P341/EN O/B11 Operation Guide
CHAPTER 2 Installation
Page 4/10 MiCOM P341
3. STORAGE
If relays are not to be installed immediately upon receipt, they should be stored in a
place free from dust and moisture in their original cartons. Where de-humidifier
bags have been included in the packing they should be retained. The action of the
de-humidifier crystals will be impaired if the bag is exposed to ambient conditions
and may be restored by gently heating the bag for about an hour prior to replacing it
in the carton.
To prevent battery drain during transportation and storage a battery isolation strip is
fitted during manufacture. With the lower access cover open, presence of the battery
isolation strip can be checked by a red tab protruding from the positive side.
Care should be taken on subsequent unpacking that any dust which has collected on
the carton does not fall inside. In locations of high humidity the carton and packing
may become impregnated with moisture and the de-humidifier crystals will lose their
efficiency.
Prior to installation, relays should be stored at a temperature of between –25º to
+70ºC.
4. UNPACKING
Care must be taken when unpacking and installing the relays so that none of the
parts are damaged and additional components are not accidentally left in the
packing or lost.
Note: With the lower access cover open, the red tab of the battery
isolation strip will be seen protruding from the positive side of
the battery compartment. Do not remove this strip because it
prevents battery drain during transportation and storage and will
be removed as part of the commissioning tests.
Relays must only be handled by skilled persons.
The site should be well lit to facilitate inspection, clean, dry and reasonably free from
dust and excessive vibration. This particularly applies to installations which are being
carried out at the same time as construction work.
5. RELAY MOUNTING
MiCOM relays are dispatched either individually or as part of a panel/rack assembly.
Individual relays are normally supplied with an outline diagram showing the
dimensions for panel cut-outs and hole centres. This information can also be found
in the product publication.
Secondary front covers can also be supplied as an option item to prevent
unauthorised changing of settings and alarm status. They are available in sizes 40TE
(GN0037 001) and 60TE (GN0038 001).
The design of the relay is such that the fixing holes in the mounting flanges are only
accessible when the access covers are open and hidden from sight when the covers
are closed.
If an MMLG test block is to be included, it is recommended that, when viewed from
the front, it is positioned on the right-hand side of the relay (or relays) with which it is
associated. This minimises the wiring between the relay and test block, and allows
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