measured heat supply and molds designed for the conductors joined. Perform
brazing process with operators experienced in work of a similar character
and in a manner that will not damage the parts joined. [Approved splice
cap swaged spike terminations, insulation wrapped and epoxy potted, may be
substituted for welded and brazed connections.]
3.7
CORROSION AND FUNGUS PREVENTION
Protect metallic materials against corrosion. Coat outdoor equipment with
a rust inhibiting treatment and standard finish by the manufacturer. Do
not use aluminum in contact with the earth. Protect dissimilar metals with
approved fittings and treatment. Coat steel conduits installed underground
with an approved asphaltic paint or plastic coating, or wrap with a single
layer of a pressure sensitive plastic tape, half-lapped. Protect
components against corrosion and fungus. Coat printed circuit board with
epoxy.
3.8
FIELD QUALITY CONTROL
3.8.1
Tests During Installation
Conduct the following tests during installation of wiring and system
components. Correct deficiencies prior to formal functional and
operational tests of the system. Tests shall include meggering system
conductors to determine that system is free from grounded or open circuits.
Complete the megger test prior to installation of fire alarm equipment.
3.8.1.1
Ground Resistance Tests
Resistance of each connection to ground shall be measured and not exceed 5
ohms.
3.8.1.2
Dielectric Strength and Insulation Resistance Tests
Test dielectric strength and insulation resistance of the system
interconnecting wiring by means of an instrument capable of generating 500
V dc and equipped to indicate leakage current in terms of resistance.
Provide test instrument capable of indicating 1000 megohms. For the
purpose of this test, connect the instrument between each conductor on the
line and between each conductor and ground at the control panel end of the
line, with the other extremity open-circuited and series-connected devices
in place. The system shall withstand the test without breakdown and
indicate a resistance of not less than 500,000 ohms, the measurement being
taken after an electrification of not more than one minute with a dc
potential of not less than 100 volts nor more than 550 V dc.
3.8.1.3
Power Supply Tests
Conduct a complete test of the power supply including rectifier, charging
rates, and automatic controls. Record operating input and output line
voltages and current (load) at the time of the tests.
3.8.1.4
Supervisory Features and Trouble Alarm Circuit Test
Make detailed tests of supervisory features and trouble alarm circuits and
SECTION 13851N
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