14
Instruction Manual
IB015002EN
Effective November 2021
Pow-R-Line CS switchboards
EATON
www.EatonCanada.ca/PRLCS
Switchboard insulation resistance testing
Maintenance before cleaning
Prior to cleaning, perform an initial Megger or DC test of the
switchboard insulation, between phases and ground . Inspect for
symptoms which may indicate overheating or weakened insulation .
Record test readings .
Prior to testing, remove all control power fusing and connections
to products, which will be damaged in this test . This includes all
components with control wire fusing, Transient Voltage Surge
Suppression, Surge Protective Devices, metering equipment, etc .
WARNING
TO PREVENT DAMAGE TO GROUND FAULT CONTROL CIRCUITS,
METERING CIRCUITS, TRANSIENT VOLTAGE SURGE PROTECTION (TVSS)
OR OTHER CONTROL CIRCUITS, WHEN MEGGERING SWITCHBOARD,
ISOLATE CIRCUITS FROM SWITCHBOARD SYSTEM BEFORE BEGINNING
THE MEGGER OPERATION. BE SURETO RECONNECTTHOSE CIRCUITS
AFTER MEGGER TESTS ARE COMPLETED.
NOTE: SOME GROUND FAULT CIRCUITS MAY NOT BE FUSED,
THEREFORE ISOLATION OF THOSE CIRCUITS REQUIRES DISCONNECTING
WIRING FROM BUS BARS.
DO NOT USE AC dielectric testing.
WARNING
DO NOT USE ALTERNATING CURRENT (AC) DIELECTRIC/ MEGGER
TESTING. DAMAGE TO COMPONENTS WILL OCCUR.
Cleaning
While the switchboard is de-energized, remove dust and debris from
bus bars, connections, supports and enclosure surfaces . A vacuum
cleaner with a long nozzle will be of assistance . Wipe clean with a
lint-free cloth . Do not use solvents to clean equipment as damage to
surfaces can occur .
Should the switchboard be exposed to adverse conditions, such as,
airborne contaminants, more frequent inspections and cleaning may
be required .
WARNING
DO NOT USE COMPRESSED AIR TO CLEAN OR BLOW OUT DEBRIS OR
DUST IN SWITCHBOARDS.
Use of compressed air to clean or blow out debris in switchboards
may imbed the contaminants within overcurrent devices, metering
equipment and other components . Damage to insulation and other
surface materials can occur . Do Not Use Compressed Air in cleaning .
Switchboard insulation resistance testing
Maintenance after cleaning
After cleaning, perform a second Megger or DC test of the
switchboard insulation between phases and ground .
Prior to testing, remove all control power fusing and connections
to products, which will be damaged in this test . This includes all
components with control wire fusing, Transient Voltage Surge
Suppression, Surge Protective Devices, metering equipment, etc .
WARNING
TO PREVENT DAMAGE TO GROUND FAULT CONTROL CIRCUITS,
METERING CIRCUITS, TRANSIENT VOLTAGE SURGE PROTECTION (TVSS)
OR OTHER CONTROL CIRCUITS, WHEN MEGGERING SWITCHBOARD,
ISOLATE CIRCUITS FROM SWITCHBOARD SYSTEM BEFORE BEGINNING
THE MEGGER OPERATION. BE SURETO RECONNECTTHOSE CIRCUITS
AFTER MEGGER TESTS ARE COMPLETED.
NOTE: SOME GROUND FAULT CIRCUITS MAY NOT BE FUSED,
THEREFORE ISOLATION OF THOSE CIRCUITS REQUIRES DISCONNECTING
WIRING FROM BUS BARS.
DO NOT USE AC dielectric testing.
WARNING
DO NOT USE ALTERNATING CURRENT (AC) DIELECTRIC/ MEGGER
TESTING. DAMAGE TO COMPONENTS WILL OCCUR.
Test resulting in readings at or above 1 megaohm is satisfactory .
Compare these test readings with prior readings and retain with
previous testing for future comparisons . Trends of lowered insulation
resistance are signs of potential problems . A form is provided in the
Appendix to record readings .
Bus and cable connections
1.
Inspect bus bar and cables for visible damage .
2.
Visually inspect connections for overheating and damage .
3.
All bus bar and cable connections should be checked and
torqued in accordance with labeling on the switchboard . Refer to
Appendix
Table 2
for torque values .
4.
Inspect for broken wire strands and pinched or damaged
insulation on cable connections .
Insulation
All bus bar and structure insulation in the switchboard including bus
supports, bus shields, bus bracing, insulating barriers, etc ., should
be visually checked for damage . Replace damaged parts . The life
of insulation material is dependent on keeping the material dry and
clean .
