YOKOGAWA FVX110, User Manual

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<5. Installation>
5-2
IM 01S01C01-01EN
5.3 Wiring
5.3.1 Wiring Precautions
IMPORTANT
• Lay wiring as far as possible from electrical
noise sources such as large capacity
transformers, motors, and power supplies.
• Remove the electrical connection dust cap
before wiring.
• All threaded parts must be treated with
waterproofing sealant. (A non-hardening
silicone group sealant is recommended.)
• To prevent noise pickup, do not pass signal
and power cables through the same ducts.
• Explosion-protected instruments must
be wired in accordance with specific
requirements (and, in certain countries,
legal regulations) in order to preserve the
effectiveness of their explosion-protected
features.
• The terminal box cover is locked by an
Allen head bolt (a shrouding bolt) on ATEX
flameproof type indicators. When the
shrouding bolt is driven clockwise using
an Allen wrench, it goes in. The cover lock
can then be released and the cover can
be opened by hand. See subsection 10.2
“Disassembly and Reassembly” for details.
• Plug and seal an unused conduit connection.
5.3.2 Wiring Installation
(1) General-use Type and Intrinsically Safe
Type
With the cable wiring, use a metallic conduit or
waterproof glands.
• Apply a non-hardening sealant to the terminal
box connection port and to the threads on the
flexible metal conduit for waterproofing.
F0502.ai
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
Flameproof packing adapter
Figure 5.2 Typical Wiring Using Flexible Metal
Conduit
(2) Flameproof Type
Wire cables through a flameproof packing adapter,
or use a flameproof metal conduit.
■ Wiring cable through flameproof packing
adapter.
• Apply a non-hardening sealant to the terminal
box connection port and to the threads on the
flameproof packing adapter for waterproofing.
F0503.ai
Flameproof packing adapter
Flexible metal conduit
Wiring metal
conduit
Tee
Drain plug
Apply a non-hardening
sealant to the threads for
waterproofing.
Figure 5.3 Typical Cable Wiring Using Flameproof
Packing Adapter