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Yokogawa UYFA21 Ultrasonic Vortex Flowmeter Manual

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EX-B01E 1
IM 1F5B2-01E
INSTALLATION AND OPERATING PRECAUTIONS FOR JIS FLAMEPROOF EQUIPMENT
INSTALLATION AND OPERATING PRECAUTIONS
FOR JIS 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 sub-
jected 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 Installa-
tions 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.
3. Terminology
(1) Enclosure
An outer shell of an electrical apparatus, which encloses live parts and thus is needed
to configure explosion-protected construction.
… 80 …


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