just live & S/L conductors in a metal enclosure ?

[streetlighter 1]

Hi

I am installing a Teletask Micros+ metal enclosure

Is it ok to bring just Live and SW Live conductors though a 400mm by 20mm slot cut in the rear of the enclosure ( sometimes cut in the base )

I know I have to bring L N CPC conductors through the same hole but the N and the CPC conductors are all terminated in the large plastic trunking which is mounted underneath the panel to keep it neat & because there is not enough room in the metal panel for them all




Thank you

 

[Rosco]

What if there is a fault and the metal enclosure becomes live??

 

[davesparks]

No you must Earth the metal enclosure

 

[Rosco]

No you must Earth the metal enclosure

That's what I was hinting

 

[streetlighter 1]

thank you for the quick reply

I forgot to say the panel has a 3 core mains flex which powers the power supply which earths the panel & an internal earth bonding point

I was worried about regs ( 521.5.1 Ferromagnetic enclosures: electromagnetic effects )

this is the panel https://www.teletask.be/media/2454/tds10012_en.pdf

Thank you

Paul

 

[Des 56]

I believe that with live only, into and out of the metal cabinet, a magnetic field will be generated around that conductor and circulating currents will be induced into the metal enclosure around the conductor,it could result in a build up of heat if that cable was passing a high current

 

[hightower]

I believe that with live only, into and out of the metal cabinet, a magnetic field will be generated around that conductor and circulating currents will be induced into the metal enclosure around the conductor,it could result in a build up of heat if that cable was passing a high current

Surely if you've a line in and a switched line out the same hole, the magnetic effects of the cables are cancelled out by each other.

 

[Bobster]

I believe that with live only, into and out of the metal cabinet, a magnetic field will be generated around that conductor and circulating currents will be induced into the metal enclosure around the conductor,it could result in a build up of heat if that cable was passing a high current

Only happens when the current returning passes through a separate hole in a ferrous enclosure.

Surely if you've a line in and a switched line out the same hole, the magnetic effects of the cables are cancelled out by each other.

Correct.

 

[i=p/u]

Put a pvc gland on i

 

[stummish]

@hightower is correct. As long as it is earthed and the l and sl go through the same entry it will be fine.