Table of Contents
Advertisement
8
sYsTem TesTing
Warning: fire hazard in hazardous locations. megger tests
can produce sparks. be sure there are no flammable vapors in
the area before performing this test
(hot work permit).
8.1 Testing of insulation resistance and
conductor resistance
Pentair Thermal Management recommends insulation resistance test
before installing heating cable, while the cable is still on
the reel
before installing thermal insulation
prior to initial start-up/ after completion of thermal insulation
as part of the periodic maintenance (see Section 9.2).
The heating circuit electrical resistance needs to be measured and
compared to the design documentation before initial startup.
8.2 Test method for insulation resistance testing
After completing heating cable installation, the insulation resistance
between the conductor and the outer sheath has to be tested (see
Section 6.1).
all mineral insulated heating cables:
use a minimum testing voltage of 500V and not more than
1000 V DC (between conductor and metal sheath).
for hazardous areas a testing voltage of 1000V DC is recommended.
Minimum readings should be ≥20 MΩ for new heating units. The installer
should record the values for each circuit on the installation record sheet.
32
Advertisement
Table of Contents
