Manual | MNS-SG Operation and Maintenance 43
6.7.3.
18-to-36 month inspection
Perform the following at 18-to-36 month intervals or sooner
if required by local conditions or regulations.
-
Clean the circuit breaker stationary primary contacts.
See document 1SDH001000R0002 Emax 2 UL Listed
Breaker
Installation,
Service
and
Maintenance
Instructions. Inspect for evidence of excessive heat,
arcing, or corrosion.
-
Inspect secondary wiring bundles for signs of
discoloration because of heat or chafing. Check for
cracked or embrittled insulation. Replace wire whenever
doubtful.
-
Inspect primary insulation system for accumulated
contamination. Clean insulation with a dry cloth, dry-air,
vacuum or, if necessary, with an OSHA- approved solvent.
-
Check the calibration of protective relays approximately
every two years.
6.7.4.
10-year maximum inspection
-
Disassemble, inspect, clean, lubricate, adjust, and
calibrate circuit breaker mechanisms.
-
Tighten all secondary control wire connections. Check for
loose lug crimps and broken wire strands.
6.7.5.
Eslok® fasteners
The Eslok® fasteners provided with the switchgear include
an integrated, dry, polyamide- based, securing- varnish,
thread-coating that ensures they will remain at the torqued
valued. Any other polyamide product of same quality
characteristic can be used. Do not use additional locking
fluid.
Bus connections are maintenance-free and do not require
routine inspections. The fasteners can be re-torqued as
many as 10 times and still offering sufficient thread locking
effect.
Defects or deficiencies in any electrical equipment should
be remedied immediately. If immediate repair is not
possible, lockout/tagout the equipment until after repairs
have been made or the components replaced.
6.8.
Arc flash protection
The National Fire Protection Association (NFPA 70E) flash
protection marking requirement
1
applies to personnel who
install, maintain, or repair electrical systems.
(1 Standard for Electrical Safety Requirements for Employee Workplaces.)
NEC Article 110.16 Flash Protection: Switchboards,
panelboards, industrial control panels, and switchgears
that are in other than dwelling occupancies and are likely to
require examination, adjustment, servicing, or maintenance
while energized shall be field marked to warn qualified
persons of potential electric arc flash hazards. The marking
shall be located so as to be clearly visible to qualified
persons before examination, adjustment, servicing, or
maintenance of the equipment.
FPN No. 1: NFPA 70E-2000, Electrical Safety Requirements
for Employee Workplaces, provides assistance in
determining severity of potential exposure, planning safe
work practices, and selecting personal protective
equipment.
FPN No. 2: ANSI Z535.4-1998, Product Safety Signs and
Labels, provides guidelines for the design of safety signs
and labels for application to products.
The flash criteria are regularly updated as the technology
changes. The latest editions of the NEC and NFPA 70E
should be used in establishing potential electric arc flash
hazards and arc flash marking.
The required flash protection marking is to be applied by
the switchgear end-user for each installation. It is similar to
other NEC marking requirements such as voltage, voltage
hazard labels, and circuits. Flash protection markings,
however, must be based on application information and
calculations from the installation site. This information
helps to identify the presence of a potential flash hazard
and provides guidance in determining necessary personal
protective equipment (PPE) to be worn by installation and
maintenance personnel.
You must establish field marking requirements based upon:
-
Level of onsite personnel safety training.
-
Level of required clothing and required PPE.
-
Consistency for the level of marking for various
equipment
types,
for
example:
switchboards,
panelboards, industrial control panels and MCCs.
-
Available flash energy on each piece of equipment as
determined by available fault current and arc flash
duration based on the type and degree of short circuit
protection equipment.
!
WARNING
