Engineering notes on transformers, switchgear, energy storage and EV charging for North-American projects — lead times, sizing, codes and supply chain.https://entogo.ca/enEntogo Inc.https://entogo.ca/insights/choosing-a-facility-distribution-voltage/https://entogo.ca/insights/choosing-a-facility-distribution-voltage/North American facilities are served at 120/208, 277/480, or 347/600 volts. A higher voltage moves the same power at lower current, cutting conductor size and losses while adding transformer and safety cost. Here is how to match the voltage to the load.Sun, 23 Aug 2026 00:00:00 GMTPower & DistributionPower & DistributionTransformersSwitchgearFacility DesignANSI C84.1https://entogo.ca/insights/transformer-voltage-regulation-tap-changers/https://entogo.ca/insights/transformer-voltage-regulation-tap-changers/A transformer needs voltage regulation when source voltage swings beyond about 5 percent or loads are voltage-sensitive. Fixed de-energized taps correct a standing offset; on-load tap changers hold output steady continuously. Here is how to choose and specify.Fri, 21 Aug 2026 00:00:00 GMTPower & DistributionTransformersVoltage RegulationTap ChangersPower & DistributionSubstationshttps://entogo.ca/insights/transformer-impedance-percent-z-selection/https://entogo.ca/insights/transformer-impedance-percent-z-selection/Transformer percent impedance (%Z) sets how much fault current the secondary can deliver and how far voltage sags under load. Lower %Z means higher available fault current and better regulation; higher %Z limits fault duty but drops more voltage. Here is how to choose it and what to specify.Wed, 19 Aug 2026 00:00:00 GMTPower & DistributionTransformersPower & DistributionFault CurrentShort-Circuit RatingVoltage Regulationhttps://entogo.ca/insights/power-system-grounding-scheme-selection/https://entogo.ca/insights/power-system-grounding-scheme-selection/Most North American facilities are solidly grounded, but resistance grounding can keep a plant running through a first ground fault. How to choose among solidly grounded, high-resistance grounded, and ungrounded systems, and what each requires under the NEC and IEEE 142.Mon, 17 Aug 2026 00:00:00 GMTPower & Distributionpower distributionswitchgeartransformersgroundingstandardshttps://entogo.ca/insights/do-you-need-a-k-rated-transformer/https://entogo.ca/insights/do-you-need-a-k-rated-transformer/A K-rated transformer is built to carry the harmonic currents that nonlinear loads draw without overheating. When switch-mode power supplies, drives, and LED lighting dominate a panel, the transformer's K-rating and an oversized neutral decide whether a standard unit will survive the load.Sat, 15 Aug 2026 00:00:00 GMTPower & DistributionTransformersHarmonicsPower QualityNonlinear LoadsData Centershttps://entogo.ca/insights/dc-coupled-vs-ac-coupled-solar-storage/https://entogo.ca/insights/dc-coupled-vs-ac-coupled-solar-storage/DC coupling ties the battery to the array's DC bus behind one hybrid inverter and recaptures clipped energy; AC coupling gives solar and storage their own inverters and easier retrofits. The right choice depends on whether the two are built together.Thu, 13 Aug 2026 00:00:00 GMTSolar-Storage-Chargingsolar-plus-storageenergy storagebattery storageinvertersrenewable grid connectionDC couplinghttps://entogo.ca/insights/medium-voltage-service-primary-metering/https://entogo.ca/insights/medium-voltage-service-primary-metering/Taking medium-voltage utility service means owning the step-down transformer and the substation behind it, in exchange for a lower primary-metering rate. It pays off for large, steady loads but shifts transformer losses, maintenance, and protection to the buyer. Here is how to weigh the trade-off.Tue, 11 Aug 2026 00:00:00 GMTPower & DistributionSubstationsPower DistributionMedium VoltageSwitchgearTransformershttps://entogo.ca/insights/nema-vs-ip-enclosure-ratings-outdoor-power-equipment/https://entogo.ca/insights/nema-vs-ip-enclosure-ratings-outdoor-power-equipment/NEMA enclosure types and IEC 60529 IP codes both rate ingress protection, but they are not interchangeable — NEMA 250 also tests corrosion, icing and hosedown, which the IP