AS NZS 4871.5:2002 pdf free download.Electrical equipment for coal mines, for use underground Part 5: Battery powered electrical mobile machines.
2.3.7 Creepage distances
The creepage distance between the poles of adjacent cells and between these poles and any non-insulated portion of the battery container shall be at least 35 mm. Where nominal voltages between adjacent cells of the battery exceed 24 V, these creepage distances shall he increased by at least 1 mm for each 2 V in excess of 24 V.
An airspace of at least 35 mm shall he provided between the underside of the battery cover and the top of the battery, including the terminals and connectors.
2.3.8 Covers
The covers of battery containers shall be fixed in such a way that any inadvertent opening or displacement whilst in service is avoided and filled with automatic retainers or stays on opening.
Each cover shall be provided with a fastener for securing the cover to prevent opening by unauthorized persons.
2.3.9 Securing of cells
The cells or blocks of cells shall be built into the battery containers in such a way that there is no significant movement in service. The materials for built-in items (for e.g. packing and insulating barriers) shall be insulating, non-porous, resistant to the action of the electrolyte and flame resistant.
2.3.10 Other electrical apparatus
Any other electrical apparatus affixed to or incorporated in the battery container shall comply with the requirements for the appropriate type of explosion protection.
2.4.2 Connections
The inter-cell connectors between cells or blocks of cells that cannot move relative to one another may be rigid.
Where cells or blocks of cells can move relative to one another they shall be flexible.
Cell terminals shall be burned on, except that bolted connectors using two or more bolts may he used for take-off leads.
2.4.3 Duty
The connectors and terminations shall be able to carry the current required for the duty without exceeding the recommended temperatures for connector and its insulation. Where the duty cannot he specified, the battery shall he assessed at the 1 h discharge rate specified by the battery manufacturer or at the maximum discharge current specified by the battery manufacturer. Where double connectors are used, normally above 600 A.h, each single connector shall be capable of carrying the total current at the I h discharge rate for 21 seconds, without exceeding the recommended temperature for the connector and its insulation.
2.4.4 Shrouding
All live parts of the battery shall he shrouded by flame resistant insulating material, impervious to the electrolyte.AS NZS 4871.5 pdf download.