Dual shielded 3 core 4mm sq power cable

[Subbu68]

Yes these are pure copper US & IEC connectors. I imported these from Singapore.

just noted that you are using US Type B plugs. Are you using this in India with 240V supply? They may fail for a surge since these are rated for 120V use. If they are not tested and marked for NEMA / IEC wouldn't use them.

And these do not seem to be standard US plug. Type B has a round earth as per NEMA not a U shaped one. some of the surface area for earth terminal is lost.

 

[balavignesh002]

240V supply?

I have from equipments hand carried from Japan 100v (CDP & DAC). Pre amp from US 110v.

I tried using it in 220V devices, it worked flawlessly.

NEMA not a U shaped one.

The ground pin is U shaped one only.

 

[RRR]

tried using it in 220V devices, it worked flawlessly

Are you referring to the cables of 120v or the device ?

 

[balavignesh002]

Are you referring to the cables of 120v or the device ?

The cables with us plugs

 

[Subbu68]

I have from equipments hand carried from Japan 100v (CDP & DAC). Pre amp from US 110v.

I tried using it in 220V devices, it worked flawlessly.
The ground pin is U shaped one only.

Are you referring to the cables of 120v or the device ?

The item in question is the plug that is rated for 120V. It will work on 240V network until a surge from 240V network will puncture it. The insulation is the issue.

I don't know if you are an electrical engineer but I am sure you would understand.

Every electrical equipment if designed and tested to a certain standard, should withstand a continuous rating and an impulse test for the integrity of insulation specified for that. In the US you have NEMA, UK has BS, India has BIS etc. UAE and most ME countries follow BS.

If designed for 120V it will withstand that rating continuously and associated impulse value but will not withstand continuous use at double the rating of 240V in the long run and any surge from the 240V network since a 240/400 V network is designed to tolerate higher surges than 120/230V of the US. Even I would not use a US rated cable in the UAE or India or UK or EU where the voltage is 240/400V.

Wires and plugs specified for these markets have thicker insulation than that used in the US.

Insulation is the issue and it looks silly but no cable manufacturer will use more than required insulation since it is a critical part of any cable and adds to the cost.

If you have stepped down the voltage from 240V for your 120V / 100V equipment your plugs are safe.

Then the transformers of your Japanese or US equipment (generally they have transformers) in the long run may fail since the core could get heated up due to lower operating frequency of 50Hz. Step down transformers cannot change the system frequency. To deliver the same power, the transformers in your CDP or others have to operate at higher flux and since they are designed for 60Hz, the core size will be smaller and will lead to higher flux density and consequent heating >>>> insulation/winding failure. Flux Density B = Φ/A; Φ is flux and A is core cross section. Φ goes up at 50Hz, A remains same as 60Hz, and B goes up to heat the core and winding. Similar effect as pumping higher current through a smaller cross section cable.

The ground pin is not as per NEMA 5-15. It has to be round not U. Hence, I doubt if the plug is certified.

Here you have a link from IEC that gives a brief about world plugs https://www.iec.ch/world-plugs

 

[balavignesh002]

Then the transformers of your Japanese or US equipment (generally they have transformers) in the long run may fail since the core could get heated up due to lower operating frequency of 50Hz. Step down transformers cannot change the system frequency.

Thanks for your input.

I am using 100v equipments for past 9 years with step down and dual servo (100v and 220v). No issues on the electronics so far on the transformer.

 

[Subbu68]

Thanks for your input.

I am using 100v equipments for past 9 years with step down and dual servo (100v and 220v). No issues on the electronics so far on the transformer.

Power requirement of CDP or preamp is not that much and you may not be seeing the impact.

I look for vintage Tuners and amps here in the local used equipment sites to fulfil the teenage / young adult wish to own one. But most of the times I back off since most are are used equipment from the US or Japan import pushed by unscrupulous vendors who get in bulk. I do not want the acrid smoke of a burning transformer in my house.