High Frequency wiring in trunking with normal circuits??

[Owen3408]

Hello,
i am having to install 2x 16A commando outlets in a factory that are ran from a generator outputting 127v 3 phase @ 200Hz.
Does anyone know if I can run the 200Hz wiring back into the main trunking to get to the next room (where the outlets are required) which already has normal lighting and power circuits in singles.

Will the difference in frequencies affect each other?

Im thinking that they need to be kept seperate, the trunking run is about 9m

Thanks, Owen

 

[Richard Burns]

I would tend to keep them separate, as 200Hz signals imposed on power or lights could have some odd effects depending on the nature of the equipment installed.
Not sure of any particular regulations for this but a minimum of a barrier interposing would seem sensible.

 

[Brightspark2]

Out if curiosity what is the generator supplying?...

 

[davesparks]

I would ask the people who have designed and specified the installation for instruction on this one, it is clearly a specialist installation and not under the normal scope of 7671

 

[Brightspark2]

I would ask the people who have designed and specified the installation for instruction on this one, it is clearly a specialist installation and not under the normal scope of 7671

The installation of 2 commando sockets?...

 

[Darkwood]

Cannot answer this without a lot more info ... especially;-
The nature of the loads?
What cable you wiring in?
Why 200Hz?

 

[Pete999]

Am I getting it wrong? you are supplying 2 16 amp commando sockets from a supply of 127v @200 hz, hope the sockets are specials, so there is no danger of anyone plugging in a normal 110v appliance.

 

[Knobhead]

We had a small (50KVA) 300Hz 110V 3Ph distribution system. All feeds were run in SWA alongside the standard 50Hz SWA power and control cables. I certainly wouldn’t run 300Hz in trunking with other supplies.

A word of warning:
If the commando sockets are RCD protected check with the manufacturers about suitability. With normal RCD’s the sensing toroidal transformer will saturate and not trip. RCD’s are available but for the life of me I can’t remember the make.
We used HRC fuses instead of MCB’s, again the instantaneous element saturating and not working, the thermal element isn’t a problem.
The commando plugs and sockets should be green.

Are you sure it’s 200Hz, it’s a strange frequency. Not easy to get from a MG set.

 

[Owen3408]

Ok so the company moving into the factory manufacture giant Star Delta food mixers, the equipment in their finishing room takes 127v 200Hz 3phase which comes from a generator/inverter in the plant room next door which runs from a 16A TPN commando socket.
Linking these 2 rooms is a 4x4 trunking supplying other 50Hz TPN and SP circuits in the finishing room along with the fluorescent lighting.
The whole job is all LSF singles in steel trunking and conduit.

the electrical designer has not looked into the high frequency wiring and it has been passed on to us the electrical contractor.:6:

i have the high frequency (green) commando sockets for this ready to go, I just have my doubts about how I can or should wire the circuit and if I need to run additional containment to keep them seperate or run in SWA and if there is a certain type of cable I should be using.

im waiting to hear back from the NIC

 

[Darkwood]

Good luck with the NIC your edging out of the scope of the BS7671 I'll be surprised if they give any informative response.

SWA probably best.. contact all manufacturers of any protection, plug/socket kits etc you are using its suitable for your job (read Tony's post)..

I think you will be the one to do all the phoning around and research here and might be why the designer has washed his hands of it in the first place.

 

[davesparks]

The installation of 2 commando sockets?...

No, the installation of 200Hz supplies. Somewhere near the beginning of bs7671 it says it only applies to supplies at 50,60 and 400Hz I think.

 

[Brightspark2]

No, the installation of 200Hz supplies. Somewhere near the beginning of bs7671 it says it only applies to supplies at 50,60 and 400Hz I think.

Misunderstood the question...I thought he was Installing 2 16A 50hz commando sockets and wanted to know if could run his cables in the trunking with high frequency cables...

Just seen his last post now explaining it all...

 

[Chr!s]

Do we separate power cable which have odd and even harmonics? 3rd 150hz, 4th 200hz, 5th 250hz are common harmonics present. I wouldn't of thought at such low frequencies there would be any issues, you need to be careful around control, id like to thing these would be twisted/shielded, but power cables?

 

[rapparee]

would sy cable not be more suitable for this installation

 

[shanky887614]

would sy cable not be more suitable for this installation

swa would be better, similar price to sysy.

after all sy is designed as a control cable not power, a lot of people use the screen as the cpc even though they shouldnt.

personally id through in a bit of tray/whatever then swa.

saves a lot of time instead of using trunking and tri rated etc