NEMA has published NEMA ICSP 10.1-2015 Clarification of Requirements for Service-rated Transfer Switches. White paper was developed to clarify National Electrical Code® for transfer switches. Developed by the Industrial Control Products and systems Section, Technical Subcommittee 16 (Transfer Switch Equipment), NEMA ICSP 10.1 is intended to be used by specifiers, purchasers, and installers and may be downloaded on NEMA website.