SoSo CAD
White paperCitation2023

WP#89 - 480/277V AC-DC Power Supplies: A Study of Emerging Trends

The Green Grid · TGG Power Distribution Systems Standing Work Group

The Green Grid study of the market for 480/277 V AC-DC power supplies that let IT power supplies run directly from 277 V phase-to-neutral.

Go to the original source
On this page

Overview

This document is The Green Grid (TGG) white paper number 89, published on 6 July 2023 by the organisation's Power Distribution Systems Standing Work Group. It defines the topography of the market for 480/277 V AC-DC power supplies used in data centres. These supplies allow IT power supplies to run directly from 277 V phase-to-neutral, so the paper is relevant to designs that eliminate the PDU transformer.

The paper addresses three topics: market size, efficiency benefits and the outstanding challenges to adoption. The record gives no numerical results on these, so this page does not quote percentages or market figures. Access requires registration, and only the information on the TGG library description page was used here.

TGG notes that the findings may apply to other facilities with similar power requirements. Related references include NEC (NFPA 70) and OCP Open Rack. The paper's limit is that it is a market and trends study and does not give detailed design rules; a designer choosing higher-voltage rack feeds must separately verify equipment compatibility and the applicable codes.

Key points

  1. Dated 6 July 2023; by TGG's Power Distribution Systems Standing Work Group.
  2. Defines the topography of the 480/277 V AC-DC PSU market for data centres.
  3. Covers power supplies that let IT supplies run directly from 277 V phase-to-neutral.
  4. Covers market size, efficiency benefits and challenges to adoption.
  5. Findings may apply to other facilities with similar power requirements.
  6. Relevant to designs that eliminate the PDU transformer.
  7. Related references: NEC (NFPA 70), OCP Open Rack; registration required.

Using it in design

  • Add a 480Y/277 V-to-rack option with 277 V PSUs and no PDU transformer to the electrical topology library.
  • Remove one conversion stage in the loss model.
  • Warn that 277 V-capable IT equipment and rack PDUs are required.

Monthly newsletter · free

Keep your reading list current

Once a month: new library sources, changes to Turkish regulations and upcoming data centre events.

SoSo CAD

Review your power design in SoSo CAD

Inspect supply paths, equipment loads and UPS failure scenarios in one model.

Request a demo
Single-line diagram in the SoSo CAD power and capacity workspace

Who should read it

Designers and power-system engineers choosing the electrical distribution topology of a data centre.

Related standards

  • NEC (NFPA 70)
  • OCP Open Rack

Publication details

Authors
TGG Power Distribution Systems Standing Work Group
Publisher
The Green Grid
Year
2023
Document number
WP 89
Document language
English
Source type
Industry body
Access
Citation only
Licence
Copyright retained; citation only — the publisher’s terms apply to the original document
Original licence note

Download requires a free TGG account sign-in and is governed by The Green Grid Terms of Use; summary and facts from the public library landing page; full text not redistributed.

Citation

TGG Power Distribution Systems Standing Work Group (2023). WP#89 - 480/277V AC-DC Power Supplies: A Study of Emerging Trends. The Green Grid. WP 89. https://www.thegreengrid.org/en/resources/library-and-tools/565-WP%2389-480/277V-AC-DC-POWER-SUPPLIES-A-STUDY-OF-EMERGING-TRENDS

ElectricalEnergyRacks

Events on this subject

Browse the events calendar

All content and rights belong to the respective authors and publishers. SoSo CAD provides only the citation, its own summary and a link to the source, and is not responsible for the sources' content.