MICC gland

The next step is to push the pot over the end of the cable. It is made to suit the cable and
is a fairly tight fit, so that it has to be screwed on. It is screwed on until the cable sheath is
level with the shoulder at the base of the pot. The pot is then packed with a plastic
compound, which is pressed firmly in to fill the whole of the pot. The cap and sleeve subassembly
is now pushed over the ends of the cables and forced into the end of the pot,
which is crimped over the cap. This final operation can conveniently be done with a
combined compression and crimping tool specially made for this particular job. It is good
practice to test each end for insulation resistance after the end has been made off; if the
test is left until both ends are complete, there is no way of knowing which end is faulty
should one of the ends be made off incorrectly.
The gland is shown in Figure 3.19. It consists of a gland body, a compression ring and
a gland nut. The compression ring is comparatively soft and as the nut is tightened onto
the body the ring is compressed between them and deforms. As it does so, the weakened
ridge on its inside diameter bites into the outside of the cable sheath and makes a firm
electrical and mechanical bond between the sheath and the gland. The gland is thus fixed
to the cable over the seal and has a projecting male thread which can be inserted into a
luminaire or conduit box and secured by a ring bush and back nut. For hazardous areas a
special gland is required