NSI5 Earthing Improvements
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Health and Safety
As part of the review of ‘National Safety Instruction 5’, which covers working on cables, it became clear that the current equipment specified for earthing cable
sheaths to enable maintenance is impractical and could be significantly improved. These original earths were specified when the link boxes were
originally designed but these earths are bulky and difficult to apply. These earth bonds require equipment to be carried to remote locations to facilitate application which can be very heavy. Also as different kits are required for different situations this means multiple items are require to be kept and maintained.
The Key objective of this project is to deliver an improved safe system of work for the removal of cross bonding and earthing links within cable link boxes and the application of maintenance earth bonds.