Circuits operating at any other voltage shall not have a voltage drop
exceeding 5 percent of nominal voltage.
2.20.1 Above Ground Sensor Wiring
Sensor wiring shall be 20 AWG minimum, twisted and shielded, 2, 3, 4, or 6
pairs to match hardware. Multi-conductor wire shall have an outer jacket
of PVC.
2.20.2 Direct Burial Sensor Wiring
Sensor wiring shall be 20 AWG minimum, twisted and shielded, 2, 3, 4, or 6
pairs to match hardware. The construction of the direct burial cable shall
be as specified in Section
27 15 19.00 10
WIRE LINE DATA TRANSMISSION
SYSTEM.
2.20.3 Cable Construction
All cable components shall withstand the environment in which the cable is
installed for a minimum of 20 years.
2.21 POWER LINE SURGE PROTECTION
Equipment connected to alternating current circuits shall be protected from
power line surges. Equipment protection shall withstand surge test
waveforms described in
IEEE C62.41.1
and
IEEE C62.41.2
. Fuses shall not be
used for surge protection.
2.21.1 Sensor Device Wiring and Communication Circuit Surge Protection
Inputs shall be protected against surges induced on device wiring. Outputs
shall be protected against surges induced on control and device wiring
installed outdoors and as shown. Communications equipment shall be
protected against surges induced on any communications circuit. Cables and
conductors, except fiber optics, which serve as communications circuits
between systems shall have surge protection circuits installed at each
end. Protection shall be furnished at equipment, and additional triple
electrode gas surge protectors rated for the application on each wireline
circuit shall be installed within
1 meter
3 feet
of the building cable
entrance. Fuses shall not be used for surge protection. The inputs and
outputs shall be tested in both normal mode and common mode using the
following two waveforms:
a. A 10 microsecond rise time by 1000 microsecond pulse width waveform
with a peak voltage of 1500 Volts and a peak current of 60 amperes.
b. An 8 microsecond rise time by 20 microsecond pulse width waveform with
a peak voltage of 1000 Volts and a peak current of 500 amperes.
2.21.2 Power Line Conditioners
A power line conditioner shall be furnished for equipment in each
subsystem. The power line conditioners shall be of the Ferro-resonant
design, with no moving parts and no tap switching, while electrically
isolating the secondary from the power line side. The power line
conditioners shall be sized for 125 percent of the actual connected kVA
load. Characteristics of the power line conditioners shall be as follows:
a. At 85 percent load, the output voltage shall not deviate by more than
SECTION 34 41 26.00 10 Page 43