product: ups: firstline p
TRANSCRIPT
Staco Energy Products Co.
Welcome
Who is Staco Energy Products Company ?
Staco Energy Products Co.
• Who are we?– A 75+ year old privately held manufacturer of voltage control and power quality products. Based in Dayton Ohio with 80 employees.
• What do we do??– We provide tailored power solutions to targeted
markets.
Staco Energy Products Co.
• How do we do it? – We partner with the best in every market
• Rep’s, Distributors, Integrators, OEM’s– We focus on specific vertical applications / markets
• WWT, Education, High Energy Physics, Process Manufacturing– We provide world class service and support
• Over 60 Factory trained service tech’s in the US. – We manufacture the best products on the market
• We back our products with the best warranties in the industry
Staco Energy Products Co.
65kVA / 58.5kW80kVA / 72kW100kVA / 90kW125kVA / 112.5kW160kVA / 144kw200kVA / 180kw250kVA / 225kw
FirstLine P UPS
• True double conversion, “On-Line”• Hot Swap Unit Capability• Digital Signal Process Control• Menu Selectable Monitoring Panel with Graphic display• Parallel up to 8 Modules• Dual Bus Configurations• Delayed Start Up on power source return• IGBT, PWM Inverter (Insulated Gate Bipolar Transistor) • Efficiency up to 98%• 0.99 High Input Power Factor• Configurable Power Walk-In• Sinusoidal Output Waveform
Major Components
• Rectifier complete with power factor correction• Fast Battery charger • Continuous duty rated Static Switch• Manual Maintenance Bypass• Input Isolation switch (SWIN)• Output Isolation switch (SWOUT)• Maintenance Isolation switch (SWMB)• Bypass Isolation switch (SWBY)• Parallel Kit (Standard)• 4 x 2 and 2 x 2 Voltage Configuration available
AC Input Characteristics
Nominal Voltage: 480 VAC, 3 Phase, 4-wire (plus ground) or 208Y/120 VAC, 3 Phase, 4-wire + ground with external line up and match transformer cabinet (Optional)Nominal Voltage Range: +15/-10% from nominal voltage during battery recharge.Voltage Range on battery: +15% / -40%Frequency Range: 45 - 65 Hz)Power Factor: > 0.99 at full load, nominal conditions.Current Harmonic Distortion (THDi): < 3%Inrush current: Less than nominal input current for less than one cycle.Input Surge Protection: UPS shall be equipped to withstand surges per ANSI/IEEE C62.41.Rectifier Walk-in: Progressive from 0 to 30 seconds (adjustable).Rectifier Walk-in Delay Timer: Progressive start of rectifier from 0 to 120 seconds (adjustable).
AC Output Characteristics
Voltage: 480Y/277 VAC, ± 1% steady state variation phase-to-phase voltage volts AC, three-phase, 4 wire plus ground (Standard Voltage) or 208Y/120 VAC, 3 Phase, 4-wire + ground - with external line up and match transformer cabinet (Optional).Frequency: 60Hz, + 2%, 60Hz, + .05% when free running.Voltage regulation: ±1% for balanced load, ±3% for 100% unbalanced load.Voltage Distortion: Maximum 2% total (THD).Voltage Transient (Step Load) Response: + 5% for 100% step load change.Voltage Recovery Time: Return to within 1% of nominal value within 20 milliseconds.Phase Angle Displacement: 120 degrees + 1 degree for balanced load; 120 degrees, + 1 degree for 100% unbalanced load.Non-Linear Load Capability: Output voltage total harmonic distortion shall be less than 2% when connected to a 100% non-linear load with a crest factor not to exceed 3%.
