Mounting The Earthing Switch To The Fuse- Switch Disconnector Type Nalf/Vr; Mounting The Mechanical Interlock Between Switch-Disconnector And Earthing Switch. Fig; Testing The Interlock - ABB NAL Series Installation And Operating Instructions Manual

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WARNING!
By default earthing switch is configured to
be operated on the right hand operating
side. Changing side of operation require
shaft extension adjustment – see point
"Shaft extension adjustment"
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48 The switch-disconnector and earthing switch must be in the
open position. In case of switch-disconnectors with mechanism
A, the opening spring must be charged before assembly of the
interlock, (see item "Preparation of the switch for installation.").
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50 Mechanical interlock
14.3 Mounting the earthing switch to the fuse-
switch disconnector type NALF/VR
Proceed according to item "Mounting the
earthing switch to the switch- disconnector type
NAL/VR". The contacts A must be mounted on the
terminals of the fuse-base, and secured in
position with tension.
14.4 Mounting the mechanical interlock between
switch-disconnector and earthing switch. Fig.
47, 49, 50.
Interlock on the
opposite side of
operating side
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49 Mechanical interlock must be installed on the
opposite side of the operating drive side
In case of earthing switch, the knurled end shaft
on which the mechanical interlock is installed,
must be mounted on the earthing switch shaft
using the short hole. Put one half of the guide A
(side plate) on the operating shafts of the
switches.
Do not forget to mount the two distance rings E
on the two screws F.
Mount the interlock connection B. Mount the
interlock rings C and D on the shafts with the flat
part of the ring facing towards the interlock
connection B, see Fig.50.
Do not forget to mount the two distance rings E
on the two screws F.

14.5 Testing the interlock

It shall not be possible to close the switch-
disconnector when the earth switch is closed. It
shall not be possible to close the earth switch-
disconnector when the switch is closed.
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51 Earthing switch type EB12
33