As per current terminology in Malaysia and as per standard practise for most Commonwealth country, voltages less than 1000V are termed as Low Voltage, between 1000V to 300kV are termed as High Voltage, those between 300kV to 765kV are termed as Extra High Voltage (EHV) and those greater than 765 kV are termed as Ultra High Voltages (UHV)
I went to Wangsa Walk Mall last Tuesday and found the warning sign of high voltage. I don't think the decoration above require any high voltage supply. To put high voltage level warning is confusing and could misleading.
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