Protection - where to put fuses and breakers

[bobmagnuson]

Now that I've got my router just about squared away, it's time to work on my controller enclosure. Right now it's just a mess of power supplies & wiring.

I've got two power supplies, and a G540. My plan is to put a ITX sized computer, VFD, relay's, etc. in the enclosure as well.

My question is about fusing and breakers...

Where should protection via fuses and breakers take place? Should there be something between the mains and the power supplies? After the power supplies?

Or should I just use wire nuts and keep it simple!?!

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[Al_The_Man]

If you want a neat and professional job, do NOT use wire nuts!
The normal/typical layout has the power entering direct to the main fused disconnect at the top of the enclosure, from there the power can be daisy chained across the top of all the other fuses and then a conductor is taken to each fused unit, whatever that may be.
All heat producing items such as power supplies and transformers are placed at the top of the enclosure.
DIN rail components and terminals makes for a neat installation.
Al.

[bobmagnuson]

Yeah Al, the wire nuts weren't really part of my solution.

My controller will have a fan mounted in the upper left exhausting filtered air brought in at the bottom right. All heat producing items will be placed at or near the top of the enclosure, nearest to to the fan.

I've got access to Din rail and terminals. But I don't yet have fuses or breakers. And I'm not really sure where in the layout they should go.

[Al_The_Man]

In general I place my main AC fuses all together at the top, in some cases where low voltage DC supplies etc are fused on the DC side I will place them locally to the DC output etc.
Attached is a page from NFPA79 for a typical 3phase supplied panel layout.
Al.

[JoeKumanchik]

Also try to keep low voltage signal wiring separated from higher voltage power wiring.


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[RCaffin]

I use an IEC connector for the mains. It has a 10 A fuse inside it.
I use a breaker on the direct-to-mains spindle drive.
I use small circuit breakers between each Gecko 320X drive and its motor.

I have, at various times, popped the lot!

Cheers
Roger