ATEX ve AMERİKAN STANDARTLARINA GÖRE EX İŞARETLEME

 
 

 
Europe/IEC/CENELEC/NEC505 Continuous Hazard >1000hrs/yr
 
Intermittent Hazard 10-1000hrs/yr
 
Hazard under abnormal conditions 0.1-10hrs/yr
North America/NEC500-503
 
Zone 0(Zone 20 dust)
 
Zone 1(Zone 21 dust)
 
Zone 2(Zone 22 dust)
Safety Categories - Vapours
 
Division 1(gases&dusts)
 
Division 1(gases&dusts)
 
Division 2(gases&dusts)
Safety Categories - Dusts
 
G1 G2 G3
  D1 D2 D3
 

Hazard Category ::

 
 
If your company is planning an expansion, retro-fit, grass roots facilities, or simply modifying a process unit, and the process hazard analysis (PHA) indicates you need a safety instrumented system (SIS) as a protective layer, then you need to comply with ANSI/ISA S84.01. Why? Because in February 1996, the "Application of Safety Instrumented Systems for the Process Industries" was approved and will be enforceable under OSHA 29 CFR Part 1910. There are at least five (5) references in this Federal Register that state "...accepted engineering standards and practices". For example :
 

Hazardous Substances

APPARATUS CLASSIFICATION  
Europe North America NEC 500-503 Ignition Energy
Methane Group I(mines) Class I, Group D >260 microJoules
Gases and Vapours
Acetylene
Hydrogen
Ethyl
Propane
 
Group IIC
Group IIC or IIB
Group IIB
Group IIA
 
Class I, Group A
Class I, Group B
Class I, Group C
Class I, Group D
 
>20 microJoules
>20 microJoules
>60 microJoules
>180 microJoules
Dusts
Metal Dust
Coal Dust
Grain Dust
In Preparation
In Preparation
In Preparation
 
Class II, Group E
Class II, Group F
Class II, Group G
 
More ^
 Easily ^
 Ignited ^
Fibres and Flyings
Wood, paper or cotton fibre processing
Not Classified Class III -
 
Temperature Classification ::
 
 

MAXIMUM TEMPERATURE

Deg. C

 IEC60079-0

T CLASS

NORTH AMERICA

NEC 500-3(d)

450

T1

T1

300

T2

T2

280

T2

T2 A

260

T2

T2 B

230

T2

T2 C

215

T2

T2 D

200

T3

T3

180

T3

T3 A

165

T3

T3 B

160

T3

T3 C

135

T4

T4

120

T4

T4 A

100

T5

T5

85

T6

T6

 
Methods of Explosion Protection ::
 
 
European Practice Zone ATEX Cat. CENELEC EN IEC 60079 American Practice Division General Characteristics
Category 1G     50284 -26     Permits combined methods of protection
General Requirements     50014 0     Basic electrical requirements
Oil-immersion Ex"o" 1, 2 2, 3 50015 -6 Oil-immersion 1, 2 Suitable for transformers and where there are moving parts.
Pressurisation Ex"p" 1, 2 2, 3 50016 -2 Purging 1, 2 Suitable for cabinets, motors, analysers or working area. Requires specific alarm systems.
Powder-filling Ex"q" 1, 2 2, 3 50017 -5 Not Recognised   Suitable for weighing machines and where there are non-moving parts.
Flameproof Ex"d" 1, 2 2, 3 50018 -1 Explosion- proof (1), 2 Suitable for dc motors. Relatively easy to be applied but with specific mechanical requirements.
Increased Safety Ex"e" 1, 2 2, 3 50019 -7 Not Recognised   Suitable for non sparking apparatus during normal operation. (Terminals, connectors, lamp sockets, induction motors etc.)
Intrinsic Safety Ex"ia" 0, 1, 2 1, 2, 3 50020 -11 Intrinsic Safety 1, 2 Suitable for process instruments. Low energy, safe with 2 faults.
Intrinsic Safety Ex"ib" 1, 2 2, 3 50020 -11 Not Recognised   Suitable for displays. Low energy, safe with 1 fault.
Intrinsically safe systems     50039 -25     Considers combination of intrinsically safe apparatus
Type "n" 2 3 50021 -15 Non-Incendive 2 Alternative to standard types of protection.
Encapsulation Ex"m" 1, 2 2, 3 50028 -18 Not Recognised   Suitable for solenoid valves and small circuits and windings.
Special Ex"s" (0), 1, 2       See NEC Section 90-4 For apparatus for which safety can be demonstrated, but not according to any standard method.

 Ana Sayfa