AC Output Characteristics (continued)
Slew Rate: 1 hertz/second maximum.Power Factor: 0.9 at the rated volt amperes .Inverter Overload Capability: 110% of rated load for 60 minutes, 150% of rated load for 1 minute.Bypass Overload Capability: 110% for 60 minutes, 125% for 10 minutes,150% for 1 minute.Output Waveform: SinusoidalEfficiency: (DC-AC): Minimum - 95% at Full Load, (AC-AC): Minimum – 93% at Full Load
Cabinet Configuration
A. Control panel with graphic displayB. Door handleC. Ventilation grillesD. Communication areaE. Front Cover panel with ventilation grillesF. Switch cover panelG. Door
1. SWIN: Input isolating switch2. SWOUT: Output isolating switch 3. SWMB: Maintenance isolating switch 4. WBY: Bypass isolating switch
A
B
D
C
E
1
2
3
4
G
G
F
Card Locations
A
F G
EDB
C
J
N
H
I
K
A. Parallel CardB. EPO ControlC. Remote Commands and AlarmsD. RS-232-2E. RS-232-1F. Slot 2 (Aux)G. Slot 1 (Main)H. Remote Alarm Dry Contact Card 1 (Optional)I. Remote Alarm Dry Contact Card 2 (Optional)J. Multi I/O Card (Optional)K. Interface Terminal ConnectorL. UGS (Optional)
Bottom Cable Entry (Standard)
Power Battery Cable Entry
External Control Cable Entry
Power AC Cable Entry
REAR
FRONT
UPS Bottom View
Air Flow (Forced & Convection)
The heat dissipation needed for the correct operation of the UPS is brought about by the air current made by the fans located inside the UPS (forced convection) and by the air around the side panels (natural convection).
Clearance: FRONT and at least one of the three side walls free: right, left or back.
Control Panel Display
Control Panel
Menus
Basic Control Functions
• Output Voltage – Selects the rated output voltage
• Operating Mode – Selects the operating Mode: On-Line, Stand-By ON, Smart Active
• Auto Off – If bypass line is present and the load is < of the set value than the load will be supplied from the bypass line. If the bypass line in not preset and the load is < of the set value than the load will not be supply (configurable 0 to 99%).
• Battery Low Warning – Estimated battery time remaining for low battery warning (configurable).
• Battery Capacity – Sets the Amp Hour Battery installed.
• Audible Alarm – Audible alarm operating mode: Enable/Disable
• Language Select area – English, Italian, German, French, Spanish, Polish or Turkish.
Advanced Control Functions
• Input Frequency Tolerance Range – Selects the acceptable range for the input frequency for switching to the bypass and for the synchronization of the output: +/- 1 to +/- 6 in 1% stages.
• Bypass Voltage Thresholds – Selects the acceptable voltage range for switching to the bypass: +/- 5 to +/- 25 in 1% stages.
• Bypass Voltage Threshold for ECO – Selects the acceptable voltage range for operation in ECO Mode: +/- 5 to +/- 25 in 1% stages.
• Switch-On Delay – Waiting time for automatic power-on after the return of power source voltage: Disable or configurable 1 to 255 in 1 second stages.
• Power Walk-In – Activates the gradual return to power source mode: Activated or Deactivate
• Power walk-In Duration – Sets the duration of the gradual return to power source voltage (only if Power Walk-In is activated: Minimum 0 seconds to maximum 125 seconds in 1 second stages.
• Inverter Synchronization Speed to Bypass Line – Selects the synchronization speed of the inverter to the bypass line: 0.1 to 1 Hz/sec (parallel units), 0.1 to 3 Hz/sec (single units).
Alarms
Normal Operation
Disturbances on Bypass Line
Manual Bypass (SWMB) On
Bypass Line Volt, Failure
Main Line Voltage Failure
Pre-alarm, Low Battery Voltage
Low Battery Charge or Closed Disconnect
Low Input Voltage
Output Overload
Internal Fault
Temporary Bypass, Wait
Bypass for Output Overload
Bypass Command ON or OFF
Remote Bypass Command Active
Over-temperature or Fan Failure
Input Voltage Sequence not OK
Output Off
System Off Command ON or OFF
Remote System Command ON or OFF
Auto-shutdown Timer ON
System Off
Battery test ON
Parallel Cable Fault
Fuse Fault
Battery Discharge Fail
High Battery Temperature
Slave UPS OFF
Fan Fault
Parallel Redundant Lost: High Unit Power
Parallel Redundant Lost: Unit OFF
Break Circuit Fail
Break Circuit Overload
Rectifier Switched Off by Remote Command
UPS Service Required
Battery Service Required
Input Switch Off
Insulation Loss-AC
Insulation Loss-DC
Over-temperature On Bypass Line Transfer
Inverters Off
FirstLine P 65 – 125kVA UPS Models
Model Number DescriptionDimensionsH” x W” x D”
Weight.(lbs.)
