OFFSHORESTANDARDS
EditionJanuary2017Amended January2018
Electricalinstallations
The electronic pdf versionof this document availablefree of charge from is the officially binding version.
FOREWORD
DNV GL offshore standards contain technical requirements principles and acceptance criteriarelated to classification of offshore units.
CHANGES-CURRENT
Changes in this document are highlighted in red colour. However if the changes involve a whole chapter This document supersedes the January 2017 edition of DNVGL-OS-D201.section or sub-section normally only the title will be in red colour.
Amendments January 2018
Ch.2 Sec.10 Installation
Ch.2 Sec.10 [3.5.3]: New interpretation added to clarify cable routing and protection requirements.
Main changes January 2017 entering into force 1 July 2017
Ch.2 Sec.2 System design
Ch.2 Sec.2 [1.2.4] : Aligned DC voltage tolerances in accordance with DNV GL rules for classification: Ships and IACS Unified Requirements. Ch.2 Sec.2 [1.2.7]: Added requirements to operating modes for systems with harmonic filter units in accordance with IACS UR E24. asnou no uonis noxe e u es o ede au pue soeaan ui o sawanbathe emergency source of power.Ch.2 Sec.2 [3.1.1]: Aligned the wording in g) in line with the MODU code text. The wording *for blackout situations" has been removed and replaced with "to supply non-emergency circuits". Guidance noteCh.2 Sec.2 Table 1: Added requirement to emergency lighting for escape routes leading to muster and related to ventilation closing arrangements is added.landing decks is aligned with MODU code.Ch.2 Sec.2 [3.1.6]: Clarified the guidance note with a better reference to applicable codes.Ch.2 Sec.2 [3.3.4]: Clarified requirement to overcurrent protection of emergency generator when it isCh.2 Sec.2 [4.1.2]: Editorial changes. used as a harbour generator.Ch.2 Sec.2 [5.1.1]: Clarified location of starting batteries.aeaq a snq o suaajnba yo uogeyue :[st'9] pio pue [9] zas zu Ch.2 Sec.2 [6.2.4] : Added requirements to lighting controllers as such now is introduced both for normalCh.2 Sec.2 [6.2.7]: Requirements to duplication of navigation lights are flag state issues and not covered and emergency lighting.by the basic class scope. The requirement to duplication of circuits is therefore deleted. Ch.2 Sec.2 [6.4.1]: Added requirement to PE connection between shore and unit.Ch.2 Sec.2 [7.1.2]: Strengthened the requirement to audible and visual alarm when there is an insulationCh.2 Sec.2 [7.1.5]: Added requirement to overvoltage protection. fault. Such an alarm is seen as normal today.Ch.2 Sec.2 [7.1.6]: Clarified requirements to discrimination. Ch.2 Sec.2 [7.3]: Editorial changes and clarifications.Ch.2 Sec.2 [7.3.1]: Updated with part from former paragraph Ch.2 Sec.2 [2.1.1].transformers and high voltage propulsion transformers.Ch.2 Sec.2 [7.7.1]: Added requirements to protection and monitoring of harmonic filter units inaccordance with IACS UR E24.
Ch.2 Sec.2 [8.1]: Re-arranged requirements to control power.Ch.2 Sec.2 [8.1.4] : Requirements to control of duplicated consumers has been moved from Ch.2 Sec.2 Sec.4.Ch.2 Sec.2 [8.2] and Ch.2 Sec.2 [8.3]: split the previous paragraph in two and re-arranged requirements to control power.Ch.2 Sec.2 [8.2.5]: Added clarification of instrumentation requirements to DC sources of power (generator units with a rectifier between the machine and the main busbar).ao ylu woy snp japa buwou oy uogeuangsu q suaaujnbau papp :[tg] z'sas zutransformers. Ch.2 Sec.2 [8.5.1] : Added requirement that all motors starters shall have indication when switched on. Ch.2 Sec.2 [8.5.4]: Paragraph moved to Ch.2 Sec.12. Ch.2 Sec.2 [8.5.2]: Added local/remote selector switch for fire pump motor starters.Ch.2 Sec.2 [8.6.1]: Rephrased and clarified.Ch.2 Sec.2 [9.4]: Requirements to installation and ventilation of batteries re-written. Aligned with Ch.2 Sec.2 [9.2.2]: Added requirements related to gas insulated high voltage switchboards. Ch.2 Sec.2 [9.5.2]: Added requirements for installation of emergency distribution in fire zones. relevant IEC standards.Ch.2 Sec.2 [9.7.1]: Deleted requirement to distance between earthing points for aluminium structures.Ch.2 Sec.2 [10.1.2]: Editorial change. Ch.2 Sec.2 [10.1.3]: Extended the guidance note for clarity.Ch.2 Sec.2 [10.1.6]: Editorial change. aq aeu [e'ot] z'sas z'u woy suogas os paaap uaaq seu ydeeeed su :[zo] z'sas z'urenumbered.Ch.2 Sec.2 [10.3] : PVC not longer accepted as conductor insulation. Paragraphs aditionally edited. Ch.2 Sec.2 [10.4.1]: Clarified.- Ch.2 Sec.2 Table 6 and Ch.2 Sec.2 Table 8: Added rating tables for aluminium cables. Ch.2 Sec.2 [10.7.1]: Deleted rating table for 70 degr. C.
