Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-46B - Electrical safety standards, administration, and installation › Part A - NEC INSTALLATION AMENDMENTS, STANDARDS, INSPECTIONS, AND DEFINITIONS › Section 296-46B-230 - Services

Current through Register Vol. 24-14, July 15, 2024
001 General service requirements.
(1) The owner, the owner's agent, or the
				electrical contractor making the installation must consult the serving utility
				regarding the utility's service entrance requirements for equipment location
				and meter equipment requirements before installing the service and equipment.
				Provisions for a meter and related equipment, an attachment of a service drop,
				or an underground service lateral must be made at a location acceptable to the
				serving utility. The point of contact for a service drop must permit the
				clearances required by the NEC.
(2)
				A firewall must have a minimum two-hour rating as defined by the local building
				official to be considered a building separation in accordance with Article 100
				NEC.
(3) The height of the center
				of the service meter must be as required by the serving utility. Secondary
				instrument transformer metering conductor(s) are not permitted in the service
				raceway.
028 Service or other masts.
(4) Conduit extended through the roof to
				provide means of attaching:
(a) All overhead
				drops for service, feeder, or branch circuits exceeding #1 AWG aluminum or #3
				AWG copper must be rigid steel galvanized conduit no smaller than two
				inches.
(b) All overhead drops for
				service, feeder or branch circuits not exceeding #1 AWG aluminum or #3 AWG
				copper must be rigid steel galvanized conduit no smaller than 1 1/4 inches. The
				installation must comply with drawings E-101 and/or E-102, or must provide
				equivalent strength by other approved means. Masts for altered or relocated
				installations will be permitted to comply with drawing E-103.
Click here to view
				  image
Click here to view
				  image
Click here to view
				  image
Notes to drawings E-101, E-102, and E-103
(1) An approved roof flashing must be
				installed on each mast where it passes through a roof. Plastic, nonhardening
				mastic must be placed between lead-type flashings and the conduit. Neoprene
				type flashings will also be permitted to be used.
(2) Masts must be braced, secured, and
				supported in such a manner that no pressure from the attached conductors will
				be exerted on a roof flashing, meter base, or other enclosures.
(3) Utilization of couplings for a mast is
				permitted only below the point the mast is braced, secured, or supported. There
				must be a minimum of two means of support above any couplings used. A properly
				installed cable or stiff leg type support qualifies as one of the two required
				means of support.
(4) Except as
				otherwise required by the serving utility, service mast support guys must be
				installed if the service drop attaches to the mast more than 24 inches above
				the roof line or if the service drop is greater than 100 feet in length from
				the pole or support. Masts for support of other than service drops must comply
				with this requirement as well.
(5)
				Intermediate support masts must be installed in an approved manner with methods
				identical or equal to those required for service masts.
(6) For altered services, where it is
				impractical to install U bolt mast supports due to interior walls remaining
				closed, it will be permissible to use other alternate mast support methods such
				as heavy gauge, galvanized, electrical channel material that is secured to two
				or more wooden studs with 5/16 inch diameter or larger galvanized lag bolts.
				(7) Conductors must extend at least 18 inches from all mastheads to permit
				connection to the connecting overhead wiring.