In the world of commercial barbecue, how you hold the meat is almost as important as how you smoke it. Most barbecue joints cook in one or two large batches. The briskets that are being served at Barbecue joints across the state share this problem but solve it with a variety of methods.
In urban areas there is one to every few hundred houses, in rural areas they are smaller still, often mounted on poles, and serve just a few homes.
There are oversubstations in the UK - more on numbers of substations. This means in most cases a substation is not a significant source of exposure in homes.
But sometimes, if the substation is right next to a house, it can be a reason for the field in the home being elevated. This is most true for substations built into a block of flats or other large building where it can be just the other side of a wall from a public or residential area.
This does happen but is relatively rare in the UK. The design of substations varies. The individual items of Final paper smoking in outdoor substations tend to be relatively compact, and modern substations are often a "unit" design where the transformer, switchgear and fuseboard are all bolted together in a single unit, which is even more compact.
But indoor substations can be laid out more spaciously - the frame with all the fuses can be spread over a wall, and the busbars may be fastened to a wall or ceiling fairly well spaced.
So, sometimes, these substations can produce higher magnetic fields than most substations. See more detail on substations inside buildings. Pole-mounted transformers Some final-distribution transformers are mounted above ground on wooden poles. There is usually less switchgear than with ground-mounted transformers, and with the extra separation produced by the height of the transformer above ground, these substations will rarely be a source of field - the field near them is more likely to come from the overhead lines supplying them The evidence National Grid surveyed 25 final distribution substations in suburban areas in Surrey in the s.
Mean magnetic fields close to the perimeter fence were about 1. Grainger and Preece [see abstract below] surveyed substations in four areas round Bristol. The average value of the field at the closest public access to the substation ranged from 0.
Maslanyj [see abstract below] surveyed 27 substations in Oxfordshire.
The mean magnetic field against the boundary was 1. Distances for the field to fall to 0. Int J Environ Health Res.
The contribution of local distribution substations and associated area distribution system to personal exposure to power frequency magnetic fields. Grainger P, Preece AW. Paul O'Gorman Childhood Leukaemia Research Centre, University of Bristol A number of epidemiological studies has shown a significant correlation between wire coding, magnetic fields and childhood cancer, although a more recent study has not [McBride et al.
In the UK there is currently no equivalent to wire-codes and there is some uncertainty about the extent to which the UK medium-voltage electricity distribution systems contribute to personal exposure and how this compares with US overhead supply systems.
Studies on four different area types were carried out to measure magnetic field intensities from typical electricity supply utility substations and cabling in the vicinity of domestic housing. Typically at distances of two metres from the substations mean magnetic field intensities were 20 nano teslas nT or less, increasing to 0.
The mean magnetic field exposure level sampled around the four main test areas varied between 0. NRPB-M Power-frequency electromagnetic fields associated with local area electricity substations M P Maslanyj Local area substations are the components of the distribution system which convert electricity at 11 kV to V and thereby provide the link with the domestic electricity supply.
They are sources of magnetic and potentially electric fields. Representative substations in south Oxfordshire were surveyed in order to characterise the magnetic fields around enclosure fences. Some of the sites were revisited in order to measure the associated electric fields.
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