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Domestic wiring fittings, screw heads

Is there a reason why all conventional domestic electrical wiring fittings use exclusively slotted screw heads, rather than the much more practical Phillips or Pozidrive heads? Don't tell me that electricians can only carry one screwdriver?
  • "Has your question been answered?" asks the IET? Well. I've learnt that slot head screws are great because you can line up the heads. With Pozi screws, you don't feel the need to. It would be good to see the IET championing improvements to wiring kit, after all the Wiring Regs are the IET's claim to fame. Decent screw heads, & proper terminals fit for the wires they are likely to be used with. Labeling that is clear & easy to read in poor light.

  • As you can see in the video, many of the screws are not required.
  • Former Community Member
    0 Former Community Member
    My pet peeve when I install say a decorative light fitting, is that the manufacturer (probably assembler) has used up to four different screwdriver head types and two different sized nuts in one fitting! 


    Regards


    BOD




  • In comparison here we have a typical UK consumer unit, I phoned the manufacturer of these several years ago to complain about the low quality of the terminal screws.


    I did the terminal screws up using a torque screwdriver and the threads were so badly machined that I could pull conductors out. I had to tighten up the screws without inserting the conductors using a slotted screwdriver in the plus/minus screwdriver because a pozi  just cammed out, then slacken them off to insert the conductors and tighten them up again with the torque screwdriver, I still wasn’t totally convinced that they were actually torqued correctly.


    The screws are the cheapest components in the assembly and should also be the easiest to source, why they have to be of such low quality is beyond me.


    Andy Betteridge
  • Sparkingchip:



    If you do an image search you will struggle to find a picture of a fitting that does not have the screws aligned, some stood to an attention, some horizontal and a surprising number around two o’clock, but still aligned.


    It's a bit like those pictures of cars you see in sales brochures. The maker's logos on both wheels are always exactly the right way up. You would hardly ever see this in practice - even in a car showroom.


  • Colin Jenkins:

    Hello Alex.

    With all due respects, my view is the exact opposite to yours!  Slotted screws are all easy to deal with.  Get to the awkward inner recesses of a cupboard, roof space or an elevated light fitting only to find find oddball screw heads......b****cks!  Are they Phillips, Pozidriv or Torx?  It sometimes even needs a torch to identify what's lurking in there. The correct driver is vitally important.  Now we need a full suite of four different driver sets for no good reason.  Rant over!

    Regards,

            Colin Jenkins.

             

     


    I am in complete agreement with Colin. My tool belt with the essentials in it is too heavy to wear around my waist due to the number of different drivers in it. I do have a driver with a choice of insulated tips but the handle is large and uncomfortable despite my large hands. If I try to lighten the load the driver I have taken out is the one I find I need when I get to the top of the ladder or worse spent five minutes threading my way through roof trusses to a remote owner of an attic.

    Don't get me started on the screws made of hardened cheese with malformed heads and threads.

    The +/- heads are the worst, the proper driver cams out before the required torque, often destroying the head so I usually  use a straight blade driver. 

    I never use the fitting screws  supplied with accessories as they usually made from soft cheese but unfortunately I do not have the same choice the it comes to the screws for making the connections.

    And how do you work out what driver and of what size is required for that screw at the bottom of the narrow hole where the spider has been busy and there is years of accumulated dust in it and the accessory has been fitted so that you cannot get your head in a position to look down the hole. Aaggghhhh 


    It was all so much easier when there were only slotted  screws :)


    I nearly always align the slots on accessories to five past seven and while I have ADD I do not have OCD :) 


  • My view is the exact opposite, trying not to chew up the head of a tiny slotted screw at the bottom of a dark hole with an ill-fitting driver. At least Pozi stays aligned as you're spinning it.

    I think the consensus is that quality and ease of use have been sacrificed for cost and size reduction.
  • I think that cross-head screws grew in popularity in factory assembly lines, because they worked well with power screwdrivers which were used in the interests of speed and efficiency; the blades were self-aligning. Latterly, power screwdrivers became popular with mobile tradespeople, again for speed and efficiency. Hence cross-head screws have increased in use and availability. However I think most of us would prefer to use ordinary hand screwdrivers to adjust screws on wiring accessories. We have more control and less risk of over-tightening. Hence the straight-slot screw head has persisted here.


    So far I have talked about new screws on new installations. Now wind forward several years. You want to remove the screw, which has become corroded and generally difficult too unscrew. This is where the Phillips often fails; if you are not careful you can round out the cross-grips and be left with an even-more difficult job to remove. I don't have the same problem with straight-blade screws. Indeed, I sometimes saw a straight slot into the screw head so that I can use a straight-bade screwdriver to remove.


    I have a screwdriver whose straight blade became worn to a V shape after it had been used for purposes other than screwing screws (naughty, naughty!). I have not reground it because I found that in this condition it is very effective for removing awkward cross-head screws - far more so than a Phillips driver.
  • Alex Barrett:

    My view is the exact opposite, trying not to chew up the head of a tiny slotted screw at the bottom of a dark hole with an ill-fitting driver. 


    Don’t use an ill-fitting screwdriver, particularly one that has doubled up as a chisel.