Honeywell ST 3000 User Manual

Page 100

Advertising
background image

B.2

International Electrotechnical Commission (IEC)
Classification of Hazardous Locations,

Continued

IEC Methods of
Protection

The following table summarizes available methods of protection for use
in given locations.

Protection Concept

Designation

Permitted Use

Principle

Flameproof

d

Zone 1 & 2

Contains explosion and
quenches flame.

Intrinsic Safety

ia

Zone 0, 1 & 2

Limits energy of sparks under
2 faults.

ib

Zone 1 & 2

Limits energy of sparks under
1 fault

Pressurized

p

Zone 1

Keeps flammable gases out.

Encapsulation

m

Zone 1 & 2

Keeps flammable gases out.

Increased Safety

e

Zone 1 & 2

No arcs, sparks or hot
surface.

Powder Filled

q

Zone 1 & 2

Contains explosion and
quenches flame.

Oil Immersion

o

Zone 1 & 2

Keeps flammable gases out.

Non-sparking

nA

Zone 2

No arcs, sparks or hot
surfaces under normal
conditions.

Enclosed Break

nC

Zone 2

Contains explosion and
quenches flame.

Limited Energy

nA

Zone 2

Limits energy of sparks and
surface temperature under
normal conditions.

Restricted Breathing

nR

Zone 2

Keeps flammable gases out.

Continued on next page

90

ST 3000 Release 300 Installation Guide

2/05

Advertising