§ 15.32.040. Wiring standards.

A.

1.

On a service entrance where a conduit is used for the point of attachment of the service drop, that conduit shall be two inches or greater in size, and shall be rigid galvanized conduit.

2.

Main Disconnect. There shall be a main disconnect switch or circuit breaker at the point of entrance on the exterior of all buildings or structures. It is permissible to use the six turn-off rule per N.E.C. on exterior of buildings or structures.

3.

Commercial Services Over 400 Amps. On commercial structures the main service disconnect over four hundred amps shall be allowed to be installed to the installation requirements of Article 230 Services. The disconnecting means shall be a shunt trip breaker actuated by a Knox Key switch installed in a weather proof box. The location of the Knox Key switch shall be approved by the building inspector. The Knox Key switch box shall be labeled, "MAIN ELECTRICAL DISCONNECT SHUNT TRIP." The service entrance conductors shall be underground and shall terminate directly into the MDP.

B.

All service equipment shall be grounded with a driven copper bonded rod as follows:

Size of Grounding Conductor AWG	Copper Bonded Ground Rod
	No. of Rods	Size of Rods
#8	1	½″ × 8′
#6	1	½″ × 8′
#4	1	5/8 ″ × 8′
#2	2	½″ × 8′ or
	1	¾″ × 8′
#1/0	2	½″ × 8′ or
	1	¾″ × 8′
#2/0	2	5/8 ″ × 8′ or
	1	½″ × 8′ and
	2	5/8 ″ × 8′
#3/0	2	5/8 ″ × 8′ or
	2	½″ × 8′

 

Note: Size of grounding conductor shall be taken from Table 250.66 of the 2005 National Electrical Code.

C.

In new installations or remodeling no BX or knob and tube wiring shall be installed and no new outlets shall be added to existing BX or knob and tube wiring.

D.

Number 8 aluminum wiring or smaller shall not be installed in any type of installation.

E.

All commercial buildings in the city shall be wired in conduit. Low voltage of twenty-five volts of less is to be excluded from this section, but must comply with current adopted electrical code.

(Ord. 4173 § 1 (part), 2007)