HANDBOOK REQUIREMENTS - Central Maine Power Company

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• The compartment shall be isolated by barriers; and,
metered and unmetered busses shall be separated by
barriers.
• Bus arrangements for low voltage (below 600) shall
accommodate 12 inch long CT bars (multiple bars
are
¼” x 3” x 12”).
• Units with voltage above 300 (phase-to-phase),
shall
have
provisions for mounting VTs.
• Any removable
or hinged covers over unmetered busses
or connections shall have sealing provisions or approved
tamper-proof fasteners.
Upo n installation of the switchgear, any existing removable
CT links/supports must be removed. For all switchgear
or
transclosure installations, it shall be the responsibility of the
customer
to install instrument transformers and make primary
connections.
For an installation where the neutral conductor does not
pass through
the instrument transformer compartment, an
insulated stranded copper neutral conductor,
not smaller than #12
AWG, shall be brought into and connected to an insulated
terminal in the instrument transformer compartment.
A 1 1/4 inch minimum metallic conduit, furnished and
installed by the customer, shall be run continuous from the meter
enclosure to the instrument transformer
compartment. This
conduit shall be either rigid metal conduit (RMC) or intermediate
metal conduit (IMC) and be properly bonded
to provide an
effecti ve ground-fault
current path (per Section VII of this
handbook and
NEC Article 250). Note: the metering
cable/conduit
shall not pass thru any other vertical
sections/compartments
of the switchgear.