Electromagnetic fields is Skyscrapers

[medidot]

High buildings power supply currents are very high and can reach arround
10,000 Amps in 30 floor building if the voltage is 230/400 volt ( as used in Europe and Israel ) . The high currents emit very high Electromagnetic fields arround the peer of the building . In the USA the currents suppose to be twise . I asume that in skyskrypers the power supply is in high voltage lo lower the currents . Somebody can help me to learn the typical power supply of Skyskrypers . What is the supply voltage of the main lines and if there are transformers along the peers . Thank you in advance .