Alstom MiCOM P846, Technical Manual

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P846/EN IN/D Installation
(IN) 15-6 MiCOM P846
Note: Conventional self-tapping screws, including those supplied for
mounting MIDOS relays, have marginally larger heads which can
damage the front cover moulding if used.
Once the tier is complete, the frames are fastened into the racks using mounting angles at
each end of the tier.
Figure 2: Rack mounting of relays
Relays can be mechanically grouped into single tier (4U) or multi-tier arrangements by
means of the rack frame. This enables schemes using products from the MiCOM and
MiDOS product ranges to be pre-wired together prior to mounting.
Where the case size summation is less than 80TE on any tier, or space is to be left for
installation of future relays, blanking plates may be used. These plates can also be used to
mount ancillary components. Table 1 shows the sizes that can be ordered.
Note: Blanking plates are only available in black.
Further details on mounting MiDOS relays can be found in publication R7012, “MiDOS Parts
Catalogue and Assembly Instructions”.
Case Size Summation Blanking Plate Part Number
5TE GJ2028 101
10TE GJ2028 102
15TE GJ2028 103
20TE GJ2028 104
Table 1: Blanking plates
IN