Unified Requirements


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 E7 Rev4 CLN

UR E7 Cables - Rev.4 Apr 2016

UR E8 Deleted

Starting arrangements of internal combustion engines - Deleted Dec 2003

UR E9 Rev1 CLN

UR E9 Earthing and bonding of cargo tanks/process plant/piping systems for the control of static electricity - Rev.1 Oct 2012

UR E10 Rev6 CLN

UR E11 Test specification for type approval - Rev.6 Oct 2014 Clean

UR E11 Rev3 CLN

UR E11 Unified requirements for systems with voltages above 1 kV up to 15 kV - Rev.3 Feb 2015

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 E13 Test requirements for rotating machines - Rev.2 Aug 2015 

UR E15 Rev3 CLN

UR E15 Electrical services required to be operable under fire conditions and fire resistant cables - Rev.3 Dec 2014 Clean

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 E18 Recording of the type, location and maintenance cycle of batteries - Rev.1 Dec 2014

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

UR E22 Rev2 CLN

UR E22 On board use and application of computer based systems - Rev.2 June 2016

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