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

 

[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.

 

[i=p/u]

isit genral pupose fuse tables as there is no 1361 fuses

 

[malcolmsanford]

That is because the new amendment as deleted the reference to the BS 1361 fuse i-p/u and now refer to the BS 88 series

I remember you lost your BRB book if you have the OSG it will be on page 102 table i for 0.4 secs

they are

Zs 5amp 8.4 ohms

Zs 15amps 2.6 ohms

Zs 20amps 1.4 ohms

Zs 30amps 0.81/0.93 depending on you CPC size

 

[i=p/u]

so am ok in going with the calculation of zs and if is lower than 2.6 ohms i can change to 15A 1361 fuse carrier. or just convince them to change to differnt energy lamps

 

[GLENNSPARK]

Do a Zs mate and Remember to "rule of thumb" the TABULATED values of Zs in BS7671.....then see if it complies.........

 

[i=p/u]

lenny if you out there, have you ever seen of a fuse that acts like a type c mcb its for a 1361 5A circuit thats tripping with the inrush of the halogens??? just asking as i seen you have a fuse shop .

 

[GLENNSPARK]

Maybe you can get a "slow acting" type.......

 

[GLENNSPARK]

You may be able to get a fuse with the charactaristics you need but it may be a BS88.........

 

[i=p/u]

well was just about to say that glensarks, when i was looking the other day at sockets when tripped all fuses were bs88 for sockets which were all in one board and then all the lighting is in one board. now all lighting circuits are 5A do i need to change the fuse carrier to 15A and are these easy to get. or could i just get bs88 hbc 5A fuse

 

[GLENNSPARK]

Go for the cheapest (and easiest) option first mate whilst still remaining compliant and go for the fuse first..........

 

[GLENNSPARK]

Dont forget, BS88s are very common in industrial applications and most (not all) but most industrial loads are inductives so my thinking is you will probably be able to get a BS88 thats suitable......