Yokogawa ADMAG AXR - Manual (Page 190)

IM 01E30D01-01EN
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IM 01E30D01-01EN
<INSTALLATION AND OPERATING PRECAUTIONS FOR TIIS FLAMEPROOF EQUIPMENT>
INSTALLATION AND OPERATING PRECAUTIONS
FOR TIIS FLAMEPROOF EQUIPMENT
Apparatus Certified Under Technical Criteria
(IEC-compatible Standards)
1. General
The following describes precautions on electrical
apparatus of flameproof construction (hereinafter
referred to as flameproof apparatus) in explosion-
protected apparatus.
Following the Labour Safety and Health Laws
of Japan, flameproof apparatus is subjected to
type tests to meet either the technical criteria for
explosionproof electrical machinery and equipment
(standards notification no. 556 from the Japanese
Ministry of Labour) (hereinafter referred to as
technical criteria), in conformity with the IEC
Standards, or the “Recommended Practice for
Explosion-Protected Electrical Installations in
General Industries,” published in 1979. These
certified apparatus can be used in hazardous
locations where explosive or inflammable gases or
vapours may be present.
Certified apparatus includes a certification label and
an equipment nameplate with the specifications
necessary for explosion requirements as well as
precautions on explosion protection. Please confirm
these precautionary items and use them to meet
specification requirements.
For electrical wiring and maintenance servicing,
please refer to “Internal Wiring Rules” in the
Electrical Installation Technical Standards as well as
“USER’S GUIDELINES for Electrical Installations for
Explosive Gas Atmospheres in General Industry,”
published in 1994.
To meet flameproof requirements, equipment that
can be termed “flameproof” must:
(1) Be certified by a Japanese public authority in
accordance with the Labour Safety and Health
Laws of Japan and have a certification label in
an appropriate location on its case, and
(2) Be used in compliance with the specifications
marked on its certification label, equipment
nameplate and precautionary information
furnished.
2. Electrical Apparatus of
Flameproof Type of Explosion-
Protected Construction
Electrical apparatus which is of flameproof
construction is subjected to a type test and certified
by the Japanese Ministry of Labour aiming at
preventing explosion caused by electrical apparatus
in a factory or any location where inflammable
gases or vapours may be present. The flameproof
construction is of completely enclosed type and
its enclosure shall endure explosive pressures in
cases where explosive gases or vapours entering
the enclosure cause explosion. In addition, the
enclosure construction shall be such that flame
caused by explosion does not ignite gases or
vapours outside the enclosure.
In this manual, the word "flameproof" is applied
to the flameproof equipment combined with the
types of protection "e", "o", "i", and "d" as well as
flameproof equipment.
3. Terminology
(1) Enclosure
An outer shell of an electrical apparatus, which
encloses live parts and thus is needed to configure
explosion-protected construction.
(2) Shroud
A component part which is so designed that the
fastening of joint surfaces cannot be loosened
unless a special tool is used.
(3) Enclosure internal volume
This is indicated by:— the total internal volume
of the flameproof enclosure minus the volume of
the internal components essential to equipment
functions.