UTILITY SERVICE ENTRANCE STANDARDS - NB Power

1 UTILITY SERVICEENTRANCESTANDARDSUTILITY SERVICE ENTRANCESTANDARDST able Of .. From The Standard .. Canadian Electrical Code .. With UTILITY Equipment .. For SERVICE .. Voltages .. Owned Transformers .. Balance .. Loads .. Capacity .. To Multiple Occupancy Buildings .. Entrances .. SERVICE Conductors .. SERVICE Equipment .. Electrical Code Rules Regarding ServiceEntrances ..20 Table Of Contents (cont'd) .. Specification For CustomerOwned Switchgear ..31 Figures:Fig. 1 SERVICE Mast Extending Through RoofFig. 2 SERVICE Point of Attachment on WallFig. 3 Pre-Wired, Single Phase, 120/240 Volt, 201 to600 Amp, Current Transformer ConnectedEnclosureFig. 4 Single Phase, 120/240 Volt, 201 to 600 Amp,Current Transformer ConnectedFig. 5 Three Phase, 120/208 or 347/600 Volt 201 to1200 AmpFig. 6 Current Transformer Connected May Pole,120/240V 400 AmpFig. 7 Self-Contained May Pole, 120/240V to 200 AmpFig. 8 Customer Owned Pole for Non-Fixed PremiseFig.

2 9 Temporary SERVICE ENTRANCE , Tripod MountedFig. 10 Outdoor MeteringFig. 11 UTILITY Metering Equipment - SummaryFig. 12 installation of Metering Current TransformersFig. 13 Municipal Festive LightingJune 20101 UTILITY SERVICE standard sets forth the minimum utilityrequirements for electrical SERVICE in the provinceof New Brunswick. It is not to be regarded as adesign specification and is not all inclusive withrespect to the installation of electrical equipmentor wiring. The requirements of this standard are in additionto the requirements of The Canadian ElectricalCode and the provincial electrical inspectionauthority, NB Safety Code services . Structure:A complex structure is any structure that wouldbe difficult to supply with a single serviceentrance due to its physical characteristics orelectrical requirements. The designation of astructure as complex must be mutually agreedupon by the Supply and Inspection :A Customer is defined as the owner, occupant, oran agent of the owner or occupant of a buildingor occupancy who deals with the SupplyAuthority regarding the SERVICE ENTRANCE to thebuilding or2 June 2010occupancy.

3 A Customer s agent may includeelectricians, contractors, consultants, engineers ortrustees of any s SERVICE Conductors:This term refers to Customer owned an overhead ENTRANCE these would typically bethe conductors in the SERVICE conduit from thepoint at which the Supply Authority makesconnection at the SERVICE head to the Customer sfirst SERVICE enclosure. On an undergroundentrance these would be the underground cablesfrom the utilities secondary system or transformerto the Customer s first SERVICE separation:Where occupancies of a building are separated by afirewall or a fire separation, the occupancies shallbe considered as separate buildings for the purposeof electrical SERVICE . Firewalls and fire separationsmust be constructed in compliance with theNational Building Code and confirmed as such inwriting by a recognized building inspector,architect, professional engineer or fire Premise:Non-fixed premise typically refers to a premisethat is not a permanently placed structure, such asa travel trailer or motor home.

4 See section SERVICE ENTRANCE 20103 SERVICE Box:An approved assembly consisting of a metal boxor cabinet constructed so that it may be locked orsealed, containing either SERVICE fuses and aservice switch or a circuit breaker, and of suchdesign that either the switch or circuit breakermay be manually operated when the box is Authority:The UTILITY having the authority to supplyelectrical energy. New Brunswick has four SupplyAuthorities, NB Power , Saint John Energy,Edmundston Energy and Perth Andover Approval:Written approval from the Supply Authorityauthorizing deviations from this standard. UtilityApproval must be obtained prior tocommencement of the work for which the UtilityApproval is being requested and the authorizeddeviation will apply only to the specificinstallation for which it was Supply Conductors:This term refers to the UTILITY owned overheadconductors connecting the Customer s serviceconductors to the UTILITY s secondary system ortransformer.

5 4 June FROM THE STANDARDW here provisions are made for deviations from thisstandard, UTILITY Approval shall be CANADIAN ELECTRICAL CODEI nterpretation of the Canadian Electrical Code in theprovince of New Brunswick is the responsibility of NBSafety Code UTILITY SERVICE ENTRANCE Standard containsreferences to the Canadian Electrical Code which areof interest to the Supply Authority. This documentdoes not, however, constitute a complete explanationof all CEC rules, which apply to SERVICE the code refers to compliance with therequirements of the local Supply Authority, the utilityshall be consulted for approval. Where compliance isnot met, the Supply Authority will request action bythe Inspection also section 15 - Canadian Electrical Code RulesRegarding SERVICE WITH UTILITY EQUIPMENTThe Supply Authority does not permit disconnectionor removal of meters, meter seals, UTILITY supplyconductors or any of its equipment.

