12 NAL/NALF – Mounting and operation manual
7.0 Mounting of earth switch type E (Fig. 32) and earth
switch type LCES (Fig. 33)
The switch will normally be delivered for connection of the hand
operating mechanism on the right hand side and any mechanical
interlook on the left side. The splined extension intended for con-
nection to the hand operating mechanism will have free travel.
The extension for the interlook will be bolted to the shaft,
see Fig. 32.
7.1. Mounting the earth switch to the switch-disconnector
type NAL
The contacts A are mounted on the terminals of the switch
disconnector, and the surfaces of the main contacts are then
covered by contact grease. (Recommended grease: ISOFLEX
TOPAS NCA 52).
Close the earth switch slowly and adjust the fixed contacts to line
up correctly with moving contacts. Tighten the contacts screws.
7.2 Mounting the earth switch to the fuse-switch
disconnector type NALF
Proceed as under item 7.1. The contacts A must be mounted
on the terminals of the fuse base, and secured in position with
tension bushes.
8.0 Mounting the mechanical interlock between switch di-
sconnector and earth switch. Fig. 32-34
The switch disconnector must be in the open position (for NAL-A
the opening spring must be charged before assembly of the inter-
lock, see item 2.1.).
The earth switch must also be in the open position. Put one half
of the guide A (side plate) on the operating shafts of the switches.
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. 34.
Do not forget to mounting the two distance rings E on the two
screws F.
Fig. 32 Earthing switch type E mounted on the NAL switch disconnector | Fig. 33 Earthing switch type LCES | Fig. 34 Mechanical interlick for
earthing switch
Fig. 32
Fig. 34
Fig. 33
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