Commissioning
36 - EN FEX300, FEX500 SM/FEX300/FEX500/FM/CSA-EN
7.4 Changing the type of protection
Models FEP315 / FEP515, FEH315 / FEH515, FEP325 / FEP525, FET325 / FET525 can
provide various types of protection during operation:
• When connected to an intrinsically safe circuit in Div. 1, operated as an intrinsically safe
device
• When connected to a non-intrinsically safe circuit in Div. 1, operated as a device with a
flameproof enclosure
• When connected to a non-intrinsically safe circuit in Div. 2, operated as a non-sparking
device
If a device which is already operational is required to provide a different type of protection, the
following measures must be implemented/insulation checks must be performed in accordance
with FM3600-ff.
A subsequent change of the type of protection is the sole responsibility of the operator.
No. 1. Type of protection 2. Type of protection Required step/check
1 Div. 1:
Device with flameproof
enclosure, non-intrinsically-
safe circuit
Div. 1:
Intrinsically safe circuits
• Switch off supply power.
Use 500 VAC or 710 VDC to take the following
measurements for one minute:
Jumper terminals 31/32, 41/42, 51/52, 81/82.
Then measure all jumpers (A,B,C,D) against one
another.
31 32 41 42 51 52 81 82
AB
C
D
G00884
• Switch off supply power.
Use 500 VAC or 710 VDC to take the following
measurements for one minute:
Jumper terminals 31/32, 41/42, 51/52, 81/82.
Then measure against the housing.
• Visual inspection
Div. 2:
Non-sparking
• Special precautions/checks are not necessary.
2 Div. 1:
Intrinsically safe circuits
Div. 1:
Device with flameproof
enclosure, non-
intrinsically-safe circuit
• Visual inspection (no damage to the threads of
the cover or the cable fittings)
Zone 2:
Non-sparking
• Special precautions/checks are not necessary.
3 Div. 2:
Non-sparking
Div. 1:
Intrinsically safe circuits
• Perform the checks described under No. 1.
Div. 1:
Device with flameproof
enclosure, non-
intrinsically-safe circuit
• Visual inspection (no damage to the threads of
the cover or the cable fittings)
31 32 41 42 51 52 81 82
G00885
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