3 phase supply to classroom, unsure to TT?

[westward10]

Probably one of these new eco buildings they have.

 

[Toneyz]

Probably one of these new eco buildings they have.

Not seen one of those (probably not with NCC not having any money) the only ones I've seen is the wooden type in sections.

 

[mpoy222]

What is the mobile classroom made of?

Its all timber, its actually more like a log cabin!

 

[mpoy222]

What is the mobile classroom made of?

Its all timber, its actually more like a log cabin!

 

[westward10]

Nothing eco about them aside from fancy wood fascias which will need replacing in a few years and some led lighting.

 

[davesparks]

Hi there is no CPC being taken fron the main building so i was wondering if the SWA would be sufficient to use as the main CPC. It just has 4 core 16mm SWA

Your use of terminology is confusing, you say there is no CPC and say it is SWA? This is somewhat contradictory!

 

[davesparks]

How do i work out the CSA of the SWA though? There is also a join in the cable with an earth strap in place to keep the continuation of the SWA but i'm assuming thats all its good for.

If you don’t know how to do this are sure you should be doing it without supervision?

What type of joint is it? What do you mean by an earth strap?

 

[Cadgey123]

If you don’t know how to do this are sure you should be doing it without supervision?

What type of joint is it? What do you mean by an earth strap?

I think he means the flexible braid which is connected between the armours with the steel spring bands. God knows what type of joint?

 

[mpoy222]

Your use of terminology is confusing, you say there is no CPC and say it is SWA? This is somewhat contradictory!

There is no seperate CPC. The SWA is earthed but i wasnt confident in using this as a main earth for the installtion of the building because of the join.

 

[mpoy222]

I think he means the flexible braid which is connected between the armours with the steel spring bands. God knows what type of joint?

Thats the one mate. The earth strap in these kits cant have the same CSA as the armour so i didnt want to use it as a main earth. Its a resin joint.

 

[Toneyz]

Is there an existing distribution board in the new building?

 

[mpoy222]

Is there an existing distribution board in the new building?

No its a new building, there was a mobile unit there a few years ago but there was just a cable left over. This building is meant to be more permenant. The cable was just disconnected in the main building DB. It runs under a playground so theres no chance of running a new one or thats the route i would have gone. I've been asked to reinstate the cable and fit a new DB plus a few sockets, lights and water heater for the toilet.

 

[Toneyz]

Ok thanks so all new wiring then.

 

[mpoy222]

Ok thanks so all new wiring then.

Yep everything in the building will be new.

 

[westward10]

So is main protective bonding required.