Led, heated mirror with a shaver socket

opps · 14 Jul 2019

SWMBO wants the above which will sit above the (to be fitted) bathroom basin.

Is it oK to run it off the permanent live in the lighting ring or do I need to have a fused spur somewhere? The mirror hasn't been purchased yet so all I have to to work off is the diagram showing the cable position where it will pop out of the tiles. The tiler starts on Tuesday so I need to do my chases tomorrow morning.

Additionally, if I decide to use flex, what diameter should I be looking at?

Here is the mirror.

https://www.lightmirrors.co.uk/bath...rgent-wide-led-light-bathroom-mirror-502.html

It doesn't mention that it is double insulated so I assume that I will need flex with an earth. That said, as a matter of course, I would rather that the supply will have an earth, even though my consumer unit only has MCBs rather than RCDs.

Many thanks, opps.

EFLImpudence · 14 Jul 2019

opps said:
Is it oK to run it off the permanent live in the lighting ring

Yes. (Lighting will not be a ring. Ring is not another word for circuit.)

or do I need to have a fused spur somewhere?

No.

Additionally, if I decide to use flex, what diameter should I be looking at?

Get 1mm² cross-sectional-area conductors. The sizes are not diameters.

It doesn't mention that it is double insulated so I assume that I will need flex with an earth. That said, as a matter of course, I would rather that the supply will have an earth, even though my consumer unit only has MCBs rather than RCDs.

All fixed cables must have an earth wire.

RCDs don't need an earth; they are for situations when YOU are the earth - but,

for new work the circuit should/must have an RCD.

opps · 14 Jul 2019

Many thanks, much appreciated, oh, and thanks for the clarifications.

EFLImpudence said:
Get 1mm² cross-sectional-area conductors. The sizes are not diameters.

Sorry, am confused, what is the difference between the cross section of a circular/round conductor and the diameter (of the said conductor? Perhaps you assumed that when I asked about the diameter of the flex I was referring to the diameter of the flex including the insulating material- I was referring to the diameters of the conductors in the flex.

EFLImpudence · 14 Jul 2019

opps said:
Sorry, am confused, what is the difference between the cross section of a circular/round conductor and the diameter (of the said conductor?

The cross-sectional area of a conductor is the area of a cross section of it.
The diameter is the length of a line across it passing through its centre.
Think of both as a circle.

The area is the radius (half diameter) squared times Pi (3.1415926535897932384626433832795)
The area of a conductor with a diameter of two mm. is 3.1415926535897932384626433832795 square mm.

A 1 square mm conductor has a diameter of 1.13mm.

https://www.diynot.com/wiki/Electrics:flatpvccables

Perhaps you assumed that when I asked about the diameter of the flex I was referring to the diameter of the flex including the insulating material- I was referring to the diameters of the conductors in the flex.

I did - but it's the same difference.

flameport · 14 Jul 2019

opps said:
what is the difference between the cross section of a circular/round conductor and the diameter (of the said conductor? P

Diameter is the length of the red line.
CSA is the area shown in green.
Two entirely different things.

Cables are specified by csa, not diameter.

opps · 14 Jul 2019

Duh, thanks guys.

I now get it, although EFLImpudence clearly said "cross section area", my brain interpreted that as "cross section".

Feeling a tad silly now, for what it is worth I did take my A'level maths a year early and studied advanced calculus as part of my economics degree. I blame my english teacher

chivers67 · 14 Jul 2019

https://www.illuminated-mirrors.uk.com/bathroom-cabinets/demister-cabinets.html we bought one of the cabinets off this site rather than just a mirror with a shaver socket

opps · 15 Jul 2019

chivers67 said:
https://www.illuminated-mirrors.uk.com/bathroom-cabinets/demister-cabinets.html we bought one of the cabinets off this site rather than just a mirror with a shaver socket

Tnx. She has already ordered the mirror. Originally she wanted a 500*700mm recessed mirrored cabinet but I told her I wasn't happy with the idea of digging out 5" of a 9" external thermolite wall.

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Led, heated mirror with a shaver socket

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