I am about to renovate my wife's and my office.

I am going to redo all the electrical with new panel and ground wire.

I want to slice the walls that are I guess solid block or red brick in some places.

I want to put the wire in the walls not exposed and the outlets,

I was at Homepro and I want to buy jacked 3 conductor wire to put in the walls .

My question is can I just seal over the wire with cement again or do I need to install conduit to put it in?

Sorry don't have a pic of the wire

Hope I explained it properly

Go for conduit.

It leaves an air space around the wire, good to keep it cooler and it makes it a lot easier to replace if you get a problem.

My question is can I just seal over the wire with cement again or do I need to install conduit to put it in?

Yes, you can. Using conduit is safer, however. The biggest problem you will experience - whichever method you use- will be patching up the cement to match the surrounding surface, if you are concerned about aesthetics.

Good advise, I will go for the conduit it is not expensive.

Another question would what would be better to use the 3 conductor jacked wire or pull 3 separate wires in the conduit ?

I have stones for the grinder to smooth the wall surface, and I won't be counter sinking all the wire only in

The office area were clients come in, the kitchen and other areas will be wall mounted.

Thanks in advance

In my opinion ,cable in conduit is British standard .the pros are to replace or add some more cable in future, the cons are more work and more costly. It is not for safety reason .

Those cable ,what use for above plaster cane be use aso for inside the wall. The isolatin of this cable protect mechanical damage

In conduit use only single wire

Better is to use a circular saw with diamond plate and connect a vacuum cleaner for the dust. If you use a grinder ,your house will be a mess .

Angle grinder with diamond concrete blade works fine, some even have vacuum attachments, mine doesn't but neither does my circular saw. Just make sure that you use the yellow electrical conduit with the gradual 90 degree bends and not the blue pvc water pipe. If you use the water pipe you will never be able to pull the wire around a 90 degree bend.

Using conduit is a safety measure - if, in the future, somebody is drilling to hang a photo or whatever, the conduit will provide some protection, or at least alarm for that. Otherwise, it's at least a potential hazard and screwed for the purpose if the wire is damaged.

In conduit, it doesn't matter whether you use single wires, PVC 2x with ground separate, or PVC 3x.

VAF (double sheath) directly into the wall is not a great idea, as the cable is not rated for moisture - and you can't avoid that because you need to cement over it. For thicker runs like electric water heater where 4mm2 or 6mm2 is required, it's awfully hard to work with too.

VAF is also expensive - the cost of using multiple THW (single core/single sheath) in conduit is not much more than using just multicore VAF alone, but provides added mechanical protection, keeps the wire dry, and also allows you future serviceability.

Agree with all the above, conduit and singles is the way to go here.

In the UK twin-and-earth is run under the plaster, not even chased in to the brickwork and with only a cap strip, but the wall finishes here are much more aggressive to anything buried in them.

I was away when the rough in for my electrical was done. I assume they cut a v-groove for the conduit into the brick/block. And then how is it secured to the wall?

All I can think of is anchors, one hole straps and screws. But this seems too expensive and time consuming for a Thai.

I was away when the rough in for my electrical was done. I assume they cut a v-groove for the conduit into the brick/block. And then how is it secured to the wall?

All I can think of is anchors, one hole straps and screws. But this seems too expensive and time consuming for a Thai.

Ours is held in place by the render, no clips except on corners and in the roof space where there's no render.

Thanks for the advice

I have a circular saw with a diamond blade to cut the wall.

It is only about 8 spots I need to cut so won't be to labour intensive.

I do have many tools to do the work

Will help keep me out of the bar haha

An alternative to chasing out the walls would be to use white trunking which you fix to the wall. Less work, but more visible.

In conduit use only single wire

Why?

In conduit use only single wire

Why?

You ever have try to pull this stiff multicore cable in a 1/2 inch conduit ,it will never go 90 *

Totally agree with the above and make sure that you use the conduit made for electrical installations with the gradual 90 degree connections, not PVC water pipe. Pulling ROMEX (US name) through conduit doesn't work unless you use very BIG conduit!

In conduit use only single wire

Why?

You ever have try to pull this stiff multicore cable in a 1/2 inch conduit ,it will never go 90 *

I will go with a bit of coaxing and care not to stretch the wire. Alternatives are: use larger conduit and/or route through box instead of the corners.

In conduit use only single wire

Why?

You ever have try to pull this stiff multicore cable in a 1/2 inch conduit ,it will never go 90 *

I will go with a bit of coaxing and care not to stretch the wire. Alternatives are: use larger conduit and/or route through box instead of the corners.

or... just use THW

In conduit use only single wire

Why?

You ever have try to pull this stiff multicore cable in a 1/2 inch conduit ,it will never go 90 *

I will go with a bit of coaxing and care not to stretch the wire. Alternatives are: use larger conduit and/or route through box instead of the corners.

The pros of conduit is to change a wire ,if one is broken and a single wire is much more cheaper as multicore

Using conduit is a safety measure - if, in the future, somebody is drilling to hang a photo or whatever, the conduit will provide some protection, or at least alarm for that. Otherwise, it's at least a potential hazard and screwed for the purpose if the wire is damaged.

In conduit, it doesn't matter whether you use single wires, PVC 2x with ground separate, or PVC 3x.

True. I was drilling a wall to screw in some hooks with a steel push drill ( back home- plaster board over wood ) and the bit went into a live wire. Luckily it went between live and earth- the bit melted but I was unharmed. Had it been just into the live wire, that would have been it for me!

Lesson- don't use steel handled drills when you don't know what is in the wall.

An alternative to chasing out the walls would be to use white trunking which you fix to the wall. Less work, but more visible.

Great stuff- I love it. Way better than the Thai method of zillions of cable clips, though they always do them more neatly than I can manage.

I'll never go up in the roof again- it's trunking all the way.

In conduit use only single wire

Why?

You ever have try to pull this stiff multicore cable in a 1/2 inch conduit ,it will never go 90 *

Yes I have many moons ago.

Singles is good for rewire purpose, but will cause more junction boxes, unless you have a full conduit system.

Using conduit is a safety measure - if, in the future, somebody is drilling to hang a photo or whatever, the conduit will provide some protection, or at least alarm for that. Otherwise, it's at least a potential hazard and screwed for the purpose if the wire is damaged.

In conduit, it doesn't matter whether you use single wires, PVC 2x with ground separate, or PVC 3x.

True. I was drilling a wall to screw in some hooks with a steel push drill ( back home- plaster board over wood ) and the bit went into a live wire. Luckily it went between live and earth- the bit melted but I was unharmed. Had it been just into the live wire, that would have been it for me!

Lesson- don't use steel handled drills when you don't know what is in the wall.

BS7671 basically says that if you put the circuitry on a RCBO, you can wire in almost any fashion you want. If the circuitry is not protected by an RCBO, then the cable needs to be buried in a wall 50mm, or have mechanical protection, which would be conduit.

As we are in Thailand, and ALL systems must have a Front End RCD you can do whatever you want.