480V x 480V
FLU-065-0065kVA /58.5kW 480V/480Y/277,
50/60Hz75 x 31.5 x 33.5 1,499
FLU-080-0080kVA /72kW
480V/480Y/277, 50/60Hz
75 x 31.5 x 33.5 1,499
FLU-100-00100kVA /90kW, 480V/480Y/277,
50/60Hz75 x 31.5 x 33.5 1,609
FLU-125-00125kVA /112.5kW, 480V/480Y/277,
50/60Hz75 x 31.5 x 33.5 1,742
FirstLine P 160 – 250kVA UPS Models
Model Number Description
DimensionsH” x W” x D”
Weight.(lbs.)
480V x 480V
FLU-160-00160kVA /144kW,
480V/480Y/277, 50/60Hz 75 x 39.5 x 33.5 1,984
FLU-160-T160kVA /144kW,
480V/480Y/277, 50/60Hz w/ Internal Bypass
75 x 55 x 33.5 2,326
FLU-200-00200kVA /180kW,
480V/480Y/277, 50/60Hz 75 x 39.5 x 33.5 2,205
FLU-200-T200kVA /180kW,
480V/480Y/277, 50/60Hz w/ Internal Bypass
75 x 55 x 33.5 2,546
FLU-250-00250kVA /225kW,
480V/480Y/277, 50/60Hz 75 x 39.5 x 33.5 2,425
FLU-250-T250kVA /225kW,
480V/480Y/277, 50/60Hz w/ Internal Bypass
75 x 55 x 33.5 2,767
FirstLine P Application Notes
1. The FLU-160-00, FLU-200-00 & FLU-250-00 units DO NOT have an internal bypass. If specification requires internal bypass the -T Model MUST be used.
2. In all cases, if the specification requires an internal and external bypass you MUST use the -T Model plus the Line Up & Match
bypass cabinet.
UPS Cabinet 65 – 125kVA
UPS Cabinet 160 – 250kVA w/o Bypass
UPS Cabinet 160 – 250kVA with Bypass
UPS Cabinet - Internal
FirstLine P with Battery Cabinet
The UPS uses a valve-regulated sealed lead acid (VRLA) heavy duty industrial battery, designed for auxiliary power service in a UPS application. The primary battery is furnished with impact-resistant plastic cases and housed in a matching cabinet(s) next to the UPS. The UPS is capable of utilizing Wet Cell & NiCad batteries.
Protection Against Deep Discharge and Self-Discharge: The UPS is equipped with a device designed to protect the battery against deep discharge, depending on discharge conditions, with isolation of the battery by a circuit breaker. From the monitoring panel you can adjust the battery shutdown voltage as a function of a discharge coefficient to avoid excessive discharge at less than the rated output. A second device helps avoid self-discharge of the battery into the UPS control circuits during an extended shutdown of the UPS (over two hours).Battery Self-Tests: 1. The battery monitoring system performs the following automatic functions:
• Battery circuit check, programmable 9-99 days. • Partial discharge test every three months.
Standard External Battery Models
Model Number Voltage#
CabinetsInternal Strings
NumberBatteries
DimensionsH” x W” x D”
Weight(lbs.)
