What limits apply in the UK?
There are no statutory exposure limits in the UK. The limits that apply do so as a matter of Government policy. Some industries including the electricity industry have a policy of complying. Some do not, and it is doubtful if the limits could be legally enforced.
For public exposure, the UK policy is to comply with the 1998 ICNIRP guidelines in the terms of the 1999 EU Recommendation.
For occupational exposure, the UK policy is to comply with the 1998 ICNIRP guidelines.
In 2010, ICNIRP produced new guidelines. But these do not automatically take effect in the UK. The UK policy remains based on 1998 ICNIRP until Government decide otherwise. more on this
Where is this policy written down?
The policy stems from advice given by NRPB in 2004.
The National Radiological Protection Board (NRPB) was the independent body charged by the UK Parliament with giving advice on EMFs, including advice on safe levels of exposure. On 1 April 2005, the NRPB joined the Health Protection Agency, becoming the Radiation Protection Division. Until 2004, the NRPB published its own exposure guidelines, last revised in 1993. In March 2004, it published new Advice on limiting exposures to EMFs. This Advice recommended that the UK adopts levels published internationally by ICNIRP, the International Commission on Non-Ionizing Radiation Protection (more detail on the 2004 NRPB Advice). This advice has been accepted by Government for both public and occupational exposure.
For public exposure
There are three tiers of documents that establish the public exposure limits in the UK:
The key statement in the Written Ministerial Statement is:
"In the absence of any practical precautionary low-cost measures for reducing the exposure to ELF EMF associated with high voltage overhead lines, the Government believes that the 1998 ICNIRP Guidelines on exposure to EMFs in the terms of the 1999 EU Recommendation, as recommended by the Health Protection Agency and in line with the view of the World Health Organization, remain relevant. ... We are therefore of the view that protection of the members of the public from the possible risks of long term exposure should be based on compliance with the ICNIRP guidelines." (paras 40 and 41)
The Written Ministerial Statement confirmed an existing policy. In August 2004, in response to the NRPB’s recommendation, the Parliamentary Under Secretary for Public Health (Melanie Johnson) wrote to the Chairman of the NRPB welcoming the new advice. The letter included a 10 point annex describing the way Government intends to implement the NRPB advice. It points to the need for inter-departmental working and introduces the initial plans for a wider stakeholder process in order to consider the possible need for further precautionary measures in respect of extremely low frequency (ELF) electromagnetic fields (EMF).
The key statement about implementation was:
“… the Government expects the NRPB guidelines to be implemented in line with the terms of the EU Recommendation, that is, taking account of the risks and benefits of action. Preliminary discussions have already taken place to identify what reasonable actions might be taken.”
The limits apply where the time of exposure is significant - see more on what "significant" means
For occupational exposure
Occupational exposure limits are the province of the HSE. They state:
"There is at present no UK legislation specific to EMFs. Control is exercised through the general duties in the Health and Safety at Work etc Act 1974, the Management of Health and Safety at Work Regulations 1999 and by reference to ICNIRP guidelines."
"[The ICNIRP and former NRPB guidelines] are currently used both by industry and HSE Inspectors when assessing risk from exposure to electromagnetic fields."
So, for occupational exposures, the ICNIRP limits do not have legal force in themselves but they are the standard used to judge compliance with the general duty for health and safety.
What are the numbers?
See under ICNIRP and the EU Recommendation for the details. But the "headline" figures are:
The public exposure figures apply only where the time of exposure is significant.
Limits for static fields
This site is about the 50 and 60 Hz fields produced by the power system. But the 1998 ICNIRP guidelines and the 1999 EU Recommendation that we describe here also apply to static fields.