The display site needs to be large enough to ensure all the above areas can cope with:
- the types of fireworks to be used (this affects the size of the safety area and the fall-out area);
- a change in the direction or strength of the wind;
- the expected number of spectators.
Only make the final selection of a site after you (and preferably the display operator) have inspected it in daylight to check for obstructions, e.g. trees, adjoining buildings and overhead power lines. Apart from obstructing the flight of aerial fireworks, overhead power lines pose other potential dangers, for example:
- scaffolding poles, metal ladders and similar items used in the construction of temporary staging, or long wires such as those sometimes used in firing circuits for electrically fired fireworks, can cause a dangerous discharge of electricity from overhead power lines if they touch, or even come near to them.
This is known as a ‘flashover’;
- smoke or debris coming from fireworks or a bonfire burning under or near overhead power lines could also cause a flashover;
- overhead electric power lines near to firing wires for electrically fired fireworks can induce an electric current in the wires, causing the premature firing of the fireworks.
If you are in any doubt about overhead electric power lines, contact the local regional electricity company for advice. If it is impossible to arrange the site so the firing and bonfire areas are well away from obstructions, you may need to look for another site. In some cases the display operator may advise that certain types of fireworks you have requested cannot be fired safely at your chosen display site.
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