Ferromagnetic problem

[Dean Williams]

Merry Christmas all

Getting a bit bored of the festivities so i've been thinking about work.

At the office complex i'm testing, one of the steel MEM 3 phase DBs has each phase entering DB through individual coupling, I know this is not allowed in the regs (reg 521.2.1 i think).

i know it can produce heat and eddy currents etc.

What code should i give this?, 2 or 3?

also, what are the extreme effects of this observation?, has anyone got any experience of past problems due to this. Thanks

 

[Deleted member 26818]

Have the holes been slotted?
Is the gland plate (if any) aluminium?
If none of the above, C2.

 

[Dean Williams]

Thanks.
No slots and the enclosure is solid steel.

 

[scotsparky]

C2 and recoment it to be slotted. I have found a Dremel with a cutting blade is ideal for this and a lot easier than a hacksaw
Dremel 10.8 Lithium Ion Cordless Rotary Tool (With 60 Accessories): Amazon.co.uk: DIY & Tools

 

[Farmelectrics]

c2 is there any heat on gland plate

 

[Deleted member 26818]

Coincidentally, there's a recent thread on the IET's forum about this very subject.
Might be informative for those interested to have a look.