Page 306 - Offshore Electrical Engineering Manual

Ships 293

PANEL NOTE 3
INDIVIDUAL SCREEN WIRE ISE
IE

PE

NOTE 1
PE

PRIME STRUCTURE

FIELD:

ARMOURED MULTICORE CABLE WITH
FIELD JUNCTION BOX: INDIVIDUAL SCREEN
BRASS GLAND
TO STRUCTURE
NON METALLIC BOX 2
10 MM CU
2
2.5 MM CU INIVIDUAL SCREEN WIRE
+ - + - NOTE 1
BRONZEPLATE
ISOLATED EARTHING
TERMINAL ISE
2
10 MM CU EARTH BOSS WELDEO
FIELD INSTRUMENT: TO STRUCTURE

METALLIC BOX WITH NON METALLIC BOX STRUCTURE
EARTH STUD WITH EARTH TAG
ISOLATED SCREEN

TYPICAL IS CIRCUIT

FIGURE 5.2.3
Typical instrument panel intrinsically safe (IS) earthing. Note 1, if the enclosure is made
from metal <3 mm, a glandplate of minimum thickness 3 mm is to be provided; Note 3, IS
instrument and electrical earth bars to be provided with linking bars. Instrument bar to be
mounted on insulators.