I hear the rep is "eyecandy" Might need to give her a wee call

Did a rewire on this kitchen a few weeks ago....lovely bird she was....we had to go back to put a new central heating timer on for her earlier today....slurp...lol..

 

[i=p/u]

well i think change the lamps is easies option, what about that fuse that allows inrush currents tel, do they exsist that will fit in 1361 fuse carrier. if i changed to 6A or 10A mcb wouldn't that mean the zs would change and maybe not meet the requirements.

 

[platty1005]

i=p/u The steady current drawn by a lamp is when it is at its operating temperature which for incandescent lamps is around 2000 deg C the initial current draw at 25deg C can as as much as 5 -10 times the steady current. So switching all switches together gives a massive surge just like a motor starting current.
Put in the largest fuse permissible for the circuit cable and advise customer to switch the switches one at a time
If you uprate the fuse you need to confirm the Zs still meets the 0.4 disconnection time

 

[i=p/u]

is there any mcbsrcbos that would fit in the fuse carrier place

 

[i=p/u]

so you with me platty in chancging the 5A fuse carrier to 15A as it is on 1.5mm t&e, its a dr's surgery so they can take instructions and only the sockets are rcd protected

 

[GLENNSPARK]

Can you replace the cable with a 2.5 at the board then into an enclosure with a C type breaker in and then using the installed cable....out to the lamps?........

 

[i=p/u]

was thinking c type breaker too but why 2.5mm for 15A fuse. am i missing something reallly badly here.. do you think would still trip the blow 15A fuse, the type c breaker does sound the pigs ears

 

[platty1005]

1.5mm T&E ref method C (clipped direct )or buried in masonry has a max current 20A page 228 BS7671 Max Zs 1.70 at 70 deg so 1.7 x 0.8 = 1.36
If Zs is measured at less than 1.36 at furthest point on circuit and cable is installed Ref method C then 15 Fuse should be OK

559.6.1.6 max overcurrent device for normal lighting circuits 16A

 

[GLENNSPARK]

1.5mm T&E ref method C (clipped direct )or buried in masonry has a max current 20A page 228 BS7671 Max Zs 1.70 at 70 deg so 1.7 x 0.8 = 1.36
If Zs is measured at less than 1.36 at furthest point on circuit and cable is installed Ref method C then 15 Fuse should be OK

559.6.1.6 max overcurrent device for normal lighting circuits 16A

yep. got it platty (p) 282...thank you. :crazy:

 

[i=p/u]

where is the max zs readings for protective devices in the green 7671, if you can help

 

[malcolmsanford]

1.5mm T&E ref method C (clipped direct )or buried in masonry has a max current 20A page 228 BS7671 Max Zs 1.70 at 70 deg so 1.7 x 0.8 = 1.36
If Zs is measured at less than 1.36 at furthest point on circuit and cable is installed Ref method C then 15 Fuse should be OK

559.6.1.6 max overcurrent device for normal lighting circuits 16A

Think a GU10 Lamp holder might not come under that regulation

 

[malcolmsanford]

where is the max zs readings for protective devices in the green 7671, if you can help

Same as the Red in the tables

 

[i=p/u]

found it, just trying to get to grips with this book as first time looking at it. have you any valuable input to my original post malcom.