Professional electrician ?

[Guest111]

What a chuckle,just read this months P E magazine and there,s a cracker in the faults section,a photo of a switched fused spur wired in 2.5 straight into a set of henly blocks with the tails! No wait thats not the funny part,the laugh is the so called electrician who states that "it was my mates house and there was 100 amp going through a 2.5 feeding garden lights,and it had a 13a fuse in the fcu.Obviously a classic case of someone without a clue,just because it,s connected to the henly,s and therefore protected only by the 100a? service fuse doesnt mean its taking 100a, and if it was they,d be big outside lights and what about the 13a fuse? Just proves worryingly how little knowledge some people have.

 

[Knobhead]

You’ve only got to spend five minutes on here to realise that!

 

[Des 56]

Its a change though from the usual "there's X amounts of volts flowing through it"
Perhaps there is X amount of volts flowing through it with that 100 amp current as well :mad2:

 

[sparks1973]

What a chuckle,just read this months P E magazine and there,s a cracker in the faults section,a photo of a switched fused spur wired in 2.5 straight into a set of henly blocks with the tails! No wait thats not the funny part,the laugh is the so called electrician who states that "it was my mates house and there was 100 amp going through a 2.5 feeding garden lights,and it had a 13a fuse in the fcu.Obviously a classic case of someone without a clue,just because it,s connected to the henly,s and therefore protected only by the 100a? service fuse doesnt mean its taking 100a, and if it was they,d be big outside lights and what about the 13a fuse? Just proves worryingly how little knowledge some people have.

yep...seen it phil.....theres another belter (quite literally ) n all....just take a look at the right hand page of `caught on camera`...now, in the top left of the right hand page check out the pic of the joints on them tails WITHOUT any enclosure of any kind....hmm...definately the worst of this months nastys in my op....

 

[malcolmsanford]

Phil i've seen a 10mm cable 3 phase supply coming off of a Bus chamber that had 1200amp fuses protecting it .................... granted the 10mm was feeding a 32amp TP+N switch isolator for a battery charger.

When I asked as the know it all apprentice about 10mm on 1200amp fuses .was told by the sparks.

"Well was going to use some 6mm but could not find lugs big enough to bolt onto the bus, hate over specing the job"

 

[sparks1973]

the one with the genny though will never cease to crease me though....an `earth rod in a bucket of sand?`....

 

[sparks1973]

Phil i've seen a 10mm cable 3 phase supply coming off of a Bus chamber that had 1200amp fuses protecting it .................... granted the 10mm was feeding a 32amp TP+N switch isolator for a battery charger.

When I asked as the know it all apprentice about 10mm on 1200amp fuses .was told by the sparks.

"Well was going to use some 6mm but could not find lugs big enough to bolt onto the bus, hate over specing the job"

well...you can fuse either end Malcolm......as long as the demand doesn`t exceed the Iz of the cable....

 

[Guest111]

yep...seen it phil.....theres another belter (quite literally ) n all....just take a look at the right hand page of `caught on camera`...now, in the top left of the right hand page check out the pic of the joints on them tails WITHOUT any enclosure of any kind....hmm...definately the worst of this months nastys in my op....

Yep spotted the fault straight away,should have rcd to protect against direct contact lol,seems that bodgit and scarper really are uk wide after all.:joker:

 

[malcolmsanford]

Thanks sparks ..............................

 

[sparks1973]

Thanks sparks ..............................

hmm....sorry Malcolm....

 

[malcolmsanford]

hmm....sorry Malcolm....

Sorry sparks was pulling your chain a little .....................but your spot on you can indeed have the PD as you say. I was reminiscing us old fogies tend to do that al ot when you get to my age

 

[sparks1973]

well as far as i can see the worst aspect of the `install`...that Phil has pointed out is the lack of a means of isolation...

 

[Guitarist]

well...you can fuse either end Malcolm......as long as the demand doesn`t exceed the Iz of the cable....

And the length before fusing doesn't exceed 3 metres of course.

 

[malcolmsanford]

Well certainly for fault protection yes G it should be that.

Overload is slightly different as in reg 433.3.1 (i) and (ii) and the fixed load

 

[IzzyS]

I don't think the forum should be giving the impression, to those that don't know any better, that 2.5mm T&E on a 100A fuse is a good idea. Fair enough, overload protection may be omitted on account of the 13A maximum loading, but under short circuit conditions there's every likely-hood that the 1.5mm cpc will be vaporised. 543.1.3 applies...