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While designing the resistance
elements and enclosures following considerations are kept
in mind:
- Degree of protection as per IS: 2147
- Outdoor / Indoor
- Duty rating as per BS: 587
- Ambient temperature of surroundings
- Permissible temperature rise above the ambient temperature
- Environmental and site condition
- Voltage rating
- Natural / forced cooling
- Current rating & Ohmic value according to application
- Material of resistance, resistivity and temperature
co-efficient
- In case of Motor Control; Speed torque curve is
also considered
- Any other special requirement of customer
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