Detonating Cables

Detonating Cable. See Vol 2 of Encycl, p B17-L under Bangalore Torpedoes... 

Activator, Antitank Mine, M2) 98-100 (Incendiary Bursters) 115 (Fuze in Projected Charge M3A1 used for projecting a detonating cable across the field for mine clearing)... 

Compare with BANGALORE TORPEDOES Detonating Cables Demolition Hoses and Demolition Snakes, described in Vol 2 of... 

V. Jot os consist of propelling-type motors used to furnish auxiliary thrust in the launching of aircraft, rockets, guided missiles, target drones and mine clearing detonating cables... 

Bangalore torpedoes 2 B16)B18 5 D1113 demolition snakes 2 B17—B18 5 D1113 detonating cable 2 B17... 

Unless we have a system where the detonator is attached directly to the fire set, we must use a cable to transmit current to the detonator. Cables, of course, also have impedance. The impedance of cables is a function of both their construction and their length. Typical cables and their impedance characteristics are shown in Table 25.2. These are the most common cables used for EBW firing systems. 

When all the holes have been charged, the leading wires from each detonator are separated and connected together with the detonators in series. The two free ends of the circuit are then connected to the shotfiring cable, the continuity tested and the round fired when all the personnel are in safe places. 

Rubber-covered electric cable, used as a makeshift handle in the effluent pit of an acetylene plant, formed copper acetylide with residual acetylene and the former detonated when disturbed and initiated explosion of the latter. All heavy metals must be rigorously excluded from locations where acetylene may be present. 

It consists of a casing fitted with a gasket, two suspension lugs, a hinge tube, an electric cable, two fuzes AN-M152A1 (described in Ref 51a, p 3-77), a burster (detonating cord), fin assembly M13 and arming wire assembly M23... 

Type 92 Moored Controlled Mine was ellipsoidal in shape, 55 by 41.5 inches, filled with 1100 lbs of Type 88 Explosive. The combined control and mooring cable entered the mine thru the base plate. An electric detonator and booster assembly were bolted to the chge underneath the top cover plate. A microphone to detect the presence of ships was also provided (p 36,... 

Type 94 Model 2 was a ground controlled hemispherical mine with a base diam 28 inches and height 25 inches, contg 190 lbs of Type 88 Explosive. The firing cable entered the Booster and Detonator well thru the side of the case (pp 38-39, Fig 5)... 

Consider the current-time trace shown in Figure 25.7 this trace is the current measured at the detonator end of the cable. When the fireset capacitor is switched on, the current at that instant is limited to the charge voltage divided by the... 

From Table 25.2, we saw that different cable types have different impedance characteristics and different transmission rates. Therefore, for the same fireset at the same charge voltage (and the same detonator), we should see different step amplitudes and step widths (and hence different burst points) for the same... 

Now we have seen that the burst action is constant for a particular wire material and diameter that the shape of the current-time trace is not a factor in achieving burst that the current-time trace is determined by the fire set and cable parameters that as long as we get burst, and as long as that burst current is sufficiently above threshold, we will detonate the initial pressing. To emphasize this. Figure 25.11 shows current traces and burst points that fired detonators from a wide variety of fireset/cable values. 

Series or parallel firing of several detonators at the end of a single trunk cable is normally discouraged. Recommended practice is to use a separate cable from the fire set to each individual detonator. The reason for this is that the trunk cable, especially a long one, is the current limiter in an EBW firing system. If,... 

Again, the current, as with the series arrangement, will be limited by the trunk cable. In this case, however, the current to each detonator in parallel will be the normal current divided by the number of detonators. The voltage will be the same as for normal firing. Thus a cable type and length that would have provided, say, a 700-A burst current for a single detonator, will provide only a 350-A burst for each of two detonators in parallel. This system also should be tested for the same parameters mentioned earlier before being fielded. 

Medard (Refs 25 29) detd some props of aluminized expls and gave a cable comparing Trauzl test values(CUP in Fr)and in some cases deton velocities of nitrocompds contg from 0 to 40% Al. It seems chat in most cases 15 to 20 is the optimum but this amt can be as high as 25% or even 30% when PEJN or RDX is present. Among the aluminized expls investigated by Medard were a)A"n 30 AN 80.2, TNT 10.6 Al 9.2% ... 

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