Preparation, Mixing And Pouring Of Bicc Bi-Cast Acrylic Resin - Siemens BH17 7ER Installation Manual

Cut the stepped ends of the shell halves so that they fit over the outer
insulation of the cable and the bundle of detector loop tails without
interference but, at the same time, giving minimum clearance in order to avoid
eccentricity.
Continue as described in section 3.2.1.

3.2.3 Preparation, Mixing and Pouring of BICC Bi-Cast Acrylic Resin

The resin is provided as a two-part mix. The powder component is in a plastic
bag and the liquid component in a tin.
Check the last two digits of the style reference numbers are identical, e.g.
BC 73190 - 57 (Powder)
BC 73195 – 57 (Liquid)
If the last two digits are not the same, on no account should they be mixed
together.
Check that the use-by date printed in the powder label has not been
exceeded.
Mixing must take place away from naked lights. Avoid exposure of the tin to
hot sun as heat could cause a pressure build-up in the tin. In the event of
such exposure the tin of liquid should be pierced at arms length to guard
against a jet of wet vapour onto the face.
Carefully unfasten the bag, unroll the free end and remove the clip.
Allow air into the bag and re-roll the open end several times round the clip to
effect a seal and entrap air.
Grip the bag securely at each end and up-end it 4 or 5 times to disturb the
powder settlement, paying particular attention to the bag corners.
Open the tin of liquid, unroll and open the bag. Pour all the contents of the tin
into the bag ensuring spillage of liquid does not occur.
Fold the corners of the bag to the middle and roll around the clip several times
to effect a seal and entrap air.
Grip the bag securely at each end and thoroughly mix the liquid and powder.
This is best achieved by holding the bag vertically for ¼ minute to allow the
powder to settle into the liquid, shaking the bag top to dislodge powder from
the corners and repeatedly oscillating the bag through 180 degrees with a
tumbling action (speeding up as mixing progresses) for ½ minute. Finish off
with a more vigorous end to end shaking of the bag for a further ¼ minute.
Remove the clip and re-wrap it diagonally across the corner of the open end
of the bag to provide a convenient sized pouring hold and handle to assist the
pouring operation. The resin should be poured through the filling port
immediately after mixing. Top up if necessary.
Fit the cover plate.
Adequately support the joint both underneath at each end before backfilling
the joint hole. Backfilling may take place immediately or be delayed until the
resin has set hard.
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