- Thread starter Megawatt
- Start date
In South Africa, our job description was Master Installation Electrician, being able to install, maintain and certify explosive and inflammable installations.
She looked great in the classroom too with her leathers, boots and little whipI preferred to be caned on the bum by Miss McSpanker.
There is still obsolete 2 phase power being used in some areas of the US, Philadelphia is one city where it still exists, I have never seen it though. Polyphase refers to either 2 or 3 phase, it would not refer to what you call "split phase" but is considered single phase.
Two-phase electric power - Wikipedia
Certainly I would refer to 110-0-110 style of supplies as "centre-tapped" and not polyphase - that (to me at least) implies phase angles other than 0/180 deg that you can get from a single phase supply & transformer.
As you say, 2-phase exists but is very unusual as 3-phase is better is practically every way. You used to see 6-phase (or more, which can be generated by weird transformer arrangements from a 3-phase input) when feeding large DC rectifiers to get a smoother output, but these days it would be electronically converted and regulated that way.
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Dustydazzler
I still want to know what a master electrician is compared to a journeyman electrician...
can you be a master journeyman....
and what the heck is a pony panel
can you be a master journeyman....
and what the heck is a pony panel
In London, black cab drivers are "Journeymen" if they don't own their cab... if they do own it, they're "Mushers"... no idea where any of that comes from.
That is another thing, when we hear "black cab driver" in the UK we know it is a driver of a black cab (hackney carriage)!
Somethings I noticed
Ground = Earth
We don't use EMT conduit only RIGID and no real maths for bends etc.
We don't use those turn things for connecting wires - we use connector block or Wagos
your Light switches often look oblong ours are mainly square - no idea why.
Ground = Earth
We don't use EMT conduit only RIGID and no real maths for bends etc.
We don't use those turn things for connecting wires - we use connector block or Wagos
your Light switches often look oblong ours are mainly square - no idea why.
EricMark
-
Going back to my dad's time pre-war, an apprenticeship lasted 7 years, the first 5 were spent with one firm, the next 2 were split into 4 x 6 month periods with 4 different firms, where you learnt the things not done in your own firm, those last 2 years you were called a journeyman, this was before apprentices had to go to collage, it was considered when day release was started that the apprentice would gain this broading of his knowledge in collage and the journeymen stopped in the UK. Also it has been for many years that you finished your apprenticeship at around 21 years old, so the 7 years started at 14 years old, by time I started you did not leave school until 16 years old so to finish at same age the apprenticeship needed to be shorter. Now leave school at 18 years old, so instead of day release we have block release in collage, so apprenticeship even shorter.
Being frank I spend a lot of my apprenticeship as a skivvy, doing fetching and being cheap labour, my wife as a hair dresser had to pay to be an apprentice, and learnt how to wash hair. So likely the collage block release does teach more than the old apprenticeship.
Being frank I spend a lot of my apprenticeship as a skivvy, doing fetching and being cheap labour, my wife as a hair dresser had to pay to be an apprentice, and learnt how to wash hair. So likely the collage block release does teach more than the old apprenticeship.
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Dustydazzler
The other thing when watching a YouTube video from America/Canada is all the cables are sized by ‘gauge’. The lower the gauge The bigger the cable.
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davesparks
Journeyman is a very old term, it originates in Europe as far as I know and describes someone who has served an apprenticeship under a craftsman but not yet become a master craftsman.
As far as I know Journeyman electrician is roughly similar to Electrician in the JIB scheme, with master electrician being roughly similar to approved electrician in the JIB scheme
Dave in the US you have to have 14,800 primary hours which means being superintendent on jobs then you have to take the masters test. We have guys and girls that can get low voltage license which is under 24vac,swimming pool license, limited license, intermediate license, and of course the Masters license
Not any more, thank God! But you will occasionally see porcelain versions of the wire nuts in stuff that dates from the 60s or before
We also have Ring Circuits that are only really a U.K thing apart from a handful of Asian country's.
