I also assumed there was no fuse, but without sight of the whole fitting some of the explanations above didn't make sense.
One explanation was there could have been a fuse above the terminal block as I thought short lengths can be unprotected.
Yes, it's a bit of a con if we are being asked to say what's wrong (no fuse) when there doesn't appear to be a fuse holder in the photo that we are being asked to judge. I too assumed that there was a fuse holder out of shot, further down the cable to the lamp.
It is a case of "the luminaire 3-core has been wired to the incomer terminals bypassing the fuse *which isn't present*", rather than "...bypassing the fuse which we can see has been bypassed".
The top left of the image seems to include just enough of the load side of the fuse spring-contact to be recognisable, but I can see no evidence of where the fuse connects to the incomer, even allowing for the angle.
Looks like the reason the grommets were back-to-front was simply because that's how they are shipped!
It's not a con if you know how to wire one up!
Nationality ?. Just curious.
Quite. ;-)
Adam should have said, 'to all those familiar with these wiring systems, here is a partial picture ...' ;-)
It could indeed (but I suspect it's built into that enclosure).
One of them has a bit.
Whilst I agree, I believe sleeving is acceptable?
Cheers, T i m
The lamppost or the cut out?
Back in my student days, one exercise was to look at the supply to a factory. IIRC it was a 3-phase, 11kV supply to substation A, which fed private substation B. It was proposed that a new private substation C was required for a new factory and the exercise was to determine if C would be better fed from A or B, taking into account the difficulties of cable routing, discrimination, etc.
As well as completing the exercise, a small group of students put in a spoof version of the answers. Part of it included moling for the supply to cross a road, using a live mole. This also included what to do if the mole got stuck or lost - using a ferret retrieval system.
SteveW
There is a bit of a clue in the name of the thing though - "cut out", that one ain't going to.... ever!
Sure, but surely only after you know what 'one' is? ;-)
Had we seen the picture of the whole thing I think 'most people' would have got your drift. Whereas, only giving us half the picture means that many would come to the wrong conclusion ...
Hang on, how did we get back onto Brexit?!
(And it was a brilliant example though, thanks <g>).
Cheers, T i m
Only a con if one has attempted to prove their intellectual prowess before knowing what the thing actually is.
Perhaps simply waiting to see what the actual problems were would be more prudent.
Because some moron couldn't resist typing the sequence of characters.
There were 7 lamp posts and 5 of them were wired up in a similar way. I just posted one photo.
However here is what I found to be at fault (I know that some of the faults could never be worked out by just looking at a photo)
6.Loose lock nuts. These are easy to get very tight as the brass plate is removable
I'll just have to guess that the live wire was left out at this one as this fed the last two lamp posts that had not been wired up.
And my next question is "Where are they supposed to be powered from?"
Because no one can find a SWA in the building.
Further explanation on no 5. The banjos are fitted below the brass plate and I believe that the installer expected them to marry up with the earthing screw that he threw away.
I thought it was referring to the hole in the lamppost?
Quite, especially if there is a lower rated one out of shot and downstream of that junction box. ;-)
Cheers, T i m
Ah, that sounds like a literal Left Brainer interpretation rather than just a Right Brainer playing along with the game (how sad it must be in your head ... or probably not?).
Whoosh. Have you never played a game before?
There you go, you *can* be funny!
Cheers, T i m
If you don't know what a lamp post cut out is why did you post?
Ah, so is the fuse holder the object that we can see one terminal of at the very top left of the photo? I presume there should be short length of brown wire from the top of the lower terminal block (which the luminaire live is currently connected to) to the bottom of the fuse housing, and the luminaiire live should go to the other terminal of the fuse holder (via the fuse) which is off the top of the photo.
I notice you haven't commented on the non-standard colours of wires in the two cables that approach from the bottom: the use of black (instead of green or green/yellow) for earth and the use of grey with blue sleeve (instead of blue) for neutral. OK, so they probably used whatever cable they had, but they should have used cable with standard wiring colours and allocated those colours correctly.
I've never bought much specialist cable, but the flexible braided 3 core I bought had three phase colours - the seller didn't specify. It occurs to me that you can use three phase colours for single phase, but it wouldn't really be respectable to use green/yellow for a live phase so the three phase colours are more versatile.
The fuse itself is mounted in (part of) the lid of many of these, such that when you remove the lid you also withdraw the fuse. The fuse carrier bridges the lower live terminal to the upper (you can see the socket wiping contact for the blade on the fuse carrier to the side of the live incomer terminal in the photo).
Here is a wider shot of a similar one that makes it a bit clearer:
If you are using 3 core SWA, then those pretty much are the standard colours; nominally three lives, and the armour as an earth. (4 core would add blue as well)
Here its been used with the cores repurposed as L, N, & E. They have been overmarked (where appropriate) with the colours to indicate their use.
(Technically speaking you could use any colour for any purpose if its correctly marked. However there is a convention to use the grey as neutral and the black for earth in these cases - perhaps to help mentally shift away from the old colours where black would have been N).
Thanks. FWIW, I think you're being harsh about point 7. That loop has some artistic merit.
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