fuse blown!!! quick

[i=p/u]

bulbs blow all the time , but this time it took out the fuse when turning on????

any reason why

 

[High Tower]

bs 3036??

 

[topquark]

bulbs blow all the time , but this time it took out the fuse when turning on????

any reason why

Physics! Need more info mate.

 

[i=p/u]

1361 fuse, was a 3A in a 5A drawer, if thats what you call them..

 

[Geoffsd]

Lamps draw more current prior to 'blowing'.

Less common to blow fuses than trip mcbs.

May indicate load is close to overloading 3A fuse - (nominally 690W) put in a 5A.

 

[i=p/u]

aye , i did, wasnt many lights on when it happened.. probably just weakend over time????

 

[topquark]

What type of lamp then, I'm a bit confussled now. 3A in 5A drawer (lamp in RFC for example)?

 

[i=p/u]

sorry, the fuse carrier is rated at 5A with a 3A fuse inserted,, just a normal 40W bulb

 

[Knobhead]

If you’ve still got the lamp and can see the filament I think you will find it’s totally disintegrated and not just broken at one point. A lamp can fail catastrophically where the filament vaporises and the vapour will carry many times the rated current, this is what probably blew the fuse.

 

[robsparky1975]

Agree with tony,generally lamps only fail when cold and first energised,especially if the gls type,and when the filament pops,the"temporary short" will take out the fuse,because the filament has such a low resistance when cold more liable to break and blow a fuse,did see a place in us a car garage that has a standard gls lamp its been left on for the last 60 years,they best not switch it off lol

 

[Knobhead]

Talking of old lamps I helped a mate get some stuff up in to his loft and there low and behold was an “Edison Tear Drop” lamp still working! Can I have that please? Yes sure but lets get the rest of the stuff up first. It had to happen, passed a long length of timber thought the hatch and smashed the lamp. I would have loved it for my collection of old gear.