The controller outer case is now ready for installation.
7.3.3 Removal of Stool from Outer case
This action may not be necessary as some controllers are delivered to site with the
stool already separate from the outer case ready for installation. If they are
assembled, separate the stool by removing its four nuts, bolts and washers and lift
the rest of the assembly off the stool.
The recommended method of installation is to install the stool without any CET bars
or Master Switch Panel.
As an alternative the outer case, stool and CET bar(s) only may be installed as a
complete assembly. However, firstly the outer case and stool must be separated to
fit the seal.
7.3.4 Removal of CET bars
The CET bars are fitted to the outercase by nuts, bolts and washers, which should
be removed and stored with the bars.
7.3.5 Installation of Stool
A hole should be dug and a flagstone at least 900mm x 600mm embedded securely
at the bottom of the hole. Refer to Figure 49 for the general method of installation
and dimensions. Ensure that enough clearance is left around the stool to enable the
fitting of the CET bars and outercase fixings.
If the controller is being installed on a slope, allowance must be made for the
opening of the door adjacent to the uphill side.
The controller stool is placed in the centre of the flagstone with the top surface
between 50 and 75 mm above the final ground level. It is essential that the stool be
fitted the correct way round with the holes to the front, as shown in Figure 49.
Adjustment may be required to ensure that the outercase sides are vertical; this
should be checked using a spirit level.
Mix up a stiff mixture of concrete (mix: 1 cement, 3 sand, 4 coarse aggregate
(20mm) with no excess water) and cover the flagstone to a height approximately
100mm (4") above the bottom of the stool. The concrete must be sloped to provide
a run up for the cables. Any cables already entering the pit must be held away from
the wet concrete. Where there is a risk of freezing, then a suitable antifreeze
additive shall be incorporated in the concrete mix to ensure proper curing.
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