10
Figure 4.10: Fitting IMB57
Slide a straight earth-rail bracket ERB57S into the upper slot in each mounting block. Push two
plastic push fasteners into each bracket to locate the brackets in the mounting blocks.
Cut earth rail ERL7 to the length needed. Slide the required number of ETM7 earth terminals
(5mm or 7mm wide) onto the rail. Clamp each end of the earth rail to earth-rail brackets ERB57S
using the terminal clamps (14mm, 35mm
2
) supplied. Fit an earth clamp (10mm, 16mm
2
) to the
free end of each earth-rail bracket.
Note: For lengths of earth-rail greater than 500mm, provide additional support by installing a
third IMB57 mounting block and earth-rail bracket, mid-way between the end mounting blocks.
Snap out the perforated extension between the lugs on this mounting block if a continuous
tagging strip is to be fitted (see figure 4.6).
b) In lower position, where at least 150mm clearance exists on one side, measured from the
edge of the mounting block.
As for a), but slide earth-rail brackets ERB57S into the lower slots in each mounting block.
c) In lower position, where there is insufficient clearance to fit earth-rail brackets ERB57S.
As for a), but slide offset earth-rail brackets ERB57O into the upper slot in each mounting
block before assembling the mounting blocks to the DIN rail. ERB57S brackets cannot be used
because they obscure the fixing screws on the mounting blocks.
4.3.2.2 Fitting tagging strips
Assemble mounting blocks IMB57 to the DIN rail as above. Cut TAG57 tagging strip and label to the
length needed, and insert label so that the appropriate side is visible. Clip the strip onto the lugs on
the mounting blocks. Hinge up the strip to provide access to the tops of the isolators.
Note: If necessary, provide additional support for long lengths of tagging strip by installing an
extra IMB57 mounting block mid-way between the end mounting blocks. Snap out the perforated
extension between the lugs on this mounting block.
4.3.3 Completed assemblies
Figure 4.11 illustrates a complete assembly of MTL5500 isolators using the accessories mentioned
above.
The broken-line boxes either side of the assembly represent cable trunking, and the accompanying
dimensions represent the recommended minimum spacing between the trunking and the module
assemblies.
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