code omits. For North American power equipment, specify a NEMA type and treat IP as a supplement.Sun, 09 Aug 2026 00:00:00 GMTPower & DistributionEnclosuresNEMAIP RatingSwitchgearSubstationsStandardshttps://entogo.ca/insights/grid-forming-vs-grid-following-inverters-battery-storage/https://entogo.ca/insights/grid-forming-vs-grid-following-inverters-battery-storage/Grid-following inverters follow an existing grid voltage, while grid-forming inverters set their own voltage and frequency so they can ride through weak grids, island, and black-start. Here is how to tell which one a battery storage project needs and what to specify.Wed, 05 Aug 2026 00:00:00 GMTEnergy StorageBattery Energy StorageGrid-Forming InvertersGrid InterconnectionIEEE 2800Microgridshttps://entogo.ca/insights/total-owning-cost-transformer-loss-evaluation/https://entogo.ca/insights/total-owning-cost-transformer-loss-evaluation/The cheapest transformer is rarely the least expensive to own. Total owning cost adds the capitalized value of no-load and load losses to the purchase price, so two units that meet the same DOE efficiency floor can differ by thousands over their service life.Mon, 03 Aug 2026 00:00:00 GMTPower & DistributionTransformersPower & DistributionEnergy EfficiencyProcurementTotal Cost of Ownershiphttps://entogo.ca/insights/gas-insulated-vs-air-insulated-switchgear/https://entogo.ca/insights/gas-insulated-vs-air-insulated-switchgear/Gas-insulated switchgear seals live parts in gas for a compact, low-maintenance lineup; air-insulated switchgear stays larger but fully serviceable and gas-free. The right choice turns on footprint, environment, voltage class, and tightening SF6 rules.Sat, 01 Aug 2026 00:00:00 GMTPower & Distributionswitchgeargas-insulated switchgearpower distributionsubstationsSF6https://entogo.ca/insights/lfp-vs-nmc-batteries-stationary-storage/https://entogo.ca/insights/lfp-vs-nmc-batteries-stationary-storage/LFP and NMC are the two lithium-ion chemistries behind most stationary storage. LFP leads on cycle life, thermal stability and cost per kWh; NMC packs more energy into less space. Here is how to match chemistry to a project.Fri, 31 Jul 2026 00:00:00 GMTEnergy StorageEnergy StorageBESSBattery ChemistryLFPNMChttps://entogo.ca/insights/switchboard-vs-switchgear-ul-891-vs-ul-1558/https://entogo.ca/insights/switchboard-vs-switchgear-ul-891-vs-ul-1558/Switchboards and low-voltage switchgear both distribute power below 1000 V, but they are built and tested to different standards. Switchgear (UL 1558) uses draw-out breakers and a short-time withstand rating that supports coordination; switchboards (UL 891) are simpler and more economical for less demanding loads.Wed, 29 Jul 2026 00:00:00 GMTPower & DistributionSwitchgearSwitchboardsPower & DistributionStandardsElectrical Designhttps://entogo.ca/insights/selective-coordination-nec-requirements/https://entogo.ca/insights/selective-coordination-nec-requirements/Selective coordination means the overcurrent device nearest a fault opens first, so one short circuit does not cascade into a wider outage. The NEC requires it for emergency, standby, and other critical loads, verified with a time-current-curve study.Tue, 21 Jul 2026 00:00:00 GMTPower & DistributionSelective coordinationOvercurrent protectionSwitchgearNECPower distributionhttps://entogo.ca/insights/air-cooled-vs-liquid-cooled-battery-storage/https://entogo.ca/insights/air-cooled-vs-liquid-cooled-battery-storage/Battery cells age faster when they run hot, so a BESS cooling architecture largely decides its lifespan and footprint. Air cooling is simpler and cheaper; liquid cooling holds tighter temperatures for dense, high-throughput sites. Here is how to choose.Sun, 19 Jul 2026 00:00:00 GMTEnergy StorageEnergy StorageBESSThermal ManagementBattery StorageCommercial & Industrialhttps://entogo.ca/insights/when-does-a-commercial-microgrid-make-sense/https://entogo.ca/insights/when-does-a-commercial-microgrid-make-sense/A microgrid lets a site keep critical loads running through an outage by islanding onto local storage and generation. It makes sense where outage cost is high or grid capacity is constrained, and it requires grid-forming inverters, a