Loft board, cable and partition wall.
Discussion
Is the partition wall in the loft or below? I am assuming it is below and the wooden floor is above it in the loft and that you are trying to get the cable under the floor in the loft rather than into a wall in the loft.
If you can't remove the floor from one end or move it enough then keep it in position, drill a hole in the floor using a hole saw that is reasonably large, remove the cut out from the cutter so that it can be refitted afterwards. Once the cable is in you can then put a baton of wood across the hole ( the piece of wood is longer than.the hole is wide, by putting it in on an angle it will go into the hole), put another baton of the same size into the hole.
Put your hand into the hole and lift up the baton so that it sits flat against the wooden floor, to one side of the hole and screw into place with a screw from above the floor(may need countersinking), repeat at the other end of the piece of wood, then repeat with the other wooden batten, both pieces of wood should run in the same direction to form a support for the previously removed piece of floor to be sat onto before screws ar used to fix it to the battens.
If you are any good with a router there are other ways to do similar
If the cable needs to move further under the floor and no joists are in the way get a piece of minitrunking and use the lid to slide under the floor
Eta is the wooden board on the Walls and floor in the loft
If you can't remove the floor from one end or move it enough then keep it in position, drill a hole in the floor using a hole saw that is reasonably large, remove the cut out from the cutter so that it can be refitted afterwards. Once the cable is in you can then put a baton of wood across the hole ( the piece of wood is longer than.the hole is wide, by putting it in on an angle it will go into the hole), put another baton of the same size into the hole.
Put your hand into the hole and lift up the baton so that it sits flat against the wooden floor, to one side of the hole and screw into place with a screw from above the floor(may need countersinking), repeat at the other end of the piece of wood, then repeat with the other wooden batten, both pieces of wood should run in the same direction to form a support for the previously removed piece of floor to be sat onto before screws ar used to fix it to the battens.
If you are any good with a router there are other ways to do similar
If the cable needs to move further under the floor and no joists are in the way get a piece of minitrunking and use the lid to slide under the floor
Eta is the wooden board on the Walls and floor in the loft
benbob said:
dibbers006 said:
I need to drop a cable from the loft to the floor downstairs through the middle of a partition wall.
Dropping a cable like that does not meet the regs.Or is it a case of you used to be allowed to do that, but not any more?
Fatboy said:
benbob said:
dibbers006 said:
I need to drop a cable from the loft to the floor downstairs through the middle of a partition wall.
Dropping a cable like that does not meet the regs.Or is it a case of you used to be allowed to do that, but not any more?
If it is a mains cable, it should be installed as below.

The main change in the regulations is that if you install the cable in a prescribed safe zone, it has to be RCD protected (in a domestic property). If you use methods i to iv, it need not be RCD protected, although there may be another reason why RCD protection is needed (such as general socket outlets, installations in bathrooms etc.). Previously an RCD was not required if the cable was run in a safe zone.
Personally, I would never run a cable other than in a prescribed safe zone, even if it was mechanically protected or buried greater than 50 mm.
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