6 |
P a g e
TERMINAL CONNECTIONS
The aluminum surface of the terminal
connection provides for easy current transfer.
Notice: In cases where a copper conductor is
used, bolt a tinned terminal clamp (if available)
to the aluminum switch terminal pad.
If a non-tinned terminal clamp is used, apply a
liberal amount of electrical joint grease at the
joint and all over the pad of the fitting.
To connect aluminum – to - aluminum
terminals:
1.
Clean all contact surfaces of conductors and
fittings using a stiff wire brush to remove
heavy oxide coatings until the aluminum
finish is visible and restored.
2.
Coat these now clean contact areas with a
liberal amount of corrosion inhibitor such as
NO-OX-ID”A Special” or No. 2 EJC.
3.
Abrade the contact surface through the
corrosion inhibitor again using the stiff wire
brush.
Notice: Do not remove the compound
.
4.
Connect the terminals and tighten bolts
To connect copper-to-aluminum terminals:
1.
Except for plated surfaces, clean all contact
surfaces of conductors and fittings using a
stiff wire brush to remove heavy oxide
coatings until the aluminum finish is visible
and restored.
2.
Prepare any bare copper surfaces in the
usual manner.
3.
Coat these now clean contact areas with a
liberal amount of corrosion inhibitor such as
NO-OX-ID “A Special” or no. 2 EJC.
4.
Abrade the contact surface through the
corrosion inhibitor using a stiff wire brush.
Notice: Do not remove the electrical joint
grease
.
5.
Connect the terminals and torque the bolts
as per Table 1.
MAINTENANCE
WARNING
Before servicing the switch, be sure it is
disconnected from all electric power
sources and properly grounded.
A certain amount of care and inspection is
recommended. The frequency of inspection
depends upon atmospheric conditions and
frequency of operation. The service interval is
largely determined by the user. Recommended
maintenance is similar to that listed in the latest
industry standards.
First, it is important that the
insulators are always clean. It is also important
that the contacts be examined to see that they are
aligned, clean, and have a firm uniform pressure.
If the contacts are pitted, or burned to some
extent, they should be removed and replaced.
Under normal service conditions, the jaw
contacts should be examined and maintained at
least once a year, depending upon the type of
atmosphere to which they are exposed.
Periodic maintenance should consist of cleaning
the contact surfaces thoroughly by carefully
scraping off any contamination or deposit and
sanding the surface entirely clean, a coating of
lubricant should be applied. Suggested
lubricants are MOBIL 28 grease of NO-OX-ID
“A Special”. MOBIL 28 is an Exxon Mobil
Company product. NO-OX-ID is made by
SANDCHEM INC.
In general, operating linkages require virtually
no maintenance. However, in contaminated
atmospheres of where operation under sleet
conditions is common some lubrication at pivot
points may be desirable. The grease used should
be durable even when exposed to the elements,
and should retain its viscosity over a wide
temperature range.
1
ANSI C37.35 (American National Standard Guide
for the Application, Installation, Operation and
Maintenance of High-Voltage Air Disconnecting and
Interrupter Switches)
