A plant load profile is more informative than an industry label. Describe normal operation, large load changes and any nonlinear equipment so the proposed design can be assessed against the actual duty.
Translate the application into a specification.
Include rated capacity, voltage ratio, frequency, load profile and installation conditions. State the applicable project standard and any site-specific limits. Confirm the final specification with the engineer responsible for the project.
Compare the same duty and evidence.
Request the proposed model, guaranteed no-load and load losses, the reference conditions and reports covering that model. Ask for a quotation covering the exact rating and configuration you need.
Complete the project brief.
Request any additional specifications needed for your comparison. Confirm delivery, testing, installation and maintenance responsibilities with each manufacturer.