AS ISO 14990.2:2022 pdf download Earth-moving machinery — Electrical safety of machines utilizing electric drives and related components and systems Part 2: Particular requirements for externally-powered machines
4  General requirements
4.1  General
The requirements of ISO 14990-1:2016, Clause 4, shall apply except as modified by this clause.
4.2  Special conditions
The enquiry form given in Annex A can be used as the basis for an agreement between user and supplier to address special conditions, or where certain provisions of this document might not be applicable.
The waiver of any requirement shall be limited to situations not covered by this document.
4.3  Supplies
4.3.1  AC supplies
Voltage: Steady-state voltage: 0,9 to 1,1 of nominal voltage.
Frequency: 0,99 to 1,01 of nominal frequency continuously; 0,98 to 1,02 short time.
Harmonics: Harmonic distortion not exceeding 10 % of the total r.m.s. voltage between live conductors for the sum of the 2nd to the 5th harmonic. An additional 2 % of the total r.m.s. voltage between live conductors for the sum of the 6th to the 30th harmonic is permissible.
Voltage unbalance: Neither the voltage of the negative sequence component nor the voltage of the zero equence component in three-phase supplies exceeding 2 % of the positive sequence component.
Voltage interruption: Supply interrupted or at zero voltage for not more than 3 ms at any random time in the supply cycle with more than 1 s between successive interruptions.
Voltage dips: Voltage dips not exceeding 20 % of the peak voltage of the supply for more than one cycle with more than 1 s between successive dips.
4.3.2  DC supplies
4.3.2.1  From batteries
Voltage: 0,85 to 1,15 of nominal voltage; 0,7 to 1,2 of nominal voltage in the case of battery operated vehicles.
Voltage interruption: Not exceeding 5 ms.
4.3.2.2  From converting equipment
Voltage: 0,9 to 1,1 of nominal voltage.
Voltage interruption: Not exceeding 20 ms with more than 1 s between successive interruptions.
NOTE  This is a variation on IEC Guide 106 for ensuring the proper operation of electronic equipment.
Ripple (peak-to-peak): Not exceeding 0,15 of nominal voltage.
5  Protection against electric shock hazards
5.1  General
The requirements of ISO 14990-1:2016, Clause 5 shall apply except as modified by this clause.
5.1.1 See Figure 2 for an example of equipotential bonding for electrical equipment of an externally-powered EMM.
5.1.2 For EMM where the connection to the earthing system (machine bonding conductor) is provided solely by flexible cables, the continuity of the protective conductor shall be ensured by appropriate design of the cable. Where there is a possibility that the cable and hence the machine bonding conductor could become damaged (e.g. a trailing cable dragged on the ground), the continuity of the protective bonding circuit shall be monitored. The supply to the electrical equipment of the machine or to the relevant part of the machine shall be switched off whenever

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