FLU-BAT-200-1-480-B 480 1 1 40 75 x 26.3 x 38 2,307FLU-BAT-200-2-480-B 480 1 2 80 75 x 26.3 x 38 3,932FLU-BAT-300-2-480-B 480 1 2 80 75 x 26.3 x 38 3,923
The FLU-BAT-300-2-480-B is ONLY used with the 100kVA and 125kVA.The FLU-BAT-200-480-1-B can be used with a FLU-BAT-300-2-480-B
FirstLine P Battery Back Up Times (Minutes)
65kVA 200W/50AH 1 1 26 14 8 2,100
1 2 66 39 26 3,700 2 3 107 66 46 5,800 2 4 149 93 66 7,400 3 5 190 121 86 9,500 3 6 229 149 107 11,100 4 7 266 171 128 13,200 4 8 301 204 149 14,800 80kVA 200W/50AH 1 2 38 30 19 3,700
2 3 84 51 35 5,800 2 4 118 73 51 7,400 3 5 152 95 67 9,500 3 6 185 118 84 11,100 4 7 217 141 101 13,200 4 8 248 163 118 14,800 100kVA 200W/50AH 1 2 38 21 14 3,700
2 3 64 38 25 5,800 2 4 90 55 38 7,400 3 5 118 73 51 9,500 3 6 145 90 64 11,100 4 7 172 109 77 13,200 4 8 198 127 90 14,800 125kVA 200W/50AH 1 2 30 16 10 3,700
2 3 51 30 20 5,800 2 4 73 44 30 7,400 3 5 95 58 40 9,500 3 6 118 73 50 11,100 4 7 141 88 62 13,200 4 8 164 103 73 14,800
kVA/Watts/Ah # CABINETS # STRINGS 50% LOAD 75% LOAD 100 % LOAD Weight (lbs.)
FirstLine P Battery Back Up Times (Minutes)
160kVA 200W/50AH 2 3 35 19 12 5,800 2 4 51 30 19 7,400 3 5 67 40 27 9,500 3 6 84 51 35 11,100 4 7 101 61 43 13,200 4 8 118 73 51 14,800 200kVA 200W/50AH 2 3 25 14 8 5,800 2 4 38 21 14 7,400 3 5 51 30 19 9,500 3 6 64 38 25 11,100 4 7 77 46 32 13,200 4 8 90 55 38 14,800 250kVA 200W/50AH 2 4 28 15 9 7,400 3 5 38 21 14 9,500 3 6 48 28 18 11,100 4 7 58 34 23 13,200 4 8 69 41 28 14,800
kVA/Watts/Ah # CABINETS # STRINGS 50% LOAD 75% LOAD 100 % LOAD Weight (lbs.)
External Battery Cabinet
Battery Cabinet - Internal
Standard Battery Characteristics
Standard BatteryValve Regulated Lead Acid (VRLA), Sealed Maintenance Free, CSB HR12200W specifically designed for high efficient discharge applications. Its characteristics are high energy density, small footprint and high discharge efficiency. Rated for more than 260 cycles at 100% discharge, in cycle service, up to 10 years in standby service. .
6 Cells per unit12 volts per unit200 Watt, 50Ah
Battery Voltage: 420 volts DC minimum before cutoff, 540 volts float.
Maximum DC Current: Maximum DC current at cutoff voltage:80kVA -196 amperes ,100kVA – 236 amperes,125kVA – 296 amperes
FirstLine P 4 x 4 Bypass Models
Part Number
kVA
Voltage
Description
DimensionsH” x W” x D”
Wt. (lbs.)
FLU-P-65-MBPS
65
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 15.75 x 33.35
250
FLU-P-80-MBPS
80
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 15.75 x 33.35
250
FLU-P-100-MBPS
100
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 15.75 x 33.35
250
FLU-P-125-MBPS
125
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 15.75 x 33.35
250
FLU-P-160-MBPS
160
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 30 x 33.5 350
FLU-P-200-MBPS
200
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 30 x 33.5 350
FLU-P-250-MBPS
250
480-
480Y/277
3 Breaker External Line Up & Match Maintenance Bypass, Top Cable Entry & Interlocks
75 x 30 x 33.5 350
65 – 125kVA 4 x 4 - 3 Breaker MBP Cabinet
160 – 250kVA 4 x 4 - 3 Breaker MBP Cabinet
4 x 2 & 2 x 2 Transformer/ Bypass Cabinet
FirstLine P Top Entry Side Car Model
Part Number
kVA
Voltage
Description
DimensionsH” x W” x D” Wt. (lbs.)
FLU-CEC All
480
Top Cable Entry Side Car, allows for top or side cable entry.
75 x 15.75 x 33.35
250
Top Entry Side Car Cabinet
FirstLine P 2 x 2 Transformerless PDU
Part Number kVAOutputVoltage Description
DimensionsH” x W” x D”
FLU-PDC-P2 All 208V-208Y/120
Transformerless Line Up & Match Power Distribution (PDU) with (2) 42 Pole, 225 Amp Panelboards, with Mains and type Sq. D NQ442L2. Accepts 1, 2 & 3 Pole Branch Circuit Breakers bolt-on or plug-in.
