Securitron iMXDa_iEXDa INSTALLATION - Manual (Page 15)

P/N 500-22175
Page 15 Rev. B, 04/11
APPENDIX B
Wire Gauge Factoring
Remote Power Supply
 The iMXDa/iEXDa requires adequate voltage and current for proper operation.
 Resistance is created by the length and gauge (size) of the wire being used.
 An accurate estimated distance from the power supply to the opening is crucial.
 For optimum operation the correct size gauge wire must be used.
 The devices used operate the best with the least amount of resistance on the source.
 Using the correct gauge wires protects against large voltage and current (load) losses.
 The gauge is determined by the wire distance, voltage and current of all devices.
Determining Wire Gauge
 Follow Example A (12VDC system) and Example B (24VDC system) below.
 Use Table B-1 and Table B-2 to determine the correct wire gauge for the application.
Example A: (an iMXDa used in a 12VDC system)
Devices Used Amps (12VDC) Progressive Totals
iMXDa 0.370 0.370
DK-26 Access 0.160 0.530
MK Bypass/Reset 0.020 0.550
Total Current Rounded Up (Table 1) 0.600A
Using Table B-1 (12VDC) Find: - Current Draw .600 Amps
- Wire Distance 200 Feet (One-Way)
Solution: 18 Gauge is indicated for proper installation
Example B: (an iEXDa used in a 24VDC system)
Using Table B-2 (24VDC) Find: - Current Draw .400 Amps
- Wire Distance 200 Feet (One-Way)
Solution: 22 Gauge is indicated for proper installation
TO SOLVE: INTERSECT ROW (Current) and INTERSECTING COLUMN (Wire Distance)
CURRENT WIRE GAUGE
1.000A 20 18 16 14 14 12 10 10 8
.800A 22 18 18 16 14 12 10 10 8
.600A 22 20 18 18 16 14 14 12 10
.400A 22 22 20 18 18 16 14 14 12
.300A 24 22 22 20 18 18 16 14 14
.200A 24 22 22 22 20 18 18 16 14
50’
[15m]
100’
[30m]
150’
[46m]
200’
[61m]
300’
[91m]
400’
[122m]
500’
[152m]
750’
[229m]
1000’
[305m] 12VDC
WIRE DISTANCE
Table B-1
CURRENT WIRE GAUGE
Devices Used 24VDC Amps Progressive Totals
iEXDa 0.270 0.270
TSB Touch Bar 0.025 0.295
DK-11 Access 0.070 0.365
Total Current Rounded Up (Table 2) 0.400A