INFORMATION & REQUIREMENTS ELECTRIC SERVICE - NStar

ARTICLE 606-607 ARTICLE 608-701
as amended. Section 1312.2 Power Factor: Utilization
equipment greater than 1,000 watts and lighting equipment
greater than 15 watts with an inductive reactive load
component shall have a power factor of not less than 85
percent under rated load conditions. Power factor of less than
85 percent shall be corrected to at least 90 percent under rated
load conditions. Power factor corrective devices, installed to
comply with this code, shall be switched with the utilization
equipment, except where this results in an unsafe condition or
interferes with the intended operation of the equipment.
606. Power Factor Correction Capacitors
When the customer desires to install capacitors for the
purpose of power factor correction, the capacitors must be
installed to prohibit inadvertent reverse current flow at low
loads to NSTAR’s system.They must also be sized and installed
in such a manner as not to create harmonic interference on
NSTAR’s lines.The NSTAR New Customer Connect Tech
Center must be contacted prior to the ordering and installation
of such equipment. NSTAR will de-energize any service that
creates voltage distortion or inadvertent current flow to its
system.
607. Power Supply to Voltage Sensitive Equipment
Customers who install computers, X-ray equipment,
emergency devices or other voltage sensitive equipment are
advised that auxiliary devices and relays must be employed to
filter out voltage spikes and to adjust for voltage variations.
NSTAR is not responsible for voltage variations that may be
caused by switching, lightning surges, motor vehicles hitting
utility poles or by other conditions beyond NSTAR’s control.
608. Power Quality
NSTAR delivers high quality power.The increased use of
customer-owned equipment that can adversely affect the
quality of electric service to other customers is of great
concern. In order to maintain delivery of high quality power to
all of our customers, the installation of customer-owned
equipment that may affect NSTAR’s electric system, shall meet
NSTAR specifications. NSTAR reserves the right to withhold
or disconnect service where installation of such loads or
equipment is detrimental to NSTAR’s service to other
customers. For further information please contact the NSTAR
New Customer Connect Tech Center.
NSTAR has adopted IEEE Std. 519-1992, IEEE Recommended
Practices and Requirements for Harmonic Control in Electric
Power Systems. However, NSTAR reserves the right to enforce
stricter guidelines than those outlined in IEEE 519-1992, when
in NSTAR’s opinion, the harmonic contributions from a
customer or group of customers contributes to a degradation
in the quality of service to other customers on the system to an
unacceptable level. NSTAR may require corrective actions be
taken at the customer’s expense.
ARTICLE 700 METERS & GENERAL REQUIREMENTS
701. General
All energy supplied by NSTAR shall, in general, be measured
by appropriate meters for billing purposes. The installation of
meters and metering equipment shall comply with the
requirements set forth in this Article.
Meters will be provided, maintained, installed, moved, and
removed only by authorized NSTAR employees. No changes in
metering equipment of any nature whatsoever are to be
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