# The Ammonium Nitrate Materials (High Nitrogen Content) Safety Regulations 2003, Paragraph 7


Preparation for detonation.
(a) Set up the apparatus (according to 3 to 6 above) in a bunker or suitably prepared underground site (e.g. mine or tunnel) Should such firing sites not be available, the work can, if necessary, be done in a concrete-lined pit covered over with wooden beams. Ensure that the temperature of the steel tube is kept at 20 (± 5) °C before detonation.
(b) If the booster charge with seven-point initiation is used, ensure that the detonation cords are stretched out (as described in 3(1)(iv) above) and arranged as horizontally as possible.
(c) Finally, remove the wooden rod and replace with the detonator. Do not carry out firing until the danger zone has been evacuated and the test personnel have taken cover.
(d) Detonate the explosive.
(e) Allow sufficient time for the fumes (gaseous and sometimes toxic decomposition products such as nitrous gases) to disperse, then collect the lead cylinders and measure their heights with a Vernier caliper.

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Source: https://www.legislation.gov.uk/uksi/2003/1082/schedule/2/paragraph/7 (the official version)
Page: https://openlegislation.uk/ammonium-nitrate-materials-high-nitrogen-content-safety-regulations-2003/schedule-2/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.