Honeywell FSL100-UVIR - Electrical Installation

INSTALLATION
MAN0987_Iss 2_09/16
15
FSL100 Series Flame Detectors
Technical Handbook
5 Electrical Installation
5.1 Power Supply
Typical Cable Data
Maximum Cable Length (L)
Cable size
(cross sectional area)
Cable resistance
Ω/km (Ω/mile)
Metres
Feet
0.5 mm
2
≅ 20 AWG
36.8 (59.2)
245
808
1.0 mm
2
≅ 17 AWG
19.5 (31.4)
462
1516
1.5 mm
2
≅ 16 AWG
12.7 (20.4)
709
2326
Table 1. FSL100 Cable Data
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
2
(16 AWG).
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.