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5 Electrical Installation
5.1 Power Supply
Cable size
(cross sectional area)
2
0.5 mm
2
1.0 mm
2
1.5 mm
Note: Safety margins should include an allowance for resistance changes due to changes in T ambient over time. I.e. Higher
temperature = higher resistance, while resistance may increase due to oxidation or loss of ductility over time.
5.2 Cabling Recommendations
The FSL100 Flame Detector is supplied fitted with a suitable gland. The use of industrial grade, screened and suitably armoured
field cable is recommended.
For example, three core copper cable, with screen (90% coverage) and suitable mechanical protection (i.e. insulated steel wire
armour) to suit M20 gland entry.
The maximum conductor size for the terminals is 1.5 mm
Ensure the cable gland is installed correctly and fully tightened. All unused cable/conduit entries must be sealed with a suitable
certified sealing plug.
5.3 Earth (Ground) Regimes
Please note:
Controllers should be connected to protective earth (ground) via an isolator switch that cannot disconnect the earth line.
Field cable screens should be connected to instrument earth (ground) in the controller only. The other end of the field cable
screen shall be cut and isolated.
Field cable armour / conduit shall be insulated from the cable screening and earthed (grounded).
Avoid earth (ground) loops at all times.
MAN0987_Iss 2_09/16
INSTALLATION
Typical Cable Data
Cable resistance
Ω/km (Ω/mile)
≅ 20 AWG
≅ 17 AWG
≅ 16 AWG
Table 1. FSL100 Cable Data
36.8 (59.2)
19.5 (31.4)
12.7 (20.4)
2
(16 AWG).
15
Maximum Cable Length (L)
Metres
Feet
245
808
462
1516
709
2326
FSL100 Series Flame Detectors
Technical Handbook
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