Samson 3730-1 - Page 67

EB 8384-1 EN 67
Mounting and start-up
Selecting cables and wires
Observe Clause12 of EN60079-14 for in-
stallation of the intrinsically safe circuits.
Clause12.2.2.7applieswhenrunningmulti-
core cables or wires with more than one in-
trinsically safe circuit.
The radial thickness of the insulation of a
conductor for common insulating materials
(e.g. polyethylene) must not be smaller than
0.2mm.Thediameterofanindividualwire
inane-strandedconductormustnotbe
smallerthan0.1mm.Protecttheconductor
ends against splicing, e.g. by using wire-end
ferrules.
When two separate cables or wires are used
for connection, an additional cable gland
can be installed. Seal cable entries left un-
used with plugs. Fit equipment used in ambi-
ent temperatures below –20°C with metal
cable entries.
Equipment for use in zone2/zone22
In equipment operated according to type of
protectionExnA(non-sparkingequipment)
accordingtoEN60079-15,circuitsmaybe
connected, interrupted or switched while en-
ergized only during installation, mainte-
nance or repair.
The special conditions of use mentioned in
the statement of conformity are to be ob-
served for the rated values and the installa-
tion of the series-connected fuse for intercon-
nectionofExnAcircuits.
ForExnAequipment(non-sparkingequip-
ment), circuits may be connected, interrupted
or switched while energized only during in-
stallation, maintenance or repair.
− PositionerswithtypeofprotectionExnA
orExtccanbeusedwithaclosedcover
(no window) or or with a cover with win-
dow.
− TheTypes3730-11,3730-15and3730-
18Positionersare100%identicalinde-
sign, except for the marking and the
housing cover.
− The signal current circuit must be con-
nected in series with a fuse according to
IEC60127-2/VI,250VTwithafuse
rating of I
N
≤63mA.
The fuses must be installed outside the haz-
ardous area.