Bulletin 10-23-3 Grounding & Bonding In Farms Rules 10-210 .
Ontario Electrical Safety Code-BulletinsBulletin 10-23-3Grounding & bonding in farmsRules 10-210 d) and 10-700Issued May 2019Supersedes Bulletin 10-23-2Scope(1) Background(2) Equipotential bonding in milking areas(3) Grounding and bonding for farm buildings(a) Farm service(b) Central Metering System – grounding at individual buildings(c) Pole or pad mount Central Metering System – grounding at utility transformer(1) BackgroundThe Ontario Electrical Safety Code (OESC) provides Equipotential bonding requirements which may mitigatestray voltage effects in farms caused by the normal delivery and use of electricity. It should be noted thecustomer contribution to stray voltage can often be mitigated by design and preventative maintenance of theelectrical system. For more information, please see ESA Guideline Basic Troubleshooting of On Farm StrayVoltage.(2) Equipotential bonding in milking areasIssueRule 10-700 e) requires the conductive metal parts of structures that livestock access be made equipotentialwith the non-current carrying conductive parts of electrical equipment (Bonded together) , in some cases, thishas been found to be insufficient to mitigate the effects of stray voltage in milking areas of buildings housinglivestock. In addition to the minimum requirements of Rule 10-700 e), ESA recommends the following;(1) Livestock waterers, wire mesh, grates, metallic water pipes, stanchions, water bowls, vacuum lines, grainfeeders, gates, support posts, and other metals shall be bonded together by a separate stranded copperconductor not smaller than No. 6 AWG.(2) The metallic equipment bonded together as specified above shall be connected to the ground buss at thedistribution panel by a separate copper conductor not smaller than No. 6 AWG. See Diagram B1.(3) In milking parlours, concrete floors are recommended to have a No. 9 gauge wire mesh, dimensions 15 cm 15 cm (6 in 6 in), and bonding should comply with the above requirements. See Diagram B2. Electrical Safety AuthorityBulletin 10-23-3Page 1 of 7
Ontario Electrical Safety Code-BulletinsDiagram B1 – Equipotential bonding in milking areasBond to grainfeeder support(typical)Hot airoutletNo. 6 ground wire to terminateon ground buss in distributionequipmentBond No. 6 copper ground wire to No. 9 wiremesh, dimensions 15 x 15 cm (6 x 6 in), inconcrete floor Bond at 3 m (10 ft) intervalsBond No. 6 copper ground wirein pit to No. 6 ground wire onparlour floor at both ends andboth sidesBond all metal parts (includingstanchions, gates, drawbridges,and support posts)Grounding pointNotes:(1) Minimum size of ground wire shall be No. 6 copper.(2) Wire mesh shall be No. 9 gauge, dimensions 15 x 15 cm (6 x 6 in).(3) Wire mesh shall be bonded to ground wire at maximum intervals of 3 m (10 ft).(4) All steel posts, gate posts, support posts, feeder brackets, etc., shall be bonded to ground wire.(5) Angle iron grate supports for floor drains shall be bonded at both ends of parlour and both sides of grate.(6) Ground loop on floor of pit shall be connected to ground loop on floor parlour at both ends and both sides.(7) Grounding conductor size is given in American wire gauge.(8) For new and reconditioned existing parlours, wire mesh shall have concrete cover of 75 mm (3 in). Electrical Safety AuthorityBulletin 10-23-3Page 2 of 7
Ontario Electrical Safety Code-BulletinsDiagram B2- Wire mesh in concrete floorsStanchionFeederReturn alleyGrillPostFloor drainAir ductHot air grillWire mesh in concreteNotes:(1) All metal parts shall be bonded (including stanchion gates, drawbridges, and support posts).(2) No. 6 copper wire in parlour floor shall be bonded to No. 6 copper wire in pit at both ends and both sides.(3) No. 6 copper ground wire shall be bonded to No. 9 wire mesh, dimensions 15 x 15 cm (6 x 6 in), in concrete floor at 3 m (10 ft) intervals.(4) Angle iron grate supports for floor drains shall be bonded at both ends of parlour and both sides of grate.(5) See Detail 1. Electrical Safety AuthorityBulletin 10-23-3Page 3 of 7
Ontario Electrical Safety Code-BulletinsDetail 1Post or stanchionParlour floorNo. 6 copper ground wireWire mesh¼ in steel rod length to suitwelding to postWire mesh, ground wire and ¼ in steel rod shall all be welded toensure circuit continuity.¼ in round steel rod shall be welded to feeder - down to mesh.¼ in rod, mesh and No. 6 copper ground wire shall be weldedtogether, 2 per side. Electrical Safety AuthorityBulletin 10-23-3Page 4 of 7
Ontario Electrical Safety Code-Bulletins(3) Grounding & bonding for farm buildings(a) Farm serviceRule 10-210 d) prohibits a connection between a grounding conductor and the system neutral after theService Box. This means a bonding conductor must be installed with all feeders or branch circuits feedingany out building including buildings housing livestock when supplied from distribution equipment. (SeeDiagram B3)Diagram B3 – Grounding & Bonding of Building supplied from Distribution Equipment(Farm Service)No SystemBondingJumperPermittedFeeder withbond conductorTransformerSupplyconductorsMeterFeeder withbond conductorService Box withSystem BondingJumper Electrical Safety AuthorityBulletin 10-23-3No SystemBondingJumperPermittedPage 5 of 7
