Nonel tunnel is a non-electric initiation system intended for use in tunnel and underground blasting works. It consists of a series of NPED (i.e. Non-Primary Explosives Detonator) with suitable length of Nonel tube. All detonators have inividual delay. The strength of each detonator is that of a No.8 plai detonator.
Nonel tunnel detonators are best intiated by means of bunch connectors or detonating cord. A bunch connector consits of a loop of detonating cord incorporated in surface connector (usually zero delay). A bunch connector is designed for the reliable initiation of a maximum 20 Nonel-tubes.
