Class A Electrical Equipment

Energized in this case means that it is fed by a power source.

Class a electrical equipment.

These changes are as follows. This publication introduced eight modifications and additions to the classes of prescribed electrical equipment categories. In addition to the equipment being suitable for the gas group and the temperature class required the type of protection must be suitable for the zone in. In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist.

These are now listed in appendix b of as nzs 4417 2 and take effect on 2 july 2018. Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. However equipment of this class is common in some 110 v countries and in much of the 220 v developing world whether permitted officially or not. For mains powered electrical equipment there are usually two levels of protection used called basic and supplementary protection.

In many countries the plug of a class 0 equipment is such that it cannot be inserted to grounded outlet like schuko. 4 1 class i equipment. Class ii equipment may also be manufactured with metal enclosures which are double insulated from live parts class ii equipment does not need an earth conductor and should not be earthed. Class c fires may begin from a short circuit faulty wiring power cord damage overcharged devices or overloaded electrical outlets.

However the only way to confirm whether the appliance is class i is to look for the class i symbol on the appliance. Most modern power tools and equipment which is subject to movement or flexing of the cord fall in to this category. Electrical equipment and devices within five feet of workstations in which flammable liquids or gases are used shall be in accordance with the electrical code for class i division 2 hazardous locations except when the air removal from the workstation or dilution will provide nonflammable atmospheres on a continuous basis ufc 5104 5. Class i appliances are usually made of metal have three cables have a metal earth pin and have a fuse in the plug.

Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature. These appliances do not have their chassis connected to electrical earth. Class i equipment has a protective earth. A class c fire is an energized electrical fire.

As nzs 4417 2 2018 was published on 2 july 2018. The supplementary protection is intended to come into play in the event of failure of the basic protection. There are ten recognized types of protection for hazardous area electrical apparatus.