In the rest of Europe I think they use more Flex or single core cable the single usually in a flexible conduit.
In the rest of Europe I think they use more Flex or single core cable the single usually in a flexible conduit.
marcuswareham
Arms
In large scale events, In the UK and EU we use a connector called power lock for our temporary installation supplies rated at 400A and 600A (single pole (5 connectors for 3 phase))
Having worked a lot in America you guys use cam lock connectors which like power lock are single pole and rated at 400A
I struggle to understand why they are still allowed & used as they have the potential to be very dangerous: For these reasons:
Powerlock is: locking, will only allow phase to phase or earth to earth connections etc, and has no exposed conductors
I have even seen on TV shoots in the US where camlock is used on a public street and tee adaptors are used as joiners so the side outlet is not used leaving a live exposed conductor on a public pavement.
Although this isn’t a difference in domestic it still might be of interest,
Camlock Tee
Cam lock
Powerlock
Having worked a lot in America you guys use cam lock connectors which like power lock are single pole and rated at 400A
I struggle to understand why they are still allowed & used as they have the potential to be very dangerous: For these reasons:
- Non-locking
- male to male adaptors
- T adaptors
- Any colour can be plugged into any other colour
- Very large exposed conductors easily touched when unplugged
Powerlock is: locking, will only allow phase to phase or earth to earth connections etc, and has no exposed conductors
I have even seen on TV shoots in the US where camlock is used on a public street and tee adaptors are used as joiners so the side outlet is not used leaving a live exposed conductor on a public pavement.
Although this isn’t a difference in domestic it still might be of interest,
Camlock Tee
Cam lock
Powerlock
Marcus I don’t mean no harm but I have no idea what you are saying. If you are talking about lock out tag out a person could lose their job if they don’t follow the correct procedures.
marcuswareham
Arms
No was not talking about lock out tags,
was mentioning observations in how power is supplied for events, in venues in the US (what we meed to plug into)
its basically the same as me saying alot of countries use different plugs, but this one in particular I cant understand for the main fact you can get male to male connectors
maybe it is the wrong place to mention it, if so sorry about that, just find it interesting
No the "cam lock" is the make of connector.
Not quite as stupid a design as the 1/4" jack or phono audio connectors where the signal mates first and ground last, but at least they don't try to kill you! (OK, thy might kill your speakers if volume is up high when changing cables, but that is significantly less serious).
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Cbelectrics
Actually a good thing that was introduced. Was to avoid massive blunders happening in the scientific community where conversions would be made from old imperial measurements to metric. Everything from engineering/satellite's/chemistry (all relatable to electrics).
rubbish. if i see a measurement in inches, i can visualise it. if in cm, then i need to work out 25.4 = 1", so,say, a 25 measurement is stated, but it does not tally. it's 10" less a bit. also,e.g. my tappets on my van engine should be 10 thou. i set at 0.25mm and they rattle.
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Cbelectrics
You and what you are talking about is at the very bottom of the ladder so to speak and you seem to have no understanding of how imperial v metric effects the world around you.
When you start venturing across the fields of physics for instance everything is relatable from a small piece of wire in a satellite to numbers you can’t even count in distances for instance. When you start using physics at the level of powers, conversions matter and mistakes can be made quite easily. When calculating the number of brain pathways in medicine it matters, engineering computer chips it matters.
Scientific units mass (kg) for instance can be a pound of pork scratchings but it can also be used to calculate how to get a spaceship out of orbit. So you have to have harmonised measurements across the board for reasons other than your spanner in a tool box.
Maybe we’re at an advantage, us older members who learned about metric at school, but still had old imperial parents.
We were taught both, and the conversion processes.
You can see how imperial lengths came into being… an inch was the width of your thumb… a hand was basically the width of your hand… used for measuring horses… a foot being self explanatory,
In those days we weren’t building massive skyscrapers, sending rockets to the moon or looking at micron sized particles through a microscope…
We didn’t need that level of definition, so we didn’t use it.