Ch.2 Sec.3 Equipment in general
Ch.2 Sec.3 [4.4.1]: Clarified. Ch.2 Sec.3 [4.5.1]: Clarified.quawdinba Aneay yjo uogeuqia oq squawaujnbau bugsa ad paonpay :[t't'] e'sas z'u
● Ch.2 Sec.4 Switchgear and controlgear assemblies
Ch.2 Sec.4 [1.1.5] : New item b) related to feeder panels in LV switchboards supplied from HV. Ch.2 Sec.4 Table 2: Updated.Ch.2 Sec.4 [2.1.5]: Requirements for LV circuit breakers for IT systems added.Ch.2 Sec.4 Table 7: Table for rating of internal wiring is added. Ch.2 Sec.4 [2.2.1] : Updated in accordance with relevant IEC standard.Ch.2 Sec.4 [2.2.3]: Parts of the paragraph have been moved to Ch.2 Sec.4 [3.1.2] Ch.2 Sec.4 [2.2.3]: Editorial.Ch.2 Sec.4 [2.2.4]: New acceptance of high voltage switchgear without separation between circuit breakerCh.2 Sec.4 [2.2.5]: Clarification in line with industry practise. partment and cable termination partment.Ch.2 Sec.4 [2.2.9] : Added requirement to gas insulated systems. Ch.2 Sec.4 [2.2.8]: Clarification of today's acceptance criteria.Ch.2 Sec.4 [old 3.1.2]: Moved to Ch.2 Sec.2. Ch.2 Sec.4 [3.1.7]: Added requirements to instrumentation of feeder circuits. Ch.2 Sec.4 [3.1.4] : Requirements to protection and synchronising devices added.Ch.2 Sec.4 [4.1.4] and Ch.2 Sec.4 [4.1.6]: Clarification.
Ch.2 Sec.5 Rotating machines
Duapisuo) oto -toog t ym aul u paepn sw asu anqeada aoy ae t aqei s'as zumarine ambient temperature).Ch.2 Sec.5 [1.3.1]: Increased requirement to temperature detectors in stator windings. Ch.2 Sec.5 [1.2.8]: Added requirement to shaft locking device.Ch.2 Sec.5 [2.3.2]: Added requirement to documentation of decrement curve. In line with IACS Unified Requirements.Ch.2 Sec.5 [3]: Added technical requirements to permanent magnet machines. Ch.2 Sec.5 Table 2 and Ch.2 Sec.5 Table 3: A new table with additional and modified requirements fortesting and inspection of propulsion motors and shaft generator.Ch.2 Sec.5 [4.1.1]: All guidance notes have been transformed into paragraphs. Ch.2 Sec.5 [4.1.2]: New paragraph about interturn testing. Ch.2 Sec.5 [4.1.3] and Ch.2 Sec.5 [4.1.4] : Requirements for verification of permanent magnet machineswith respect to acceptable types.
Ch.2 Sec.6 Power transformers
*sa as yeau o aqns aq o paau you saosue bueas eu pague :[z't'] g'sa zu
Ch.2 Sec.8 Miscellaneous equipment
- Ch.2 Sec.8 [1.5]: Added requirements to slip ring units.
*Ch.2 Sec.9 Cables
Ch.2 Sec.9 [2.3.1] and Ch.2 Sec.9 [2.3.2] : Added acceptance to use aluminium conductors in cables.Minimum cross section 50 mm².- Ch.2 Sec.9 [2.4]: PVC is not longer accepted as an insulation material.
Ch.2 Sec.10 Installation
awdinba Aayes essaau yo auasaud au o quawanbau papp :[e't'] ot'as 7u Ch.2 Sec.10 Table 1: Updated table for IP rating (some requirements reduced).Ch.2 Sec.10 [3.1.1]: Added that cables in acmodation spaces shall be of low smoke halogen free type. Also added requirement to mud resistant cables.Ch.2 Sec.10 [3.9.2]: Added requirements to termination kits for aluminium conductors.Ch.2 Sec.10 [3.9.3]: Added requirements to termination of high voltage cables. Ch.2 Sec.10 [4.2.2]: Added requirement to test and inspection of cable installation and cableCh.2 Sec.10 [4.4]: Some clarifications in accordance with normal practise. penetrations.Ch.2 Sec.10 [4.4.7]: Added reguirement from IACS UR E24 that harmonic distortion shall be measuredCh.2 Sec.10 [4.4.8]: Rephrased explanatory sentence about why emergency generator shall be on board ships with harmonic filters.disconnected during testing of automatic standby start.
Ch.2 Sec.11 Hazardous areas installation
Ch.2 Sec.11 [4.2.2]: Added a possibility for isolation of braid inside plastic enclosures in the field. Ch.2 Sec.11 [3.2.5]: Clarification. Ch.2 Sec.11 [4.2.5]: Updated in line with IEC 60079-0 clause 16 all glands and blanking elements shallbe covered by an Ex certificate.