6 Requests fordisconnection or removal of UTILITY equipment shall bemade to the UTILITY s regional FOR services ervice entrances will be connected uponcompliance with the following requirements:a)the Supply Authority has approved theservice ENTRANCE location, capacity andprovisions for metering equipment; andb)the installation has a signed valid wiringpermit issued by NB Safety Code services ; andc)the master sticker, or the sub , is affixed to the meter box(es); andd) the installation meets all other requirementsof the UTILITY SERVICE ENTRANCE ) For all entrances larger than 200A, theelectrical contractor must supply the Utilitywith a drawing showing the physical layout ofthe SERVICE ENTRANCE equipment includingmain disconnect, meter socket, instrumenttransformer cabinet, splitters, sub-metering, VOLTAGESAn electrical SERVICE should be designed such thatthe supply voltage is the voltage utilized by thelargest portion of the load.

7 The Customer shallsupply all transformation necessary to serve loadsutilizing voltages different from the frequency of all supply voltages is 60 Supply VoltagesContact the local supply authority for therequirements associated with SERVICE at Supply VoltagesNominal secondary supply voltages are:a)120/240 volt, single phase, three wire; orb)120/208 volt, three phase, four wire groundedwye; orc)347/600 volt, three phase, four wire groundedwye; ord)where UTILITY Approval is granted, 347/600 volt,three phase, four wire high resistance groundedwye. Where this configuration is approved andconforms to CEC rules 6-412 and 10-1100 to1108, the Customer shall provide the groundingresistor, all wiring, connectors, compartments,etc., associated with the high resistance Voltage Operating RangesThe normal and extreme operating ranges forsecondary supply voltages at the point of delivery areas follows:Nominal voltage - 120/240 VoltsNormal Range - 110/220 - 125/250 Extreme Range - 106/212 - 127/254 Nominal voltage - 120/208 VoltsNormal Range - 112/194 - 125/216 Extreme Range - 110/190 - 127/220 Nominal voltage - 347/600 VoltsNormal Range - 318/550 - 360/625 Extreme Range - 306/530 - 367/635 June 20107 Improvement of voltage levels beyond the normalrange but within the extreme range is done on aplanned basis.

8 Immediate corrective action shall betaken to correct voltage levels outside the OWNED TRANSFORMERSS izing of UTILITY owned transformers is theresponsibility of the UTILITY . Customers shall notrequest transformers of a specific BALANCES ervices shall be designed such that the ratedamperage and operating cycles of connected singlephase loads will result in equal current in all phases ofthe supply. Under nominal operating conditions theactual current in all phases of the supply shall bewithin 10 LOADSO perating large loads such as motors, electricfurnaces, electric welders, air conditioners, heatpumps, etc., can produce a momentary voltage sag or flicker . It is the responsibility of the Customer toensure that electric loads are switched on in such waythat sag or flicker is minimized. The operatingrequirements of large loads should be givenconsideration during design of the SERVICE EquipmentThe Customer is responsible for the installation ofsurge protection on sensitive electronic Sizes:a)The maximum motor sizes permitted for startingacross the line shall be:i)Single phase, horsepower; andii)Three phase 120/208 volt, 15 horsepower;andiii)Three phase 347/600 volt, 40 )Larger motors are permitted where:i)The Customer installs some type of reducedvoltage or variable frequency start.

9 Orii)Upon examination of the UTILITY s systemcapabilities and the motor s characteristics, UTILITY Approval for starting across the line Protection:The Customer shall be responsible to provide allmotor protection as per CEC rule overload protection will likely not provideadequate protection during loss of one supply of one phase of the UTILITY supply (or of thebuilding distribution system) will cause overheating anddamage to three phase motors. Therefore, protectionagainst the loss of one supply phase is recommendedand is the responsibility of the Heat Pumps:The Supply Authorities recommend heat pumps befitted with starting Phasea)The maximum single phase SERVICE entrancecapacity shall be 600 )Notwithstanding a), an 800 amp single phaseunderground SERVICE may be permitted withUtility Approval. [ UTILITY Approval Criteria -Three phase SERVICE is not readily availablefrom the UTILITY and the UTILITY s systemcapacity is adequate or, at the discretion ofthe UTILITY .]

10 ] Phasea)The maximum overhead three phase serviceentrance capacity shall be 600 )The maximum three phase SERVICE entrancecapacity shall be 2000 ) SERVICE ENTRANCE capacities greater than 2000amps shall have secondary bus ducts orparallel SERVICE conductors. SERVICE entrancesgreater than 2000 amps shall have a detailedengineering analysis prepared by a registeredprofessional engineer and submitted to theInspection )Before commencing any SERVICE entranceinstallation using bus duct, the Customer shallconsult with the Supply TO MULTIPLE OCCUPANCYBUILDINGSa)Multiple Occupancy Buildings include strip mallsor plazas, duplex, row and semi-detached housing,and other such )Where a non-residential multiple occupancybuilding qualifies as complex structure, refer tosection Rule 6-102 - Number Of SupplyServices )Where more than one set of UTILITY supplyconductors is run to a residential multipleoccupancy building:i)The services shall be run underground; andii)The occupancies shall be completely self-contained ( no indoor access betweenoccupancies); andiii)The occupancies shall not be located oneabove the other.