back again, first day first assesent on explosive powered tools. i feel i went ok however the wording on some questions was a touch ambiguous. the basic theory goes like this. there are two types direct and indirect explosive power tools(ept). of which in both there is a firing pin a cartridge and a drive pin. the indirect however has piston which seperartes the drive pin from the cartridge. EPT are used to fix steel and timber to concrete bricks and steel. they should not be used to fix timbers to brittle materials such as tiles and fibre cement. most drive pins are made from hardened steel and those to be fixed into concrete have a smooth finish and should penetrate22 ,32mm deep whethers those to be fixed to steel have a knurled finish ortwisting appearance, so as to hold firmer. they should also protrude 5mm out the back of the steel. the min thickness to fire into is 4mm ror steel. there is also a threaded stud there is also a threaded stud that is similiar to a dyna bolt. or there is the option of adding on special fittings eg conduit clip. for ept that are loaded through the barrell a cap is placed on the tip of the drive pin to guide it straight down the barrell. there are different colours that code strenghts of chargers in this order brown green yellow red purple white black. or to remember; beer gets you really pissed with bourban. if however the change is only slight ,most modern epts have a power control so change of colour may not be neccessary. just turn the dial. charges can be in single rotary tube or strip but should always be stored in a locked container. safety is also important here are some requirements. will not fire without force direct epts have a guard, must not fire if tilted over 6 degrees, safety signs should be erected, eye and ear protection worn and every 12 months service the tools. there is also safety rules these include never point at someone dont load until ready to fire never use on brittle substances dont fire within 75mm to concrete edge or 15 mm to steel edge never fire in air or near flammable materials. make sure 6m clearance warn other people do not leave unattended and if fails to discharge wait 10 seconds before removing.