No because the pins are positioned in such a way so as to ensure that only the correct plug type can be inserted into the corresponding socket. They are also colour coded to reflect the service voltage: Yellow 110v, Blue 230v and red 400v. The number of pins corresponds to the requirement of the machine you are trying to power. Typically 3-pin will be single phase (L,N,E), 4-pin will be 3ph + Earth (typically motors) and 5-pin will be 3ph + Neutral + EarthDoes a 3 or 4 pin 3 phase plug fit into a 5 pin socket ?
In a word, yes.Thanks, had a check and there's four wires, so I just wire the four into the correct terminals of the five pin plug ?
But you can purchase "armoured flex" as well, which is produced with stranded cable, finer armour strands and a more flexible sheath.Just a comment, SWA is not a suitable cable for termination into plugs and use as an extension lead.
I believe that you are referring to SY cable, with the clear outer sheath, and it is NOT armoured flex.But you can purchase "armoured flex" as well, which is produced with stranded cable, finer armour strands and a more flexible sheath.
However if you got some, and failed to earth the armouring strands, the benefit of the armouring would be reduced and induced currents could do bizzare things elsewhere.
This I was unaware of, and I have been sold SY as "armoured flex" by reasonably reputable electrical distributors in the past when I've gone in for 3ph+E flex, so there's clearly a misunderstanding which is somewhat common and actively being spread there.I believe that you are referring to SY cable, with the clear outer sheath, and it is NOT armoured flex.
Nevertheless, I've seen it terminated into CEEForm 3ph+E and 3ph+N+E plugs (so IEC 60309, not BS1363) fairly frequently in existing installations.There is also, no recognised acceptable method for termination of SY (or CY) cable into a BS 1363 plug.
I can certainly see the issue there if someone was to use 3 core SY and treat the control braid as earthing in that case.The braid in SY (& CY), is for EMC screening/control, and is not designed by the cable manufacturer to take full fault current in relation to the core size as a correctly specified SWA would.
That sounds familiar enough, there was an analogous situation with GRP process piping and pressure vessels, where the BS standard was withdraw as depreciated because it didn't guarantee compliance with all design requirements in the most recent Pressure Equipment Directives...Also, SY cable is in some dispute at the moment, as it has no recognised British Standard for manufacturer, and the standards quoted by many of the cable makers are a little irrelevant to the overall performance, for example one cable OEM quotes a German DIN standard which refers only to the flame propagation of the insulation, nothing else, another often. quote DIN standard number is in fact for a series of standards many of which are not directly related to the cable performance in use.
There are SY cable manufacturers who are going through the process of getting their cable recognised, but their issue is that there is no international standard (IEC), for SY, so there is nothing to validate the cable against.
As a Chemical/Process Engineer I normally stop at the control architecture and expected electrical loads, then leave the finer details like that to someone such as yourself who is "Suitably Qualified and Experienced".Being an “approved” electrical contractor, TUV Certified Machinery Safety Expert, and also running my own engineering company doing primarily design and consultancy for other electrical contractors, machine builders and end users, accompanied by a smattering of I&T, build works, modifications and maintenance on machinery and electrical installations, I have to be pretty au fait with the various wiring materials and thier correct application.
Not withstanding, to ensure that there is no mistaken interpretations.I can certainly see the issue there if someone was to use 3 core SY and treat the control braid as earthing in that case.
However I have been advised in the past that it is good practice to connect all unused conductors in cables to earth at both ends, by people more skilled in the art than I.
If you feel that's bad advice, I will consider my advice updated.