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cazzesman

Isolation Transformer

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40 minutes ago, rmpfyf said:

Did you end up getting  circuit showing your earth routes?

 

Would have considered having the breakers protrude through the case flush so you can make safe before opening. 

 

Can't see from the photo, is the case earthed?

1. No

2. Considered it.  Thought it was safer locked in box like a normal switch board

3. Yes

 

Regards Cazzesman

 

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11 minutes ago, cazzesman said:

1. No

2. Considered it.  Thought it was safer locked in box like a normal switch board

3. Yes

 

Regards Cazzesman

 

  1. Get it, and print the schematic on the side of the box. It must show earth routes.
     
  2. It's not. What you have is like needing to remove the switch board covers prior to resetting a breaker. Technically under those covers you are potentially operating in a live environment, which is a big no-no. I'm not sure the purpose of the supply side breaker; it's effectively an on/off switch that you need to remove the covers for to be at all effective, and if it's a load protection device purely then the load side RCBO should suffice if sized correctly, no? Consider also that you can isolate the load side but still have a live transformer, which can be the last mistake anyone ever gets to make.
     
  3. Earthed to supply side, load side or both?

 

Again, not a ticketed sparky, seek independent advice. 

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The good news is when you're done you'll have been a pioneer for the rest of us :D 

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Please ensure the metal case is earthed securely with the yellow/green earth wire coming from the mains input side.  The earth should be crimped or soldered securely onto a full loop lug that is securely attached to the case with a shake proof washer and double nutted or use a Nyloc TM nut so that the lug can't possibly become loose.  You can extend the earth connection to other parts of the circuit thereafter.

 

Cheers,

Alan R.

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13 minutes ago, cazzesman said:

https://www.appliancetaggingservices.com.au/electrical-safety-standard

 

A qualified Tag and Tester will go through the checks tomorrow as per the above link.

 

Note the items tested.

 

Regards Cazzesman

 

 

That's good and proactive. That should get your earth leakage tested, if there's a path to mains have the tester go through it with a multimeter to prove out the route for you.

 

Bear in mind certain isolation transformer configurations are required instead to have a breaker, not an RCBO, acting simultaneously on live and neutral (e.g. a test and tag won't prove much). Have 'em tell you how she's wired and draw up a quick schematic. 

 

Would ask whether it's earthed with best practice, your pic is low res and it's hard to make out but I'd suggest the trans cage is earthed via a lug at the top and to chassis through the trans mount, though the trans may be mounted rubber isolated (?) which you'd fix up fast with @Monkeyboi's suggestion and, if you want to be perfect, a wired connection between lid and main case. 

 

Moral of the story is just to know what you've got.

 

When all done you'll have the cheapest 2kVA iso trans going. Next is a hot filter!

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No rubber mounting.  IsoTran connected directly to the metal box.

 

Regards Cazzesman

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9 hours ago, cazzesman said:

No rubber mounting.  IsoTran connected directly to the metal box.

 

Regards Cazzesman

 

Good. Let us know how today goes. That trans is a nice unit, and that case leaves you room for a filter....

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For those interested here are my costings.    Approx on items rounded up or down.

 

560.   Isotran - delivered

20.     Metal Case from Bunnings 

20.     5 mt 15amp Power cable

15.     6 socket power board

40.     Metal vents

20.     Assorted screws 

5.       Circuit breaker

30.     RCBO

10.     2 x Circuit breaker covers

20.     Metal sheet

 

$740.   Total.    When you consider some power cables on SNA are selling for that price I’m happy with DIY cost for the return and SQ benefits.

 

Regards Cazzesman

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@cazzesman Airlink sells their 2kVA for A$772 though that's not shipped, no RCBO, not an EI trans, and no joy of doing it yourself. 

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@cazzesman you'd have to wonder whether a filter would make a difference - should be positive as long as your equipment isn't mains impedance sensitive.

 

There's IP2x stuff like the aforementioned Thor DRM95's, or going a little more bare you could probably source some PCB solutions (what Airlink uses in their top-end isol trans - Avery Magnetics filters - are much like this). 

 

But that'd pretty much be it! 

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Woohoo!!!!!!  

 

Regards Cazzesman

 

😀🤙🤙😀

IMG_3231.jpg

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10 hours ago, cazzesman said:

SQ benefits.

What did they end up being?

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Hi Ittaku see page 1 half way down.

 

Regards Cazzesman

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I must admit I'm perplexed as to why you went to all the trouble of importing a 2kVA from Germany when there are many excellent manufacturers here.

Now that you have a metal case, please make sure the case is also earthed.

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On 21/01/2019 at 2:06 PM, A9X said:

I must admit I'm perplexed as to why you went to all the trouble of importing a 2kVA from Germany when there are many excellent manufacturers here.

"extremely low inter-winding capacitance" is the justification used.    It is not often optimised, or quoted as a spec.

 

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