Unified Requirements are adopted resolutions on matters directly connected to or covered by specific Rule requirements and practices of classification societies and the general philosophy on which the rules and practices of classification societies are established.
Subject to ratification by the governing body of each Member Society, Unified Requirements shall be incorporated in the Rules and practices of the Member Societies, within one year of approval by the IACS General Policy Group.
The existence of a UR does not oblige a Member Society to issue respective Rules if it chooses not to have Rules for the type of ship or marine structure concerned.
Unified Requirements are minimum requirements. Each Member remains free to set more stringent requirements.
The technical backgrounds (development histories) of Unified Requirements since 1999 can be found by following this link.
A list of the IACS working groups responsible for each Unified Requirement may be found here.
UR E2 Deleted
Deleted December 1996
UR E3 Deleted
Deleted December 1996
UR E4 Deleted
Earthing of non-current-carrying parts - Deleted June 2000
UR E5 Rev1 CLN
UR E5 Voltage and frequency variations - Rev.1 Sept 2005
UR E6 Deleted
UR E8 Deleted
Starting arrangements of internal combustion engines - Deleted Dec 2003
UR E9 Rev1 CLN
UR E10 Rev6 CLN
UR E11 Rev3 CLN
UR E12 Rev1 CLN
UR E12 Electrical equipment allowed in paint stores and in the enclosed spaces leading to the paint stores - Rev.1 May 2001
UR E13 Rev2 CLN
UR E15 Rev3 CLN
UR E16 New
UR E16 Cable trays/protective casings made of plastic materials - June 2002
UR E17 New
Generators and generator systems, having the ship’s propulsion machinery as their prime mover, not forming part of the ship’s main source of electrical power - June 2002
UR E18 Rev1 CLN
UR E19 Rev1 CLN
UR E19 Ambient temperatures for electrical equipment installed in environmentally controlled spaces - Rev.1 Sept 2005
UR E20 Rev1 CLN
UR E20 Installation of electrical and electronic equipment in engine rooms protected by fixed water-based local application fire-fighting systems (FWBLAFFS) - Rev.1 June 2009
UR E21 New
UR E21 Requirements for uninterruptible power system (UPS) units as alternative and/or transitional power - Sept 2005