microgrid controller, and utility-approved protection.Fri, 17 Jul 2026 00:00:00 GMTMicrogridsMicrogridsEnergy StorageRenewable Grid ConnectionResilienceCommercial & Industrialhttps://entogo.ca/insights/available-fault-current-sccr-what-to-specify/https://entogo.ca/insights/available-fault-current-sccr-what-to-specify/Available fault current is the maximum current a bolted short circuit can push through a system at a point. Every breaker, switchboard, and control panel needs a short-circuit current rating at least equal to it, and non-dwelling service equipment must be field-marked with the value under NEC 110.24.Wed, 15 Jul 2026 00:00:00 GMTPower & DistributionAvailable Fault CurrentShort-Circuit Current RatingSwitchgearNECPower & DistributionStandards & Compliancehttps://entogo.ca/insights/harmonic-distortion-ieee-519-limits/https://entogo.ca/insights/harmonic-distortion-ieee-519-limits/Harmonic distortion from VFDs, EV chargers, and data-center power supplies can breach IEEE 519 limits and quietly overheat neutrals, transformers, and switchgear. This guide explains the 519-2022 voltage and current limits and how to specify mitigation before it becomes a field problem.Mon, 13 Jul 2026 00:00:00 GMTPower QualityPower QualityHarmonicsIEEE 519VFDData CentersPower & Distributionhttps://entogo.ca/insights/how-to-size-a-battery-energy-storage-system-power-vs-energy/https://entogo.ca/insights/how-to-size-a-battery-energy-storage-system-power-vs-energy/A battery energy storage system is sized with two independent numbers, power in megawatts and energy in megawatt-hours. Their ratio is the C-rate, which fixes how long the system runs at full output and drives cost, cooling, and site design.Sat, 11 Jul 2026 00:00:00 GMTEnergy StorageEnergy StorageBattery StorageBESSSystem SizingGrid Connectionhttps://entogo.ca/insights/ev-charging-load-management-service-upgrade/https://entogo.ca/insights/ev-charging-load-management-service-upgrade/Adding EV chargers often does not require a larger electrical service. NEC 625.42 lets an energy management system cap the combined draw, so a site can be sized to the managed load instead of the full nameplate of every charger. Here is how to decide and what to specify.Thu, 09 Jul 2026 00:00:00 GMTEV ChargingEV ChargingLoad ManagementEVEMSNEC 625Site PowerElectrical Servicehttps://entogo.ca/insights/ieee-1547-der-grid-interconnection/https://entogo.ca/insights/ieee-1547-der-grid-interconnection/Connecting solar or battery storage to the North American grid means meeting IEEE 1547-2018 for DER behavior, using a UL 1741 SB certified inverter, and passing a utility interconnection review that scales from a fast-track screen to a full study. Here is how the pieces fit.Tue, 07 Jul 2026 00:00:00 GMTRenewable Grid ConnectionRenewable Grid ConnectionEnergy StorageIEEE 1547InterconnectionStandards & Compliancehttps://entogo.ca/insights/arc-resistant-switchgear-ieee-c37-20-7-rating/https://entogo.ca/insights/arc-resistant-switchgear-ieee-c37-20-7-rating/Arc-resistant switchgear redirects the pressure and heat of an internal arcing fault away from anyone standing nearby, tested to IEEE C37.20.7. It is specified where crews work close to energized medium-voltage gear and calculated incident energy is high.Sun, 05 Jul 2026 00:00:00 GMTPower & DistributionSwitchgearArc Flash SafetyPower & DistributionStandards & ComplianceData Centershttps://entogo.ca/insights/transformer-efficiency-standards-doe-10-cfr-431/https://entogo.ca/insights/transformer-efficiency-standards-doe-10-cfr-431/US distribution transformers must meet DOE 10 CFR 431 minimum efficiency, defined at 35 percent load for dry-type units and 50 percent for liquid-immersed. A 2024 final rule raises those floors for units built on or after April 23, 2029, and here is how the rules work and what to specify.Fri, 03 Jul 2026 00:00:00 GMTStandards & ComplianceTransformersEfficiencyStandards & ComplianceDOE 10 CFR 431Power & Distributionhttps://entogo.ca/insights/power-factor-correction-utility-penalty/https://entogo.ca/insights/power-factor-correction-utility-penalty/Utilities such as BC Hydro and Hydro One surcharge or re-bill on kVA when power factor falls below 90 