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7802.4.4.4 7802.4.9.5 The trajectory of aerial shells shall be an•anged such that a mini- mum clearance of 25 feet (7620 mm) is maintained from potential obstructions. Seamed metal mortars shall be placed such that the seam of a mortar faces to the side rather than to the top or bottom. 7802.4.4.5 Securing. Mortars shall be buried to a depth of not less than two thirds of their length, either in the Around or in above- ground troughs or drums. In soft ground, wood not less than ? in- ches (50.8 mm) nominal thickness or rock slabs shall be placed beneath mortars which will be used more than once to prevent their sinking or being driven into the ground during firing. EXCEPTION: Approved securely positioned mortar racks are al- lowed for the firing of single-break shells 6 inches (152.4 mm) or less in diameter. 7802.4.4.6 Mortar separation. Mortars that are buried in the ground, in troughs or in drums shall be separated from adjacent mortars by a distance equal to or greater than the diameter of the mortar. EXCEPTION: Electrically fired mortars. • i• 7802.4.4.7 Moisture protection. In damp ground, a weatlfer-re- sistant bag shall be placed under the bottoms of mortars prior to placement in the ground to protect mortazs from moisture. Weath- er-resistant bags shall be placed over the open end of mortars in damp weather to keep moisture from accumulating on the inside surface of mortars. 7802.4.4.8 Ground burst protection. Sand bags, dirt boxes or other suitable protection shall be placed azound mortazs on the up- range side to protect the operator from ground bursts. 7802.4.4.9 Paper mortars. 7802.4.4.9.1 Convolute. Paper mortars constructed of convo- lute wound paper shall be approved for the size aerial shells being discharged having a maximum double break. 7802.4.4.9.2 Spiral wound. Spiral-wound paper mortars shall not be used for greater than 3-inch (76.2 mm) diameter aerial shells with a maximum double break. 7802.4.4.10 Grouping mortars. Mortars of the same diameter, which are to be reloaded during a display, shall be grouped togeth- er such that various sizes are not intermixed. Groups shall be sepa- rated. 7802.4.4.11 Loose gravel and rocks. Loose gravel, rocks and other loose solid objects shall be removed from the area around mortars to prevent such materials from being thrown from sround bursts during firing. V 7802.4.4.12 Cleaning tool. When mortars are to be fired more than once during a display, a cleaning tool shall be available for the cleaning of debris from mortars as necessary. For metal mortars, the tool shall be nonsparking. 7802.4.5 Ground pieces. 7802.4.5.1 Location. Ground pieces shall be located not less than 150 feet (45 720 mm) from spectators and vehicles: not less than 100 feet (30 480 mm) from tents, canopies or membrane structures; not less than 100 feet (30 480 mm) from mortars; and outside of the designated landing area. EXCEPTIONS: 1. Fixed ground pieces are allowed not less than 7~ feet ('_'2 2160 mml from spectators and vehicles. 3. Electrically fired ground pieces are allowed in the desi~?nated landine area. 7802.4.5? Combustibles. The area beneath ;,round pieces shall be tree of dr_y grass and combustibles. -~ so 1997 UNIFORM FIRE CODE 7802.4.5.3 Securing. Poles for ground pieces shall be securely placed and braced. 7802.4.6 Electrical fire units. 7802.4.6.1 General. Electrical firing units shall be in accord- ance with Section 7802.4.6. 7802.4.6.2 Wiring. Electrical wiring associated with an electri- cal firing unit shall be prevented from contacting metal objects in contact with the ground. 7802.4.6.3 Power supply. AC-powered electrical firms units shall be isolated from the power source using an isolation trans- former. 7802.4.6.4 Security. Electrical firing units shall require opera- tion of akey-operated switch or other similar device to prevent un- authorized operation. EXCEPTION: Hand-held electrical firing units connected to fire- works only during a display. 7802.4.6.5 Manually activated firing units. Manually acti- vated electrical firing units shall require two or more distinct ac- tions to apply electric current to an electric match. 7802.4.6.6 Automatic-firing units. Automatic-sequencing- type electrical firing units shall include a momentary contact switch which must be held to cause application of current to an electric match and which will immediately disconnect current to all electric matches upon release. 7802.4.6.7 Testing of firing circuits. The pyrotechnic operator shall ensure that personnel are kept at a safe distance from fire- works which are connected to electrical firing units during testing. Electrical firing units with integral test circuits shall be designed to limit the maximum current output during a test to 0.05 ampere or to 20 percent of the no-fire current of electric matches, which- ever is less. Multitesters shall not be used for testing unless the maximum current output has been measured and determined not to exceed the current output limits for integral test circuits. 7802.4.7 Inspection. Fireworks shall be inspected upon deliv- ery to the display site by the pyrotechnic operator. Aerial shells having tears, leaks or broken fuses or showing signs of having been wet shall be properly disposed of. 7802.4.8 Supervision. Fireworks shall not be left unattended or allowed to become wet at the display site. 7802.4.9 Display operation. 7802.4.9.1 General. Display operation shall be in accordance with Section 7802.4.9. 7802.4 Q.2 Fire protection. When required by the chief, the py- rotechnic operator shall provide portable fire extinguishers for the discharge area and arrange for standby fire apparatus for protec- tion down range. 7802.4.9.3 Monitors. The pyrotechnic operator shall employ monitors whose sole duty shall be the enforcement of crowd con- trol around the display area. Unauthorized persons shall not be al- lowed to enter the discharge site until the site has been inspected after the display by the pyrotechnic operator. 7802.4.9.4 Barriers. The chief is authorized to require rope bar- riers, fences, signs or other devices to be installed au•ound the dis- play area to aid in crowd control 7802.4.9.5 Display discontinued. If the chief or the pyrrotechntc operator detemlines that there is a lack of crowd control or that the crowd is in danger, the display shall be immediately discontinued [f at any time hi~~h ~•vinds or wet weather creates a iian~er. the dis- 3