2.24kW Pedestal Grinder - protection
2.24kW Pedestal Grinder - protection
(OP)
Wondering if anyone can help me out, we have a 2.24kW pedestal grinder supplied at 440/60/3 - 0.85p.f - would using a 2.5mm2 SWA cable to supply be adequete with a 10A MCB protecting the cable.
calculated the 3 phase current to be 3.5A - anyone suggest/comment on the cable/MCB used. Are these acceptable???
calculated the 3 phase current to be 3.5A - anyone suggest/comment on the cable/MCB used. Are these acceptable???






RE: 2.24kW Pedestal Grinder - protection
motor rated current is 3.5 A at start [or at locked rotor situation] the MCB will not trip in less than 10 sec.
From BS 5467 the continuous load current for 3*2.5 sqr.mm SWA[copper conductor] -ampacity will be 31 A [cable supported by clips at 30 dgr.C ambiant.
This is more than LRC[Locked Rotor Current] let's say 3.5*7=24.5 A
The Voltage drop at start=16 MV/A/m *25 A will be 15% for not more than 150 m cable.
See:
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RE: 2.24kW Pedestal Grinder - protection
RE: 2.24kW Pedestal Grinder - protection
The MCB is adequate anyway.
RE: 2.24kW Pedestal Grinder - protection