If an engineer or an architect can’t tell the difference between feet and metres, then they’re in the wrong job…
We were taught both, and the conversion processes.
You can see how imperial lengths came into being… an inch was the width of your thumb… a hand was basically the width of your hand… used for measuring horses… a foot being self explanatory,
In those days we weren’t building massive skyscrapers, sending rockets to the moon or looking at micron sized particles through a microscope…
We didn’t need that level of definition, so we didn’t use it.
If an engineer or an architect can’t tell the difference between feet and metres, then they’re in the wrong job…
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Cbelectrics
Totally agree but it still happens.
Here’s a list of some interesting stuff that has gone wrong over the years.
Great miscalculations: The French railway error and 10 others
The discovery by the French railway company that 2,000 new trains are too wide for many platforms is embarrassing, but far from the first mistake of its kind.
www.bbc.com
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Cbelectrics
Double entry 
. See happens to the best of us.
. See happens to the best of us.
I’ve had a quick read, and see an awful lot of “could be the reason” or “one theory” or whatever.
Nothing 100% to say that confusion between metric and imperial was definately THE only factor.
There’s one in there about Big Ben the bell being built…. (Whew!). Way before metric was taken up…
And of course, the media- even bbc- can embellish the truth somewhat to make their articles seem more important.
Nothing 100% to say that confusion between metric and imperial was definately THE only factor.
There’s one in there about Big Ben the bell being built…. (Whew!). Way before metric was taken up…
And of course, the media- even bbc- can embellish the truth somewhat to make their articles seem more important.
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Cbelectrics
That was just an example, think it’s just lazy source confirmation and editing to cover their arse writing the article. The nasa issue was factually correct. So too was a flight from canada and running out of fuel.
Many other factual examples as well as theoretical ones.
One thing I don't understand is why it's still almost impossible to find a tape measure in the UK that doesn't have imperial measurements on it alongside the metric ones, some 50+ years after we 'went metric'. A tape measure that you can't use either way up dives me nuts.
I checked out every tape on offer at the recent Exeter Elex/Toolfair, and found just all metric one - a 5m Stanley, although another supplier sais they would be selling them in the UK 'soon'.
N
nicebutdim
I know a few people who bought metric only tapes and generally they regretted doing so.
Milwaukee make a couple, which is ironic for a brand that used to be American.
I've brought them back from Europe for about the last 30 years, but now, as a result of Covid restrictions and now an extremely aged dog, I've been unable to leave the country for the last three and a half years, and my stock has run out.
I brought back three in 2019, and what I thought was the second one, broke the end of the tape about a month ago. Couldn't find the third one anywhere, hence the search at Toolfair.
About a week and a half ago, while looking for something else, I came across an almost pristine all metric tape - just the bit with the measurements on, neatly coiled up, on a shelf, bound up with green/yellow PVC tape. In an instant, it all came back to me. Tape #2 had been a dud, with the spring securing post breaking after about a week of use, and the one that had just failed was #3 out of 3.
I had totally forgotten that I had saved the nearly new tape, so a few minutes later I had fitted it into #3, and am back in business again with a tape I like the 'feel' of (unlike the new Stanley, which has a very wide tape.)
I brought back three in 2019, and what I thought was the second one, broke the end of the tape about a month ago. Couldn't find the third one anywhere, hence the search at Toolfair.
About a week and a half ago, while looking for something else, I came across an almost pristine all metric tape - just the bit with the measurements on, neatly coiled up, on a shelf, bound up with green/yellow PVC tape. In an instant, it all came back to me. Tape #2 had been a dud, with the spring securing post breaking after about a week of use, and the one that had just failed was #3 out of 3.
I had totally forgotten that I had saved the nearly new tape, so a few minutes later I had fitted it into #3, and am back in business again with a tape I like the 'feel' of (unlike the new Stanley, which has a very wide tape.)
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