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38 kV Type VCP-WHD Simple Electrical
Ground & Test Device (SEG&TD) upper
terminal instruction booklet
Figure 10. Typical two cylinder lock (38 kV SEG&TD Lock #1
shown with one key in the "Locked" position).
In a two cylinder lock, one key must be inserted and turned to
the "locked" position to enable the other key to be turned to the
"unlocked" position. The key that is in the "locked" position can be
removed from the lock. When one cylinder is in the "Locked" posi-
tion with the key removed, the key in the second cylinder cannot be
turned or removed from the cylinder.
Figure 11. Typical two cylinder lock with one key in the "Locked"
position and one key in the "Unlocked" position with the key
ready for removal (38 kV SEG&TD Lock #4 shown).
2.3.3
Mechanical lift lock
The mechanical lift lock prevents the operation of the "Push to
Open" and "Push to Close" buttons. To activate the lift lock, slide
the left lock plate up until the hole in the plate aligns with the hole in
the right lock plate. Install a customer-supplied pad lock through the
holes in the left and right lock plates to lock the plates together.
Figure 12. Activating the mechanical lift lock.
2.4 38 kV SEG&TD interlock functions
There are five interlocks located on the front of the 38 kV SEG&TD
(see Figure 13)
Lock 5
Lock 2
Lock 3
Figure 13. Location of the five interlocks on the front of the
38 kV SEG&TD.
2.4.1
Lock #1 (keys KU and KB)
The Lock #1 interlock is a two cylinder transfer lock associated with
a switch that is used to electrically enable or disable the electrically
operated (E.O.) 38 kV SEG&TD. The switch is electrically disabled
when key KU is inserted, turned, and retained in the "Unlocked"
position. The switch is electrically enabled when key KB is inserted,
turned, and retained (see Figure 14).
IB131012EN
Effective March 2016
Lock 4
Lock 1
EATON www.eaton.com
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