Ontario Electrical Safety Code-Bulletins(b) Central metering system – grounding at individual buildingsThe feeders from a Pole or Pad Mount Central Metering System (CMS) supplying buildings are consideredConsumer’s Services. Rules 6-200 requires each building supplied by a Consumer’s Service to have a ServiceBox. Rule 10-210 requires a System Bonding Jumper at the Consumer’s Service (See Diagram B4).Note – More than one Consumer’s Service connected to a single building will result in objectionable currentover grounding and bonding conductors which is not permitted per Rules 10-100 and 10-500 (Objection currentover grounding and bonding conductors) connection in accordance with the requirements of topic (c) below willmitigate stray currents.Diagram B4 –CMS – grounding at individual buildingsBuilding 1Service Boxwith systembondingjumperConsumer sServiceConductorswithout a bondService Boxwith (c) Pole or pad mount Central metering system – grounding at utilitytransformerResearch has shown that sometimes single point groundings may be effective in mitigating some stray voltageissues and designers may wish to utilize this option for a CMS however it is not permitted by the OESC.Notwithstanding rule 10-210, for buildings on farms supplied by a CMS it shall be permitted to eliminate theSystem Bonding Jumper from the Service Boxes when the LDC permits connection of a bonding conductor runwith the Consumer’s Service conductors to their transformer. (See Diagram B5) Electrical Safety AuthorityBulletin 10-23-3Page 6 of 7
Ontario Electrical Safety Code-BulletinsDiagram B5 –CMS - with separate bonding conductorsSystemBondingJumperRemovedFeeder withbond conductorSupplyConductors MeteringCTMeterFeeder withbond conductorLDC Agreementto terminatebond conductorto e overhead conductors are used to distribute 3-wire 120/240 V feeders, acceptable methods ofinstallations for the conductors feeding a building include: Quadruplex Type NS75, with the bare conductor utilized as the bonding conductor. The neutralconductor is required to be insulated, and properly identified as per Rule 4-030; Triplex Type NS75, with the bare conductor utilized as the bonding conductor and a white neutralconductor lashed over the triplex conductors; or Triplex Type NS75, with the bare conductor utilized as the neutral conductor (not in contacted withbonded metal as per Rule 12-318) and a green conductor lashed over the triplex conductors. Electrical Safety AuthorityBulletin 10-23-3Page 7 of 7
Electrical Safety Authority Bulletin 10-23-3 Page 1 of 7 Bulletin 10-23-3 Grounding & bonding in farms Rules 10-210 d) and 10-700 Issued May 2019 Supersedes Bulletin 10-23-2 Scope (1) Background (2) Equipotential bonding in milking areas (3)
Grounding Study and Analysis: Substation Grounding Practices Grounding Concepts - GPR and Touch Potential AEP Innovative Grounding Study Methods Grounding Installation: Traditional Approach and Challenges Grounding Application and Installation Change Management Testing: Grounding Integrity Testing Conclusion and .
Grounding Electrode System and Grounding Electrode Conductor Part III zNEC 250.50 (Grounding Electrode System) 250.52 Electrodes Water Pipe if 10 ft. or more of metal water pipe is in contact with the earth. Metal Frame of the Building or Structure where the followin
Article 250.1 Scope. Article 250 is organized into 10 different parts that deal with specific requirements with regards to bonding and grounding. The specific parts are as follows: (I) General (II) System Grounding (III) Grounding Electrode System and Grounding electrode Conductor (IV) En
NEC Table 250.122 - Minimum size equipment grounding conductors for grounding raceway and equipment Table 2 – Minimum size equipment grounding conductors for grounding raceway and equipment Aluminum Cable Tray Systems Table 392.60(A) – Metal area requiremen
grounding bar in the service equipment. The grounding electrode conductor shall extend to a grounding electrode (a ground rod or other effective electrode). 6.2.3 An equipment grounding conductor shall originate at this service equipment and shall be installed with the circuit conductors to the waterer. 6.2.4 The equipment grounding conductor .
buried depth of the grounding grid, the resistance reducing effect is not obvious, in particular to areas with high soil resistivity. Therefore, in general, this method is not adopted in the engineering. The buried depth of the substation grounding grid is about 0.8 m generally. Long vertical grounding electrodes, blasting grounding and deep well
the point of grounding for the time necessary to clear the line. NOTE: Refer to ASTM F-855-04 [B24] for specifications for protective grounding equipment. 2. Initial connections Before grounding any previously energized part, the employee shall first securely connect one end of the grounding device to an effective ground.
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