Rate Schedule
SCHEDULE P
POWER FACTOR PROVISIONS
12.06.310
APPLICATION:
The provisions of this schedule shall be applicable
to all electrical service, unless and until specific arrangements are
made in writing with Tacoma Power to the contrary.
EQUIPMENT:
Except for portable equipment of less time than three kVA rating and arc
furnace loads as set forth in Adjustment Provision (2) below, all
installations of neon, mercury vapor, fluorescent or other gaseous tube
lighting, as well as welding transformers, X-ray machines, motors and
any other electrical equipment having low power factor characteristics,
which are hereafter installed, replaced, relocated or rearranged, shall
include proper equipment to correct the power factor of such
installations to not less than 95 percent lagging for each unit or
separately controlled group of units, or 90 percent lagging for each
separate service whose load primarily consists of an arc furnace(s).
Existing nonconforming electrical installations shall be subject to all
provisions of this chapter and the installation of corrective equipment
may be required by Tacoma Power.
All
power factor corrective equipment installed or operated by the customer
shall be so used as to further the objectives of this chapter without
causing adverse voltage conditions upon Tacoma Power's system. Tacoma
Power shall have the right to require the installation of suitable
switching facilities and to disconnect or to refuse to furnish electric
energy to any installation that, in the opinion of Tacoma Power, is
detrimental to the rendering of satisfactory service to its other
customers.
ADJUSTMENT PROVISIONS:
If
the average power factor at which electric energy is delivered to the
customer during the billing period is 95 percent or more, no adjustment
will be made in the customer's billing for that period, unless otherwise
provided in written contract.
If
such average power factor is less than 95 percent, the customer's
billing shall be adjusted as follows:
-
For demand type rate schedules which serve other than arc furnace
loads, the measured demand in kilowatts shall be adjusted by
multiplying by 0.95 and dividing the result by the average power
factor. Such adjusted demands shall then become and thereafter be
used as a basis for billing.
-
For demand type rate schedules which serve arc furnace loads,
the measured demand in kilowatts shall be adjusted by multiplying by
0.90 and dividing the result by the average power factor. Such
adjusted demands shall then become and thereafter be used as a basis
for billing.
-
Minimum charges shall be determined on the basis of 1 or 2 above, as
applicable.
-
For loads up to 75 kilowatts connected, Tacoma Power may elect not
to apply the adjustment provisions herein established.
MINIMUM AND AVERAGE POWER FACTOR:
Unless otherwise specifically agreed, Tacoma Power shall not be
obligated to deliver electrical energy to the customer at any time at a
power factor below 80 percent lagging.
The
Average Power Factor (APF) is determined as follows:
-
As determined with a watt-hour meter and a var-hour meter:
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|
Kilowatt-hours |
| APF |
= |
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| |
|
√(Kilowatt-hours)²
+ (Reactive Kilovolt Ampere-hours)² |
The
var-hour meters for measurement of reactive power shall be ratcheted to
prevent reverse registration.
SERVICE CONDITIONS:
Applicable provisions of the City code, General Provisions, and Customer
Service Policies governing the sale of electric energy shall apply.
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