S&C Mark V Instruction Sheet

10 S&C Instruction Sheet 711-590
Inspection Recommendations
Table 2� Recommended Inspection Procedures for S&C Mark V Circuit-Switcher Components—Continued
Component Inspection Procedures
Disconnect
live parts
1� Check for evidence of damage, excessive corrosion, or wear—especially at the fault-closing contacts and current-carrying contacts�
Replace current-carrying jaw contacts if the silver-alloy inserts on two or more contact fingers are worn to the extent the blade
tongue contact engages the full width of the contact finger�
2� Check the fastener tightness on current-carrying parts�
3� Observe operation during slow, manual cranking using the switch operator manual operating handle� Check for proper contact
alignment�
4� Lubricate the contact surfaces with an appropriate lubricant�①
Pre-insertion
inductor
1� Clean the exterior finish of inductor windings using a mild soap and water solution and a soft cloth� Inspect the fiberglass roving for
damage or wear� Use a mild soap and water solution and a clean cloth to clean the exterior finish of the inductor winding� While
cleaning the windings, inspect for damage or exposure of the fiberglass roving�
2� If the fiberglass roving is damaged, use the touch-up kit, S&C catalog number SA-42721, to refinish any damaged surfaces� First,
thoroughly wire-brush the surface to be refinished� Then, sand with No�1 sandpaper and No�0 sandpaper to create a smooth surface�
Brush on the paint according to the directions on the label and let dry for six hours� If the coiled conductor beneath the fiberglass
roving is exposed, remove the inductor from service and contact your nearest S&C Sales Office for a replacement.
3� Inspect the moving and stationary arcing rods to verify their proper setting� Replace the arcing rods if they show significant wear or
erosion�
Bypass
accessory
1� Check for evidence of damage, excessive corrosion, or wear�
2� Check the fastener tightness on current-carrying parts�
3� Observe operation using the stick-operated ratchet mechanism� Check for proper contact alignment�
4� Lubricate the contact surfaces with an appropriate lubricant�①
Grounding switch
1� Check for evidence of damage, excessive corrosion, or wear— especially at the jaw-contact members�
2� Check the fastener tightness on current-carrying parts�
3� Observe operation using manual operating handle� Check for proper contact alignment�
4� Lubricate the contact surfaces with an appropriate lubricant�①
① Shell Gadus® S2 U1000 2 Lubricant, catalog number 9999-043, is
available in 1 oz� tubes from S&C� Shell Darina SD2, Dow 33, or equivalent
can be substituted�
Resistance Values
The allowable resistance values indicated in Table 3 on
page 11 and Table 4 on page 12 are provided for the
convenience of users whose practices include measuring
and recording the resistance over current-carrying and
current-interrupting components of a circuit-switcher.
Such measurements are not required to fulll the terms
of S&C’s circuit-switcher warranty and should only be
made by qualied personnel fully trained in the measur-
ing equipment and the techniques for making resistance
measurements on high-voltage equipment. The measure-
ments can be used to identify areas of high resistance, to
be remedied by cleaning and maintenance, or component
replacement.

S&C Mark V Specifications

General

Brand	S&C
Model	Mark V
Category	Switch
Language	English