Page 734 - 2018_IRC

SERVICES

intersystem bonding conductors shall be provided external E3609.4.1 Grounded service conductor. Equipment
to enclosures at the service equipment or metering equip- shall be bonded to the grounded service conductor in a
ment enclosure and at the disconnecting means for any manner provided in this code.
additional buildings or structures. An IBT shall comply E3609.4.2 Threaded connections. Equipment shall be
with all of the following: bonded by connections using threaded couplings or
1. It shall be accessible for connection and inspection. threaded hubs on enclosures. Such connections shall be
2. It shall consist of a set of terminals with the capacity made wrench tight.
for connection of not less than three intersystem E3609.4.3 Threadless couplings and connectors. Equip-
bonding conductors. ment shall be bonded by threadless couplings and connec-
tors for metal raceways and metal-clad cables. Such
3. It shall not interfere with opening of the enclosure
for a service, building or structure disconnecting couplings and connectors shall be made wrench tight.
means, or metering equipment. Standard locknuts or bushings shall not be used for the
bonding required by this section.
4. Where located at the service equipment, it shall be
securely mounted and electrically connected to an E3609.4.4 Other devices. Equipment shall be bonded by
enclosure for the service equipment, to the meter other listed devices, such as bonding-type locknuts, bush-
enclosure, or to an exposed nonflexible metallic ser- ings and bushings with bonding jumpers. [250.92(B)]
vice raceway, or shall be mounted at one of these E3609.5 Sizing supply-side bonding jumper and main
enclosures and connected to the enclosure or to the bonding jumper. The bonding jumper shall not be smaller
grounding electrode conductor with a 6 AWG or than the sizes shown in Table E3603.4 for grounding elec-
larger copper conductor. trode conductors. Where the service-entrance conductors are
5. Where located at the disconnecting means for a paralleled in two or more raceways or cables, and an individ-
building or structure, it shall be securely mounted ual supply-side bonding jumper is used for bonding these
and electrically connected to the metallic enclosure raceways or cables, the supply-side bonding jumper for each
for the building or structure disconnecting means, or raceway or cable shall be selected from Table E3603.4 based
shall be mounted at the disconnecting means and on the size of the ungrounded supply conductors in each race-
connected to the metallic enclosure or to the ground- way or cable. A single supply-side bonding jumper installed
ing electrode conductor with a 6 AWG or larger for bonding two or more raceways or cables shall be sized in
copper conductor. accordance with Table E3603.4 based on the largest set of
parallel ungrounded supply conductors. [250.102(C)]
6. It shall be listed as grounding and bonding equip-
ment. [250.94(A)] E3609.6 Metal water piping bonding. The metal water pip-
ing system shall be bonded to the service equipment enclo-
Exception: Means for connecting intersystem bonding sure, the grounded conductor at the service, the grounding
conductors are not required where communications electrode conductor where of sufficient size, or to the one or
systems are not likely to be used. more grounding electrodes used. The bonding jumper shall be
E3609.3.2 An aluminum or copper busbar not less than / 4 sized in accordance with Table E3603.4. The points of attach-
1
inch thick by 2 inches wide (6.4 mm by 51 mm) and of ment of the bonding jumper(s) shall be accessible.
sufficient length to accommodate not fewer than three ter- [250.104(A) and 250.104(A)(1)]
minations for communications systems in addition to other E3609.7 Bonding other metal piping. Where installed in or
connections shall be provided. The busbar shall be attached to a building or structure, metal piping systems,
securely fastened and shall be installed in an accessible including gas piping, capable of becoming energized shall be
location. Connections shall be made by a listed connector. bonded to the service equipment enclosure, the grounded
Where aluminum busbars are used, the installation shall conductor at the service, the grounding electrode conductor
comply with Section E3610.2. where of sufficient size, or to the one or more grounding elec-
Exception: Means for connecting intersystem bonding trodes used. The bonding conductor(s) or jumper(s) shall be
conductors are not required where communications sized in accordance with Table E3908.12 and equipment
systems are not likely to be used. grounding conductors shall be sized in accordance with Table
E3609.4 Method of bonding at the service. Bonding jump- E3908.12 using the rating of the circuit capable of energizing
ers meeting the requirements of this chapter shall be used the piping. The equipment grounding conductor for the cir-
around impaired connections, such as reducing washers or cuit that is capable of energizing the piping shall be permitted
oversized, concentric, or eccentric knockouts. Standard lock- to serve as the bonding means. The points of attachment of
nuts or bushings shall not be the only means for the bonding the bonding jumper(s) shall be accessible. [250.104(B)]
required by this section but shall be permitted to be installed
to make mechanical connections of raceways. Electrical con-
tinuity at service equipment, service raceways and service SECTION E3610
conductor enclosures shall be ensured by one or more of the GROUNDING ELECTRODE CONDUCTORS
methods specified in Sections E3609.4.1 through E3609.4.4. E3610.1 Continuous. The grounding electrode conductor
shall be installed in one continuous length without splices or
joints and shall run to any convenient grounding electrode

2018 INTERNATIONAL RESIDENTIAL CODE ® 709
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