SWA Garden install for registration

[wade88]

Hi guys,

After speaking to Elecsa and asking what would suffice for my registration assessment, i have decided to update the garage CU and run some SWA up the garden to power some weatherproof sockets and a lighting circuit in the shed.

Has anyone got any useful tips or gems of advice for SWA?

 

[DurhamSparky]

practice on an off cut before hand and get it right first time on the real thing!!

 

[Deleted member 26818]

Place the gland cover over a clean cut end of the cable, push it fairly hard and the trim off the end of the cover.
Remove the cover, and slide it onto the cable the corect way round past where you intend to strip it back to, followed by the gland nut.
You can usually get the nut into the cover so it won't slide down the cable whilst you are stripping it.
Use a junior hacksaw to cut through the outer sheath and to score the armour, being carefull not to cut into the inner sheath.
Then flex the cable untill all the scored armour strands snap. A bit of practice on an off cut will be usefull.
Once all the strands have snapped (might have to re-score them), slice through the outer sheath on the part you wish to remove, and remove the unwanted outer sheath and armour.
Then about an inch from the cut sheath and armour, cut through the outer sheath all around the cable and remove the sheath.
Flex the inner cable around and around untill the armour strands splay out enough to slide over the rest of the gland.
Slip the gland on untill the armour strands are just touching the thread and then tighten the nut. You may have to trim some of the strands so all are equal length.
Water tight glands are a bit more tricky, but the principle's the same.

 

[thekingiam]

use some insulation tape wrapped around cable as a guide before cuttting.......do not over cut, if your no good with hacksaw after a few tries you can buy a tool for doing it for you.( blade runner kewtech thingy)

 

[wade88]

Nice one lads. As far as cutting the bugger goes and terminating the cable im pretty happy with that. I was more curious about the best way of concealing and protecting the cable? Is digging in a better method or if applicable, running through some conduit etc? Or do all these variales depend entirely on the lay out of the garden? Because digging in would be a right bitch in my garden (paving slabs all over the shop etc)

 

[wade88]

variables*

 

[wade88]

Spinlondon I just noticed a post you left on the IET forum a moment ago on a similar topic as this. You will have to forgive my lack of knowledge at this point, hence my persistant posts on basic topics on here, but having been looking to purchase the bits i need for this job (again, forgive me) I can only find SWA with either 2 cores (black,red) or 3 cores (blue, yellow, red) or 4 or more etc. So in regards to earthing this SWA run which will be approximately 25 meters down the garden in conduit and broken in multiple places to supply some weatherproof sockets, how do i earth it? Conventionally the armour sheath is used as the earth yes, but if the SWA is coming straight from a 32A MCB within the CU could i use 3 core, and simply sleeve one core with earth sleeve and use this as the earth and the other two as phase and neutral and not use the sheath as an earth at all, simply mechanical protection?

 

[Deleted member 26818]

Yes you can use a core, and sleeve it appropriately, however you would still be expected to earth the armour.
The armour is designed to provide an earth fault path if anything penetrates the cable. It could also be deemed to be an exposed-conductive-part.
I'm supprised that you are only able to obtain SWA in old colours, I hope you are getting it at a substantial discount?

 

[alanl]

Terminate your 3 core SWA in an adaptable box, then run T+E to the CU, like in these pics:

 

[Johnny-G]

Terminate your 3 core SWA in an adaptable box, then run T+E to the CU, like in these pics:
View attachment 4575View attachment 4574

Wiska boxes with the earth clamp are even easier Wiska Earth Clamp Bar for SWA Glands

 

[Spudnik]

Wiska boxes with the earth clamp are even easier Wiska Earth Clamp Bar for SWA Glands

That i like!!!!

 

[ezzzekiel]

and very well priced

 

[kaven]

What is Bridge Rectifier? Let's learn something first. Electricity in a home's power outlet is not in the form that's required by the circuitry inside electronic appliances. At this time, you should use bridge rectifier to change something. Power supplies are circuits made up of various components that convert the electricity that comes from the wall outlet into the various forms needed by the appliance. A bridge rectifier is a common part of those power supplies. It's a bridge-like setup involving four diodes that provides the same polarity of output voltage for either polarity of input voltage.There are something about bridge rectifier.
Converting AC To DC
Many electronic circuits require DC (direct current) rather than AC (alternating current), as well as different voltages than supplied through a home's electric outlet. The purpose of a bridge rectifier is to convert AC to DC, this is also the function of bridge rectifier, and to provide various voltages as needed by the bridge rectifier.
Semiconductor Diodes
A power supply diodeDiodes are semiconductor components that allow electrical current to pass through them only in one direction. If the polarity (the "plus" and "minus") is reversed, current is blocked.
Bridge Rectifier Configuration
Basic schematic for a bridge rectifier circuitWhen four diodes are placed in a certain configuration in an electric circuit and an alternating current is supplied to them, the resulting output is a direct current. This setup is known as a "bridge rectifier" because the alternating current is rectified or changed to direct current
There’s additionally the necessity for inclusion of a voltage divide to determine optimum working voltages to the gate portals of stated multiplicity of said N-channel MOSFET means and mentioned multiplicity of mentioned P-channel means.
The method needs to also have a element to protect the gates of mentioned multiplicity of said N-channel MOSFET means and mentioned multiplicity of stated P-channel MOSFET means from false conduction due to some unauthentic noise impulse voltages channeled to mentioned fill bridge rectifier.

 

[wade88]

im not thinking of using SY cabe instead due its to better flexibility considering i will need to manipulate the cable in some tight spaces and corners etc. SY cable doesnt require the same termination methods though does it? SY can just be wired directly into the CU?

 

[malcolmsanford]

Though it is an acceptable cable IMO I would still go down the SWA route to be honest. If your wanting to use it then as it is on an outside installation I think you should utilise glands that are made for it

CXT Industrial Cable Gland

Remember also you should still earth one end of the cable the same as SWA