Continuous duty
Connect rated current requirements to load calculations, diversity and expected operating conditions.
Engineering guide
Define electrical ratings
Prepare the voltage, current, frequency and fault-duty inputs needed for equipment selection.
At a glance
Define electrical ratings
Ratings should come from the project electrical design and be stated together with the operating context. Unknown values can be marked for discussion instead of estimated.
Equipment selection
Match the equipment to the electrical system
Ratings should come from the project electrical design and be stated together with the operating context. Unknown values can be marked for discussion instead of estimated.
Project information
- Nominal and highest system voltage
- Frequency and phase arrangement
- Continuous current by circuit or section
- Prospective short-circuit current and duration
- Insulation or impulse requirements where specified
Selection details
Key considerations for this application
Fault duty
Provide the calculated fault level, clearing time and the location at which the value applies.
Project basis
State the applicable project specification and any mandatory client or market requirements.