Occupational exposure (electric): 46 kV/m. 172. The public exposure figures apply only where the time of exposure is significant.
173. The UK Government considers that receptors to such exposure at potentially significant periods of time may be regarded as residential properties and properties where members of the public spend an appreciable proportion of their time (source: The Written Ministerial Statement of October 2009, para 42). However the period of time is not defined. Significance is further clarified in the guidelines, ‘Power Lines: Demonstrating compliance with EMF public exposure guidelines – A voluntary Code of Practice’ (DECC 2012):
174. EATL would seek to comply with Government policy on EMF exposure limits and the potential exposure levels would be below the ICNIRP recommended exposure limits. Since the onshore cable would be routed though predominantly arable land with a low residential population throughout, the sensitivity of the receptor is considered to be low. The field strength would be a maximum of 100μT and well within the 360μT public exposure limit and 1800μT occupational exposure limit, therefore the magnitude is considered to be negligible. This results in an assessment of negligible impact significance.
175. The converter station would be designed to immediately sever all power to any cable that fails in service in much the same way as domestic electrical circuits are protected by modern consumer units to avoid health risks associated with cable fracture. A cable failure underground is not considered to have a visible effect at the surface. The cable would, however, be electrically inert immediately after the failure event.
22.6.2.9.2Converter Station 176. The converter station would produce both DC and AC electromagnetic fields, but these are very short range and would be shielded by the building and perimeter fence. EATL would require the Contractor to evaluate the electromagnetic fields at the onshore converter station with respect to human exposure. This study would be followed up with a Site Acceptance Test to demonstrate that the converter station and AC connection comply with UK Government guidelines on occupational and public exposure limits.
177. Following the implementation of the embedded mitigation above, no impacts are predicted at the converter station.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 22 Land Use Page 49
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