Does anyone know where I can buy Edison screw light fittings? I want to
change one or two in my house from the regular bayonet cap fittings. I
have looked in the latest Screwfix catalogue and was surprised there was
not even a sniff!
I am presuming there is not legal reason for not changing.
Both ES and BC seem dangerous and outdated.
Looking at the 230v halogen fitting in the bathroom,
the push-and-turn-receptical seems much safer should anyone
want to poke their fingers in it.
Perhaps somthing like that should be designed for GLS and CF
And if a shutter can be incorperated like on MK 13A
sockets then we would have a very safe product indeed.
They do seem that way, but evidence suggests otherwise,
so they are exempt from the normal IP2X requirement
(not being able to touch live parts).
There are apparently no recorded electrocutions due to
the exposed pins in a BC lampholder. There are some
recorded electrocutions from ES lampholders due to
having the thread connection live, which makes the
exposed lamp base live when it's not fully screwed in.
(Many newer designs don't make connection to the thread
contact until the lamp is fully screwed in nowadays.)
It's a newer design -- you would expect it to be safer
and conform to current standards such as IP2X.
It has been for the US which use ES lampholders. (The new
lampholder is a larger version of the push and twist you
refer to above. It's not catching on significanly though.)
Again, you have to point to evidence of any safety problem.
BC lampholder has been around for 100+ years, and if it
hasn't killed anyone in that time, you just can't reasonably
argue it to be unsafe, in spite of the exposed contacts.
(This isn't true for ES lampholders though.)
Can't help agreeing with you, but I recall with some bitterness and chagrin
that back around 1979/80 the BSI spec relating to the length of the BC
plunger contacts was amended, shortening them by a couple of millimetres -
for safety reasons. I had a patent out at that time which was rendered
useless in consequence. It's not the first time the BSI have changed their
regs apparently just for the hell of it.
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