percent. Capacitor banks raise power factor to clear the penalty, but harmonics can drive resonance, so IEEE 519 and detuned designs govern a safe install.Wed, 01 Jul 2026 00:00:00 GMTPower & DistributionPower FactorPower QualityCapacitor BanksHarmonicsUtility CostsPower & Distributionhttps://entogo.ca/insights/dry-type-vs-liquid-filled-transformers/https://entogo.ca/insights/dry-type-vs-liquid-filled-transformers/Dry-type transformers cool with air and solid insulation while liquid-filled units use mineral or less-flammable oil. The right pick turns on installation location, fire and code rules, voltage class, efficiency, and maintenance - not on which type is generally better.Mon, 29 Jun 2026 00:00:00 GMTPower & DistributionTransformersPower & DistributionDry-Type TransformersLiquid-Filled TransformersStandards & ComplianceBuyer Guidehttps://entogo.ca/insights/battery-storage-fire-safety-nfpa-855-ul-9540a/https://entogo.ca/insights/battery-storage-fire-safety-nfpa-855-ul-9540a/Lithium-ion battery storage in North America is governed by NFPA 855 and UL 9540A. NFPA 855 caps individual units at 20 kWh and requires three-foot separation unless UL 9540A large-scale fire-test data proves a fire will not spread, which shapes how a BESS is sited, spaced, and permitted.Sat, 27 Jun 2026 00:00:00 GMTEnergy StorageEnergy StorageBESSFire SafetyNFPA 855UL 9540AStandards & Compliancehttps://entogo.ca/insights/metal-clad-vs-metal-enclosed-switchgear/https://entogo.ca/insights/metal-clad-vs-metal-enclosed-switchgear/Metal-clad switchgear uses drawout breakers and grounded metal barriers between every compartment; metal-enclosed interrupter switchgear is simpler and built for lower fault duty. Here is how North American buyers match construction class, voltage, and fault duty to the application.Thu, 25 Jun 2026 00:00:00 GMTPower & DistributionSwitchgearPower & DistributionMedium VoltageSubstationsStandards & Compliancehttps://entogo.ca/insights/transformer-approval-certification-canada/https://entogo.ca/insights/transformer-approval-certification-canada/Before a transformer can be energised in Canada, the Canadian Electrical Code requires it to be "approved" — either certified by an SCC-accredited body (a CSA, cULus or cCSAus mark) or field-evaluated to CSA SPE-1000. A US-only "UL Listed" mark is not enough. Here is how the approval system actually works.Thu, 18 Jun 2026 00:00:00 GMTStandards & ComplianceTransformersCanadaCSACertificationField evaluationComplianceStandardshttps://entogo.ca/insights/transformer-overcurrent-protection-fault-current/https://entogo.ca/insights/transformer-overcurrent-protection-fault-current/How to size transformer primary and secondary overcurrent protection to NEC Table 450.3(B) and CEC Section 26 (Rule 26-254), and how to find the available fault current at the secondary for downstream AIC / SCCR — with worked US and Canada examples.Tue, 09 Jun 2026 00:00:00 GMTPower & DistributionTransformersOvercurrent protectionNEC 450.3(B)CEC Section 26Fault currentAIC / SCCRPower & Distributionhttps://entogo.ca/insights/how-transformers-are-sold-distribution-channels/https://entogo.ca/insights/how-transformers-are-sold-distribution-channels/Transformers reach buyers through four channels: direct OEM sales to utilities and EPCs, independent manufacturers' reps, two-step electrical distribution, and online procurement. With a global market near US$61B and 30% power-transformer supply deficits, the sales channel and sourcing have become strategic.Sat, 06 Jun 2026 00:00:00 GMTSales & DistributionTransformersSales channelsDistributionManufacturers representativesElectrical distributorsMarket demandhttps://entogo.ca/insights/how-to-size-a-transformer-kva-selection/https://entogo.ca/insights/how-to-size-a-transformer-kva-selection/How to convert a real electrical load into the right transformer kVA: the calculation, the standard ANSI/IEEE rating ladder, and the margins for continuous duty, future growth, ambient and altitude that sit between calculated load and nameplate.Sat, 30 May 2026 00:00:00 GMTPower & DistributionTransformerskVA sizingSpecificationNECANSI/IEEE C57Power & Distributionhttps://entogo.ca/insights/ai-data-center-power-equipment-2026/https://entogo.ca/insights/ai-data-center-power-equipment-2026/AI training loads have pushed rack densities past 100 kW and substation lead times past three years. This is what each layer of the data-center power chain — transformer, switchgear, energy storage — now has to deliver, and where projects actually compress the schedule.Thu, 28 May 2026 00:00:00 GMTAI & Data CentersAI data centersTransformersSwitchgearEnergy storageHyperscaleGrid interconnectionIEEE 519https://entogo.ca/insights/dc-fast-charger-installation-cost-2026/https://entogo.ca/insights/dc-fast-charger-installation-cost-2026/Public ranges for "DC fast-charger installation cost" span $50,000 to over $1 million per site — too wide to be useful. The Atlas/Paren analysis of NEVI awards, NREL deployment data and Rocky Mountain Institute rate-design work converge on a tighter cost stack, and on which lines actually move.Thu, 28 May 2026 00:00:00 GMTEV ChargingEV chargingDC fast chargerDCFCNEVIFleet chargingTotal cost of ownershiphttps://entogo.ca/insights/grain-oriented-electrical-steel-supply-chain/https://entogo.ca/insights/grain-oriented-electrical-steel-supply-chain/Every power transformer needs grain-oriented electrical steel (GOES), and the DOE estimates it is roughly a quarter of large-transformer cost. North America has one domestic producer — Cleveland-Cliffs' Butler Works. This is the supply chain behind the one-to-four-year lead time.Thu, 28 May 2026 00:00:00 GMTMarket & Supply ChainTransformersGrain-oriented electrical steelGOESSupply chainDOEIRAGrid reliabilityhttps://entogo.ca/insights/transformer-lead-times-north-america-2026/https://entogo.ca/insights/transformer-lead-times-north-america-2026/In 2026, transformers in North America's merchant market commonly take one to four years to deliver — driven by electrical-steel (GOES) constraints, surging data-center demand and an aging fleet. Manufacturers with their own source factory, such as Entogo at a 12-week standard lead time, sit largely outside that queue.Wed, 27 May 2026 00:00:00 GMTMarket & Supply ChainTransformersLead timesSupply chainData centersGrid reliabilityhttps://entogo.ca/insights/solar-storage-charging-explained/https://entogo.ca/insights/solar-storage-charging-explained/A solar-storage-charging system pairs on-site PV, a battery and EV charging behind a single grid connection, so charging draws on stored solar instead of the service entrance — enabling fast charging at sites whose utility supply could not sustain it alone.Wed, 20 May 2026 00:00:00 GMTSolar-Storage-ChargingSolar-storage-chargingEV chargingEnergy storageMicrogridhttps://entogo.ca/insights/cut-demand-charges-with-battery-storage/https://entogo.ca/insights/cut-demand-charges-with-battery-storage/Demand charges are billed on a facility's highest power draw, not its total energy use. Behind-the-meter battery storage discharges during those brief peaks to cap the demand, and shifts cheap off-peak or solar energy into expensive on-peak hours — lowering both parts of a commercial electricity bill.Wed, 15 Apr 2026 00:00:00 GMTEnergy StorageEnergy storageDemand chargesPeak shavingCommercial & industrialhttps://entogo.ca/insights/ac-vs-dc-ev-charging-north-america/https://entogo.ca/insights/ac-vs-dc-ev-charging-north-america/AC charging is slower, cheaper and ideal where vehicles dwell for hours; DC fast charging delivers high power for short stops but needs far more grid capacity. Matching charger type to dwell time, site load and budget is the first decision in any EV charging project.Tue, 10 Mar 2026 00:00:00 GMTEV ChargingEV chargingDC fast chargingAC chargingCharging infrastructurehttps://entogo.ca/insights/prefabricated-vs-conventional-substations/https://entogo.ca/insights/prefabricated-vs-conventional-substations/A prefabricated substation arrives as a factory-built, factory-tested package that drops onto a prepared pad, compressing months of on-site construction into days. For space-constrained, schedule-driven or repeatable projects, the modular approach usually wins on time, quality and total cost.Wed, 18 Feb 2026 00:00:00 GMTPower & DistributionSubstationsPrefabricated substationPower distributionGrid connection