South Carolina Code of Regulations › Chapter 103 - PUBLIC SERVICE COMMISSION › Article 3 - ELECTRIC SYSTEMS › Subarticle 5 - ENGINEERING › Section 103-363 - Adequacy of Service

Current through Register Vol. 48, No. 6, June 28, 2024
1. Operation of
				Electrical Utility.
A. Standard
				Frequency--Each electrical utility supplying alternating current shall adopt a
				standard frequency of 60 Hertz, suitability of which has been determined by the
				commission, and shall maintain this frequency within 15 seconds plus or minus
				of standard at all times during which service is supplied; provided, however,
				that momentary variations of frequency of more than fifteen seconds which are
				clearly due to no lack of proper equipment or reasonable care on the part of
				the electrical utility, shall not be construed a violation of this
				rule.
B. Standard Voltage--Each
				electrical utility shall adopt standard average voltage for its different
				classes of constant voltage service. This voltage maintained at the electrical
				utility mains shall at all times be reasonably constant, and the variations in
				voltage from the average shall in no case exceed the limitations as prescribed
				below.
The voltage variations for service should not exceed 10%
				  above or below the standard average voltage.
A greater variation of voltage than specified above may be
				  allowed when service is supplied directly from the transmission line or in a
				  limited or extended area where customers are widely scattered, and the business
				  done does not justify close voltage regulation. In such cases, the best voltage
				  regulation should be provided that is practicable under the
				  circumstances.
Variations in the voltage in excess of those specified,
				  caused by the operation of power apparatus on customers' premises which
				  necessarily requires large starting current by the action of the elements, and
				  by infrequent and unavoidable fluctuations of short duration due to station
				  operation, shall not be construed a violation of this rule.
C. Special Equipment--Where a separate
				transformer or other additional electrical utility standard equipment or
				capacity is to be used to eliminate fluctuations or other effects detrimental
				to the quality of service to other customers the electrical utility may make a
				reasonable charge for the transformer, equipment and line capacity required. In
				lieu of the above, the electrical utility may require the customer to either
				discontinue the operation of the equipment causing the disturbance or install
				the necessary motor generator set or other apparatus to eliminate the
				disturbance detrimental to the service of other customers.
D. When only one set of overhead service
				wires (service drop) is required to connect a residential or small
				non-residential customers to electric service mains, the electrical utility
				shall provide such service drop including the attachments at the point where
				service drop wires are attached to customer's premises, which point shall be
				the point nearest the electrical utility's electric circuit to be used in
				supplying service to the customer. The customer shall provide "service entrance
				facilities" including meter loop, entrance switch or circuit breaker, and
				service entrance conductors complying with rules of the electrical utility from
				the point of attachment of the electrical utility's service drop on the
				customer's premises. The customer shall provide a substantial point of
				attachment for service drop wires. This provision does not apply to large
				non-residential or industrial customers' connections as they vary so greatly
				that each requires special consideration. When service to the customer requires
				individual electrical utility company facilities (such as oil circuit breakers,
				transformers, etc.), to be located on customer's premises on the ground or in a
				vault, the customer shall provide a suitable, adequate and readily accessible
				space for such facilities and shall insure access at all times. Electrical
				utility property installed on a customer's premises shall remain property of
				the electrical utility and may be removed for testing, repairs, changes in
				service or other conditions justifying change or removal.
E. For substations erected to serve an
				individual customer, the electrical utility shall provide either suitable
				supports on the substation structure or a suitable structure outside and
				immediately adjacent to its substation property line to which the customer
				shall extend his facilities. The customer in addition shall install, or cause
				to be installed, all facilities beyond the point of delivery thus established.
				When required by the electrical utility, the customer shall install one set of
				main disconnecting switches which shall control all of the customer's load
				other than a fire pump circuit, if any.
F. The meter installation of the electrical
				utility may include enclosures that may be locked by the electrical utility and
				not accessible to the customer.