| Motor full load currents |
1. Full load current values are nominal for standard squirrel-cage induction motors of rated
speed 1500 rpm (4 pole).
Possible deviation of FLC values ±10% depending on type and manufacturer.
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| DOL Starting |
| Fuse links |
1. Assumed starting conditions:
| Motor Rating |
Run-Up |
| Up to 1kW |
5 x FLC for 5 secs. |
| 1.1 to 7.5kW |
6 x FLC for 10 secs. |
| 7.6 x 75kW |
7 x FLC for 10 secs. |
| Greater than 75kW |
6 x FLC for 15 secs. |
Operating cycle of 2 starts in rapid succession and up to 8 starts per hour.
2. Suitable adjustments to the recommended rating may be necessary for:
(a) Starting conditions in excess of the assumed starting conditions.
(b) High enclosure (fluid environment) temperatures, refer to fuse de-rating information indicated on page 260.
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| Circuit Breakers |
1. FLC values are nominal for standard squirrel-cage induction motors of rated speed 1500 rpm (4 poles). Possible deviation of FLC values ± 10% depending on type and manufacturer.
2. Circuit breaker ratings are based on carrying 100% FLC continuous and 600% FLC for 10 seconds. Operating cycle 2 starts in
rapid succession and up to 8 starts per hour.
3. Suitable adjustments to the indicated ratings may be necessary for:
a) Starting conditions in excess of the above conditions.
b) High enclosure (fluid environment) temperatures.
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| Assisted Starting |
| Fuse links |
1. Assumed starting conditions:
| Motor Rating |
Run-Up |
| Up to 1kW |
2.5 x FLC for 20 secs. |
| 1.1 to 7.5kW |
3.5 x FLC for 20 secs. |
| Greater than 75kW |
3.5 x FLC for 15 secs. |
Operating cycle of 2 starts in rapid succession and up to 8 starts per hour.
2. Suitable adjustments to the recommended ratings may be necessary for:
(a) Starting conditions in excess of the assumed starting conditions.
(b) High enclosure (fluid environment) temperatures more than 35°C. Some fuses need
to be derated as indicated on page 260.
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| GE Circuit Breakers |
1. FLC values are nominal for standard squirrel-cage induction motors of rated speed 1500 rpm (4 poles). Possible
deviation of FLC values ± 10% depending on type and manufacturer.
2. Circuit breaker ratings are based on carrying 100% FLC continuous and 600% FLC for 10 seconds. Operating cycle 2
starts in rapid succession and up to 8 starts per hour.
3. Suitable adjustments to the indicated ratings may be necessary for:
a) Starting conditions in excess of the above conditions.
b) High enclosure (fluid environment) temperatures.
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| GE Contactors |
1. FLC values are nominal for standard squirrel-cage indication motors of rated speed
1500 rpm (4 poles).
Possible deviation of FLC values ± 10% depending on type and manufacture.
2. Contactor types based on the following conditions:
a) Starting duration not more than 20 seconds.
b) Starting frequency of 2 starts in rapid succession and up to 8 starts per hour.
3. TOL relays selected for direct connection to the line contactor, in the delta branch of the
motor starter circuit.
4. Suitable adjustments to the indicated types may be necessary for:
a) Starting conditions in excess of the above conditions.
b) High enclosure (fluid environment) temperatures.
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| Auto Transformer Starting |
| GE Contactors |
1. FLC values are nominal for standard squirrel-cage indication motors of rated speed
1500 rpm (4 poles). Possible deviation of FLC values ± 10% depending on type and
manufacture.
2. Contactor types based on the following conditions:
a) Starting duration not more than 20 seconds.
b) Starting frequency of 2 starts in rapid succession and up to 8 starts per hour.
c) Auto-transformer tap at 80%.
3. Suitable adjustments to the indicated types may be necessary for:
a) Starting conditions different to the above conditions.
b) High enclosure (fluid environment) temperatures.
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| Fire Pump Starting |
| Fuse Links |
1. FLC values are nominal for standard squirrel-cage induction motors of rated speed 1500 rpm
(4 pole).
Possible deviation of FLC values ±10% depending on type and manufacturer.
2. Recommend fuse ratings are based on carrying 125% FLC continuously and operating in not less
than 20 seconds at 600% FLC, in accordance with Clause 7.2.9.2 of AS/NZS 3000:2007.
3. Suitable adjustments to the recommended ratings may be necessary for high enclosure (fluid
environment) temperatures, refer to de-rating information indicated on page 260.
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| Circuit Breakers |
1. FLC values are nominal for standard squirrel-cage induction motors of rated speed 1500 rpm (4 poles). Possible deviation of FLC values ± 10% depending on type and manufacturer.
2. Circuit breaker ratings are based on carrying 125% FLC continuously and opening in not less than 20 seconds at 600% FLC, in
accordance with clause 7.2.9.2 of AS/NZS 3000:2007.
3. Suitable adjustments to the indicated ratings may be necessary for high enclosure (fluid environment) temperatures.
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