and spaced a sufficient distance from the walls to prevent arcing this will depend on the voltage and the spacing of the electrode to the air passage walls a general guideline is to provide 0 1 inch spacing per 3500 volts thus for most dies with a voltage of 5 kv spacings of 0 15 inches would be adequate as previously noted the electrodes are electrically insulated from the die body assemblies 42 and 43 may be used to secure opposite ends of the electrode wires to the die body as illustrated in fig3 assembly 42 is mounted in hole 19a of panel 19 and assembly 43 in hole 18a of panel 18 with electrode wire 44 stretched therebetween spanning substantially the length of air passage 36 and generally perpendicular to the air flow therethrough assembly 43 comprises bushing 46 mounted in panel hole 18a jack member 47 abutting bushing 46 and jack cap 48 threaded to member 47 bushing 46 is made of an insulating or dielectric material such as ceramic and has a hole 49 sized to sealingly receive wire 44 one end of the electrode wire 44 is attached to the exposed end of jack cap 48 by brazing or a connector as at 51 connection 51 supports.