ENA G5/4 -1 Recommendation
Electricity Association Recommendation G5/4-1 - Planning Levels for Harmonic Voltage Distortion and Connection of Non Linear Equipment to Transmission Systems and Distribution Networks in the UK.
Copies can be obtained from the Publications Department:
Energy Networks Association
18 Stanhope Place
Marble Arch
London
W2 2HH
+44 (0) 20 7706 5100