twin

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. In rare cases twins can have the same mother and different fathers (heteropaternal superfecundation).
In contrast, a fetus that develops alone in the womb (the much more common case, in humans) is called a singleton, and the general term for one offspring of a multiple birth is a multiple. Unrelated look-alikes whose resemblance parallels that of twins are referred to as doppelgƤngers.

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  1. Marvo

    Flat twin cable with sheathed CPC.

    I see they're introducing a new type of flat twin cable with a sheathed CPC. In my location there's no requirement to sleeve CPC/bonding conductors and you never see it done. We just install and arrange wiring in enclosures or DB's in such a way that there's no realistic chance of the...
  2. ak247fox

    Can i use 6mm twin and earth with wago 5 way to wire up a double plug

    I had to replace a surface plug socket box after the plasterer destroyed the old stuff. It has black, red and earth wire, 3 of each and look quite thick (the earth wire looks like it should be used for barb wire abd isn't covered) Sticking all of that into a new faceplate isn't working so well...
  3. zaceverett

    Twin immersion same circuit?

    I've purchased a horizontal unvented cylinder that has come with 2 immersion heaters. I was hoping to use the same circuit the my existing tank used. What's the best way to wire in for 2 immersions? Upgrade the 2.5mm radial? Any suggestions welcome
  4. Mark Wright

    Twin and Earth American style

    Can anyone tell me more about Twin and Earth American style? What's it's full name? NM? Is it always flat? Do you add a sheath to the ground/earth cable? Thanks šŸ˜Š
    • Mark Wright
    • Thread
    • american earth style twin twin and earth
    • Replies: 41
    • Forum: USA
  5. K

    Terminating a live twin and earth inside a wall.

    Hi guys I'm looking for some advice. I have recently removed a wall socket that we no longer need, and have wrapped the individual Live, Earth and Neutral wires in electrician's insulating tape, and then wrapped the end of the whole cable in insulating tape, before cementing it back into the...
  6. A

    Correctly closing off a dead twin and earth cable in a loft.

    Correctly closing off a dead twin and earth cable in a loft. My old house used to have radial circuits serving night storage heaters. Those radials came from a dedicated consumer unit in the garage which has now been removed and all cables from it are now dead. Each night storage heater was...
  7. T

    How to terminate Twin & Earth Cable (put end cap etc)?

    Hello, I wanted to know how do you terminate (put end cap) on a Twin & Earth Cable? I've been searching for caps but they are more of connectors than end caps. I've some spare WAGO 222-412 2-Port Lever Cage Clamp Terminal Block Connectors, can I put one in each cable, see image. If not then...
  8. R

    Grundfos Magna1 twin pump control

    Hi to all, I have got dual pump set Grandfos Magna1 installed. Those pumps can be constantly running when paired wirelessly. However, I would like to be able switching them on and off separately, for example 3 hours pump1 is running then pump2 for another 3 hours. To achieve that I assume...
  9. W

    IMIT TWIN THERMOSTAT (LONG PROBE) Wiring diagram

    IMIT TWIN THERMOSTAT (LONG PROBE) hi just wondering if anyone can explain the wiring diagram for this thermostat. The question has been asked before but I can get the information I need. I have asked an electrician but heā€™s unsure.
  10. C

    Outdoor twin light switch wiring

    Hi, Apologies for lack of knowledge but here goes. I have an outside supply that goes to a twin switch operating a light and a water feature. I had to change the conduit position and the old switch which was damaged - now nothing works. I put a new front on the switch but am confused as to...
  11. W

    I want to join an 8mm flat twin cable to a 6mm round twin.

    I am looking to join 2 cables for an outside security light. The mains cable on the existing light is 8mm flat twin. But the new light is a 6mm round twin. I can't rewire as it goes into the wall to the socket. So was looking at an ip66 connection. But can't find one that does both sizes. Any...
  12. S

    6kw appliance - 3phase warehouse 13A twin sockets

    Hi Lads, You might think i'm a di*k already from the forum title but I desperately need some help. I've got a small business and if I wasn't skint, i'd obviously have an electrician come to advise me. I added some kitchen equipment to the warehouse - most of the equipment can plug in to the...
  13. Y

    Diy extension lead 2.5mm twin &earth?