75 x 22 x 33.35
Transformerless 2 x 2 PDU Cabinet
Single or Dual Source Input – No Bypass
Single Input Dual Input
Single or Dual Source Input w/Bypass
Single Input Dual Input
2 x 2 Input/Output Transformers w/Bypass
Single Input Dual Input
208V Output Transformers w/Bypass
Single Input Dual Input
Paralleled Systems
Paralleling
The UPS has expansion capabilities for up to 8 modules paralleled for capacity or redundancy as required to support future growth. The UPS units can be connected in parallel and shall share the current and load between them.In a system with several UPS units connected in parallel, there is a single MASTER unit and the remaining units are SLAVE units. The UPS units must be the same rating and the MASTER is chosen on start-up. The MASTER and SLAVE units can exchange roles. If a unit is being serviced, e.g. due to an inverter fault, it will automatically be excluded. The load at this point will be shared between the units that are still active; if the power in output is excessive for the remaining UPSs, the system logic will switch all the units, including the UPS that was excluded, onto the by-pass line.
Communication Options
PowerShield: Communication Software provides efficient, user-friendly UPS management using bar chart displays to show major operational information such as the input voltage, UPS load % and batteries charge %. The software also provides detailed information on fault conditions and UPS operating characteristics. PowerShield3 has been developed with a client/server architecture that makes it flexible and easy to use, and provides multi-lingual and on-line support.
Operating systems supported include Windows 2000, 2003Server, XP, Vista, 2008 Server, 7, Linux, Novell Netware, Mac OS X and most common UNIX operating systems such as: IBM AIX, HP, SUN Solaris INTEL and SPARC, SCO Uniware and Open Server, Silcon Graphics IRIX, Compaq Tru64 UNIX and DEC UNIX, Open BSD UNIX and FreeBSD UNIX, NCR UMIX, HP Open VMS VMWare ESX and VSPHERE.
PowerShield
Communication Options
PowerNETGuard: Supervision software provides centralize UPS management using network interface (SNMP) communications. It is ideal for Data Centre managers and medium to large sized networks. PowerNETGuard uses the RFC1628 standard Management Information Base (MIB) and ensures standardized UPS management wherever they are located.Operating systems supported include Windows (98, ME, NT, 2000, 2003, XP and Vista), Kinux, MacOSX, Solaris 8, 9 and 10 and Silcon Grapics IRIX.
PowerNETGuard
Communication Options
Netman Plus: Allows UPS management across a LAN using any of the main network communication protocols - TCP/IP, HTTP and network interface (SNMP). NetMan Plus enabled UPS integrate easily into medium and large sized networks and provide reliable communications between the UPS and management systems employed.
Netman PLUS (LAN / WAN)
Netman PLUS (WAN)
Communication Options
MultiCOM MODBUS/JBUS: Protocol converter used to monitor the UPS using the MODBUS/JBUS protocol on RS232 or RS485 serial lines. It can also manage a second independent RS232 serial line that can be used to connect to other devices such as the Netman or a PC using PowerShield software.
Communication Options
MultiCOM Serial/USB:
Provide the UPS with an additional RS232 serial interface or USB port. The USB port allows the UPS to communicate with Apple Macintosh computers as well as Windows and Linux operating systems.
Communication Options
Multi I/O: Protocol converter provides a configurable input and output signal contacts to allow UPS integration with control systems. It can be used to connect two devices to a single UPS serial communication port. It can also communicate using the MODBUS/JBUS protocol on RS485 lines.
Communication Options
IBM AS/400 Communication Kit: Provides a single-level memory management feature that makes it compulsory for the system to be shutdown in a controlled and orderly manner. Without UPS protection an AS/400 is not protected from mains failures. A momentary loss of power can cause hardware damage, data corruption and a lengthy reboot period.
Communication Options
I/O Expansion Card: Provides addition remote alarm functions as identified below. The card contains 6 outputs: potential-free contacts for alarms (programmable from the display panel) (and capable of switching up to 30 V AC or DC at UP 1 Amp) , 2 inputs (programmable from the panel) and 1 12V DC maximum 100mA auxiliary input. 2 additional slots shall be available for a total of 12 additional contacts.
