HANDBOOK REQUIREMENTS - Central Maine Power Company

B. CURRENT AND VOLTAGE TRANSFORMERS
(CTs & VTs)
Installations (except for "self-contained", paragraph
809) where the voltage of the incoming line is greater than
150 volts to ground (on a grounded line) or greater than
300 volts between
conductors (on an ungrounded line) shall
generally be arranged for metering with both CTs and VTs.
NOTE: With prior Company approval, 277/480 volt,
greater than 200 amp, four-wire wye services may be
arranged
for CTs only (no VTs) metering.
Customers will not be allowed to connect any
equipment to the metering terminals of instrument
transformers.
C. METER MOUNTING DEVICES (TRANSFORMER-
RATED)
The customer shall supply and install all meter
mounting devices as required. Refer to the "Supplement"
for meter mounting equipment requirements and options
(see inside back cover of this handbook). All transformerrated
meter mounting devices shall have provisions for
mounting a test switch.
Meter mounting devices shall be properly bonded and
grounded, by the customer, in accordance with Section VII,
“Grounding” and NEC Article 250. This generally requires
connection to a grounding electrode with
a grounding
electrode conductor no smaller than No. 4, stranded copper.
Additionally, there must be appropriate bonding to provide
an effective ground-fault current path to the (voltage)
source neutral. See Illustration No. 14, 15, 16 or 17 in
Section XII for further details.
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