    Hi guys I'm needing new extension lead to power light and music centre and have plenty excess 6mm & 2.5mm and 6metres 1.5mm grey twin and earth cable, plugs, sockets and grommets etc. Have basic knowledge of electrics just wanting opinions on using 2.5mm twin and earth cable a new 13 amp plug...
  14. M

    Twin and Earth 2.5mm - From tool station

    Hi all I was in need of some 2.5mm twin and earth for a spur, was passing tool station and called in. Got Twin & Earth Cable (6242Y) Grey 2.5mm2 x 25m - But when looking at the cable its got written on it: 2.5mm + 1.5mm. So it looks like the live and neutral is 2.5mm but the earth is 1.5mm...
    • mds1256
    • Thread
    • 2.5mm earth station tool twin twin and earth
    • Replies: 4
    • Forum: DIY Electrical Advice
  15. D

    240v twin capaitor motor wiring?

    Hi.i purchased a motor for my metal buffing machine.Its now anti-clockwise wired..but on the diagram..it only shows where one cap should go.its fitted with two.one slightly larger than othercan only read markings on one...Its a western electric brand.tried contacting them direct for help to no...
    • Dany
    • Thread
    • 240v attach diagram fitted motor twin wiring
    • Replies: 16
    • Forum: DIY Electrical Advice
  16. G

    Can I put a piece of twin and earth on some concrete?

    Hi, I need to put a new socket on a wall in my living room, it will spur off and existing socket and it is my closest option (nothing upstairs either), the thing is there is a door way in the way. Instead of going up and over the door am I ok to channel a small path in my concrete floor and...
    • g0nz0uk
    • Thread
    • concrete earth piece twin twin and earth
    • Replies: 17
    • Forum: DIY Electrical Advice
  17. S

    Replacement twin grill element not working - other possible causes?

    The grill element blew the other day and I ordered and received a new one, fitted it and it's still not working. Could it have blown something else withing the cooker? All 4 wires are connected but there's no heat. The grill fan is working. I am stumped. The cooker is listed as a Hotpoint UY46...
    • stoutlad
    • Thread
    • cooker electrical work element grill not working other possible replacement resistance twin working
    • Replies: 11
    • Forum: DIY Electrical Advice
  18. G

    RCD Protecting Twin & Earth Sub Main

    Hi first post here, did have a search around but couldn't find previous posts that answered exactly what im after. Had a look at a friends electrical wiring this eve and trying to advise them, as they are now unsure of the "future proofing" they have done would be compliant. (Im not a sparky...
    • gupster
    • Thread
    • circuits distribution earth house main rcd sub main twin twin & earth
    • Replies: 14
    • Forum: DIY Electrical Advice
  19. F

    LAP (Screwfix) twin and earth

    Good evening all, Anyone used any of this yet? Reason I ask is that it's on offer at the minute, 2.5mm 100M for Ā£47. Apparently it's made by Prysmian so should be OK would you think? LAP 6242Y Twin & Earth Cable Grey 2.5mm x 100m | NoLinkingToThis Chris
    • FAA Greenie
    • Thread
    • cable can't earth problems screwfix twin twin and earth
    • Replies: 8
    • Forum: UK Electrical Forum
  20. A

    Dewalt 10.8V twin pack at Screwfix

    Hi Guys, Anyone used either of these drills in the Dewalt 10.8V twin pack at Screwfix? http://www.*************/p/dewalt-dck211s2-gb-10-8v-drill-driver-impact-driver-twin-pack/55341?cm_mmc=Email-_-E12W13C-_-Standard-_-DeWaltTwinPack Special offer at Ā£150 at the moment. Thanks for any feedback
    • alexknight0602
    • Thread
    • dewalt screwfix twin
    • Replies: 13
    • Forum: UK Electrical Forum

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