Electronics > Power/Renewable Energy/EV's

Is this StepDown Transformer faulty?

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vinlove:
Just bought a new stepdown transformer 230V -> 115V.

But when tested with main socket tester, it lights all three LEDs at the top of the tester, which means "LIVE / GRD Reverse, Missing GRD"
It sounds like the transformer's LIVE and GRD is reverse, and Ground is missing.  Is it serious fault? Should it be returned?

vinlove:
The transformer says "It is not earthed". Could it be problem?

vinlove:
Any ideas on this? Thanks

richard.cs:
That type of transformer has a 110 V centre-tapped secondary with the centre tap earthed, it is not faulty it is just totally confusing the primitive 3-neon tester. The intended purpose of these transformers is to provide a supply for construction equipment used in wet areas where the maximum shock voltage to earth is 55 V and therefore "safe". It's not clear from your photo but I assume you've filled off the plastic key to allow you to plug that blue 240 V plug into the yellow 110 V socket?

The question is more if is this the correct type of transformer for whatever it is you are trying to do?

bjbb:
Let us see if this post gets past the Australian Stasi.

Again, you people need to be very careful when answering questions and commenting on the physics and chemistry of regulatory safety requirements. And am still requesting/begging that Dave find an engineer from his local Certification Body (see the JAS-ANZ listing) and do a series of interviews where they discuss product evaluation and standards scope.

As a technical advisor to the local fire marshal, have seen three house fires (one was a major loss) and two injury incidents during last 16 months where the root cause was a single-fault condition in electrical equipment having construction/materials/performance not meeting code. That is, 'home-engineered' stuff that failed.

The label indicates "Class 1 Construction  This Transformer Must Be Earthed".

It should be marked as 'Class I' because roman and arabic numeric characters have different meanings (yes, this is stupid, but it is how the standards and building codes are written in the western world).

The unit must be connected to a protective earth because the level of protection from shock cannot meet either the withstand requirements, or the insulation coordination requirements, or the overload requirements per whatever safety standard is scoped for this type of transformer (typically IEC61558-x or IEC60076-x).

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