phases through separate openings

[mick1974]

I know you should put all three phases and neutral through the same opening of enclosures and not split them(two in one hole and one and neutral in other).
But i can't find the regulation for this.

 

[Marvo]

Eddy currents unless you slot between the holes with ferrous enclosures.

 

[telectrix]

as marvo says. it's only with ferrous enclosures that you may get eddy currents. thanks for reminding me. eddy owes me a tenner from a bet.

 

[Sharpend]

That's eddy currency, tel slight difference!!

 

[telectrix]

ah, like market and meerkat. sssimplesss.

 

[Silly Sausage]

There aren't regs for electrical theory, it's stuff you 'should' know!

 

[trebor]

Regulation 521.5.1 BGB is the reg but it does not tell you why, but we all know why dont we

 

[skirby]

Yep- 521.5.1 Ferromagnetic enclosures: electromagnetic effects
The conductors of an a.c. circuit installed in a ferromagnetic enclosure shall be arranged so that all line conductors and the neutral conductor, if any, and the appropriate protective conductor are contained within the same enclosure.
Where such conductors enter a ferrous enclosure, they shall be arranged such that the conductors are only collectively surrounded by ferromagnetic material.

 

[amo]

Only in metal (ferrous) enclosures

 

[Engineer54]

Only in metal (ferrous) enclosures

That's not actually a correct statement!! Drive enough current through an alluminium plate and you will still see circulating currents being produced, not as pronounced as in a ferrous metal situation, but depending on current flow, can still reach detrimental levels!! I always replace all switchboards alluminium gland plates with paxoline (or equivalent) gland boards. Many of our switchboards will be seeing potential loadings approaching 2.5 to 3.2 KA through incoming parallel single core cables!!

 

[mick1974]

Thank you for all for help , like I said I know you can not do it but I needed to dig out the reg

 

[SirKit Breaker]

I know you should put all three phases and neutral through the same opening of enclosures and not split them(two in one hole and one and neutral in other).
But i can't find the regulation for this.

Its in part 5, but i cant remember the reg either, and it is worded in the usual garb, so not so easy to dig out.