Installation Guide

Table Of Contents
TETRA MBS UNIT. INSTALLATION GUIDE
F067646PT_2801
Page 54 of 62
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o Push the insert back into the hood/housing.
o Fix the assembly tightening the top locking screw and tightening the cable gland nut
on the back of the hood/housing.
MBS Unit with DC power supply source:
- Nominal voltage: 24 VDC (Range: from 21.6 to 31.2 VDC).
- Use the power cable connector provided with the MBS Unit to connect the MBS Unit to
the power supply source. Use a cable of 3 wires with weather protection and the
following features:
Cable diameter: 0.39 in - 0.55 in.
Cable section: 6 mm
2
(AWG 9) (0.6/1KV).
Maximum cable length
1
:
One MBS Unit: 92.96 yd
Two MBS Units: 45.93 yd
UL VW-1 certified power supply cable is needed
- Ensure that the connection is made in the correct way (Positive, Negative and Earth)
following the next steps:
o Strip cable and wires (stripping length 0.31 in - 0.35 in).
NOTE: The Earth cable must be 0.08 in longer.
1
The greater the cable length, the greater the voltage drop in it. The specified length has been calculated to ensure minimum
operating voltage of the MBS Unit, assuming a minimum voltage of 24V at the output of the power system and a typical resistivity of
copper wire ≤ 0.0172 Ω mm
2
/m
8-9 mm