Electrical
Thumb Rules For:
Cable
Capacity
- For
Cu Wire Current Capacity (Up to 30 Sq.mm) = 6X
Size of Wire in Sq.mm
Ex. For 2.5 Sq.mm = 6×2.5 = 15 Amp, For 1 Sq.mm = 6×1 =
6 Amp, For 1.5 Sq.mm = 6×1.5 = 9 Amp
- For
Cable Current Capacity = 4X Size of Cable
in Sq.mm, Ex. For 2.5 Sq.mm = 4×2.5 = 9 Amp.
- Nomenclature
for cable Rating = Uo/U
- where
Uo = Phase-Ground Voltage, U = Phase-Phase Voltage, Um =
Highest Permissible Voltage
Current
Capacity of Equipment
- 1
Phase Motor draws Current = 7Amp per HP.
- 3
Phase Motor draws Current = 1.25Amp
per HP.
- Full
Load Current of 3 Phase Motor = HPx1.5
- Full
Load Current of 1 Phase Motor = HPx6
- No
Load Current of 3 Phase Motor = 30% of FLC
- KW
Rating of Motor = HPx0.75
- Full
Load Current of equipment = 1.39xKVA (for
3 Phase 415Volt)
- Full
Load Current of equipment = 1.74xKw (for
3 Phase 415Volt)
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Single Phase & Three Phase Wire/Cable
Selection
Aluminium Armoured Power Cable 1.5
mm sq to 400 mm sq
Almunium Cable 300 mm sq Current
Cover 400 ~ 450 Amp Load
Almunium Cable 400 mm sq Current
Cover 500 ~ 550 Amp Load