Need Help Regarding 10kVA Traffo

[Jay]

Hi All,

I will be installing a dual voltage traffo to support a workshop.

The traffo will supply both 110V and 220V DB's that will both have their own circuits.

The customer has requested now that I install an extra 110V Industrial Skt to the existing 110v DB.

My plan is to install an additional 40A MCB which will be protected by the existing RCD without having to increase the kVA rating of the traffo.

Would this be acceptable?

 

[plugsandsparks]

40A MCB for the socket? - must be a big one. Ultimately its a demand question i guess. Only you can answer that but make sure the TX is protected with fuses or MCB for its size and the additional socket is protected with a MCB appropriate for its size and cable. I regulalry see MCBs rated higher than the socket its supposed to be protecting typically 32A MCB on 4sqmm to a 16amp commando

 

[BigAndyB]

Wouldn't it be, for 110v

up to 16A - 1.5mm
up to 32A - 2.5mm

or have i got the wrong end of the stick

 

[Knobhead]

Questions:
Why are you using a transformer to supply 230V?
What protection does the transformer output have?
What is the maximum demand of the boards?
What is this additional 32 socket feeding?
Why are you fitting a 40A MCB for a 32A socket?
What type of RCD are you fitting for the 110V?

Send me a new keyboard, the “?” is worn out on this one.

 

[BigAndyB]

Hi All,

I will be installing a dual voltage traffo to support a workshop.

The traffo will supply both 110V and 220V DB's that will both have their own circuits.

The customer has requested now that I install an extra 110V Industrial Skt to the existing 110v DB.

My plan is to install an additional 40A MCB which will be protected by the existing RCD without having to increase the kVA rating of the traffo.

Would this be acceptable?

Why 220V, surely 230 should be the optimal??

 

[Jay]

Questions:
Why are you using a transformer to supply 230V? The transformer is being used within a 20ft MDT Container which is going to be shipped to Trinidad and the supply voltage from the rig will be 400V therefore I need to step down the voltage.
What protection does the transformer output have? The transformer is suitably protected on both outputs with 20A for 110V and 32A for 220V, the incoming is protected by a 63A Main MCB
What is the maximum demand of the boards? 2kVA for the 110V and 8kVA for the 220V
What is this additional 32 socket feeding? A load according to the customer that will hit a peak of 35A for 1 second which will effect the voltage supply for this duration.
Why are you fitting a 40A MCB for a 32A socket? To Cover this 35A peak and to eliminate nuisance tripping.
What type of RCD are you fitting for the 110V? 30mA D Type

Whats your opinion now of the installation?

 

[Jay]

Bigandyb - Obviously not if the workshop im fitting out is going off to an oil rig but you didnt know that you were just trying to be a smart arse...

 

[Knobhead]

Did I offer an opinion?

Given your attitude I'll keep my thoughts to myself, just as you kept information to yourself.

 

[Jay]

I supplied you with the information you asked for and simply asked for your opinion n the installation in a general way whether you thought it was sufficient.

Its up to yourself if you want to provide feedback or not but I would appreciate it as I'm only a junior engineer trying to make a living.

Thanks Anyway!