•Disturbances on Bypass Line•Manual Bypass ON•Bypass Line Voltage Fail•Main Line Voltage Fail•Pre-alarm , Low Battery Voltage•Low Input Voltage •Output Overload•Internal Fault•Bypass for Output Overload•Over Temperature or Fan Failure•Input Voltage Sequence OK•Output OFF
Environmental Sensor Option
Netman Environmental Sensor: Monitors and record environmental conditions as well as activities in protected areas and at the premises where the UPS is installed. Environmental sensors monitor and record environmental conditions and activities within a designated building area. The sensors provide extensive management and control, triggering cooling fans and locks in response to changes in temperature and humidity. Remote monitoring and control can be provided via the internet, SNMP and PowerShield software. NetMan Plus can support up to 6 separate sensors. The environmental sensors are easy to install and do not need a separate external power supply.
Remote Monitor Panel Option
MultiPanel - Remote Monitoring Panel: Provides a detailed UPS status overview in real time. It is compatible with all FirstLine P UPS’s and can display values for UPS specific input and output supplies, and battery set measurements. MultiPanel has a high-definition graphical display and can report in 7 languages: English, Italian, German, French, Spanish, Russian and Chinese.3 independent serial ports are provided, one which allows for UPS monitoring via the MODBUS/JBUS protocol (on either an RS485 or RS232 serial line). The others can be used with devices such as the Netman Plus or a PC running PowerShield software.
Other Options
Seismic Bracing & Withstand CertificationSite specific Seismic Bracing for Zone A-F with certification and drawings available.
Top or Side Cable EntryStandard cable entry is from the bottom with availability for top or side incoming entry.
Harsh Environment EnclosureThe UPS and any accessory cabinet(s) are capability of being mounted and completely wired internal to, include AC cooling, inside any NEMA type enclosure (NEMA 12, 3R, 4X) by the manufacturer.
Spare PartsAvailable in three levels - Minor, Moderate and
Major Service Agreements
Multi level service and maintenance agreements available.
An Engineers Comment:
“ I recently I had the pleasure to specify and install the Staco FirstLIne P UPS at one of my high-profile customers . Having been in sales & service of UPS systems since 1977, it is rare that a real "gem" comes along! When it comes to a UPS--I would consider this as a gem.”
Demps E. Bannerman, PhD., E.E.
Service
Services Tailored to our customers needs Five levels of service
System startup to full on site support Local factory trained Technicians Spare parts kits, batteries monitoring and
replacement, site power quality survey, infrared thermo scan and more.
ID
AZ
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KS
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IL
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South-Central Region
South East Region
Mid Atlantic Region
Rocky Mount Region
Midwest Region
North East Region
Territory Manager Regional Team Leader
Field Service Tech
07/26/08 D. Crocker
Western Territory Eastern Territory
CGS Reqs
Central Territory
Eastern Dispatcher 8am-5pm EST
Central Dispatcher 7am-4pm EST
Western Dispatcher 10am-7pm EST
WY
NM
West Coast RegionRegional TSS
Start Up Check List:
PURPOSE: Work to cover during startup of all models of First Line Uninterruptible Power Supplies.
INSTRUCTIONS: Check for physical damage to the system cabinets. Verify that all shipping covers, inserts, and brackets are removed as specified in the
User’s Handbook. Verify that the UPS is installed in a clean, temperature controlled area, and the
environment meets all criteria in the User’s Manual. Verify all internal connections and components are in the proper place and secure. Survey physical location of the system. (Accessibility, lighting, cleanliness, ventilation Survey additional customer equipment being present (TVSS, Generator, Motors,
Capacitors, and Transformers). Survey electrical Installation of UPS regarding wire size and circuit protection.• Dual Source connections: In equipment’s with separate bypass line, an isolation
transformer must be placed at any of both input power supply mains of the UPS (rectifier input or static bypass), in order to avoid the direct connection of the neutral of both mains through the internal wiring of the equipment. This is only applicable power supply comes from two different electrical mains, as for example: - Two different electrical companies. - One electrical company and a generator set, ...
Staco Energy Products Co.
Questions?
Staco Energy Products Co.