Class A Electrical Equipment

In electrical and safety engineering hazardous locations hazloc pronounced haz lōk are places where fire or explosion hazards may exist.

Class a electrical equipment.

This publication introduced eight modifications and additions to the classes of prescribed electrical equipment categories. These are now listed in appendix b of as nzs 4417 2 and take effect on 2 july 2018. Electrical equipment installed in such locations could provide an ignition source due to electrical arcing or high temperature. Class c fires may begin from a short circuit faulty wiring power cord damage overcharged devices or overloaded electrical outlets.

In many countries the plug of a class 0 equipment is such that it cannot be inserted to grounded outlet like schuko. 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. These appliances do not have their chassis connected to electrical earth. Each type of protection achieves its safety from ignition in different ways and not all are equally safe.

These changes are as follows. The supplementary protection is intended to come into play in the event of failure of the basic protection. Any place where electrical equipment is used or electrical wiring is present is a potential. 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.

Sources of such hazards include gases vapors dust fibers and flyings which are combustible or flammable. A class c fire is an energized electrical fire. Examples of class i appliances are refrigerators microwaves kettles irons and toasters. For mains powered electrical equipment there are usually two levels of protection used called basic and supplementary protection.

As nzs 4417 2 2018 was published on 2 july 2018. 4 1 class i equipment. 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. However the only way to confirm whether the appliance is class i is to look for the class i symbol on the appliance.

Class i equipment has a protective earth. 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. There are ten recognized types of protection for hazardous area electrical apparatus.