equipment shall conform to UL 294 and UL 1076.
2.1.2
Power Line Surge Protection
Equipment connected to alternating current circuits shall be protected fom
power line surges. Equipment protection shall withstand surge test
waveforms described in IEEE C62.41. Fuses shall not be used for surge
protection.
2.1.3
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
from console to field equipment, and between field equipment, 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 m 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.
2.1.4
Power Line Conditioners
A power line conditioner shall be furnished for the cosole equipment and
each local processor. The power line conditioners shall be of the
ferroresonant 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 plus or minus 1 percent of nominal when the input voltage
fluctuates between minus 20 percent to plus 10 percent of nominal.
b. During load changes of zero to full load, the output voltage shall
not deviate by more than plus or minus 3 percent of nominal. Full
correction of load switching disturbances shall be accomplished within
5 cycles, and 95 percent correction shall be accomplished within 2
cycles of the onset of the disturbance.
c.
Total harmonic distortion shall not exceed 3.5 percent at full load.
2.1.5
Field Enclosures
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NOTE: Show on the drawings which specific type of
enclosure is needed. Show metallic enclosures for
very high security areas or when a higher degree of
tamper protection is desirable.
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SECTION 13720A
Page 31
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