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Thy select iss 2 US new 10/25/00 2:29 PM Page 12 Single Phase Load Calculations IL VL = Line to line voltage IL = Line current P = Total power RL = Load resistance cos∅ = VL x IL x cos∅ P= IL= VL RL For resistive loads, cos∅=1.0 RL VL Power factor Three phase load calculations VL = Line to line voltage VP = Phase voltage IL = Line current IP = Phase current P = Total power cos∅ = Delta Connected Load IP IL VL VL IL VP VL Neutral IL IP VP VL I neutral VP VL IP IL IP IL VP VL Power factor Wye Connected Load VP IP VP IP IL IL =IP VL =VP Quick Formula For a balanced delta connected load only: For a balanced wye connected load only: IL = 3 x IP P = 3 x VL x IL x cos∅ P = 3 x VL x IP x cos∅ For resistive loads, cos∅ = 1.0 VL = 3 x VP P = 3 x VL x IL x cos∅ P = 3 x VP x IL x cos∅ For resistive loads, cos∅ = 1.0 To determine the line current (in Amps) for balanced 3-∅ resistive loads (wye- or delta connected) where P = total 3-∅ power in kW: for VL =480V for VL =240V for VL =208V IL = 1.2 x P (in kW) IL = 2.4 x P (in kW) IL = 2.8 x P (in kW) © Copyright Eurotherm Controls Inc 2000 All rights strictly reserved. No part of this document may be stored in a retrieval system, or any form or by any means without prior written permission from Eurotherm Controls Inc. Every effort has been taken to ensure the accuracy of this specification. However, in order to maintain our technological lead we are continuously improving our products which could, without notice, result in amendments or omissions to this specification. We cannot accept responsibility for damage, injury, loss or expenses resulting therefrom. HA136393 Issue 2