LECTRO 36VDC User manual

CPR
TM
Series Broadband Power Supply
36VDC and 48VDC Technical Manual
Effective: March, 2004
®

Power
Alpha Technologies. Protecting The Power in Communications.

NOTE: Photographs contained in this manual are for illustrative purposes only. These
photographs may not exactly match your installation.
NOTE: Review the drawings and illustrations contained in this manual before
proceeding. If there are questions regarding the safe operation of this powering
system, please contact Alpha Technologies or your nearest Alpha
representative.
NOTE: Alpha denies responsibility for any damage or injury involving its enclosures,
power supplies, generators, batteries, or other hardware when used for an
unintended purpose, installed or operated in an unapproved manner, or
improperly maintained.
CPR
TM
Series Broadband Power Supply Technical Manual
Effective: March, 2004
745-573-B0-001 REV. A — © 2004 Alpha Technologies
Contacting Alpha Technologies:
For general product information and customer service
1-800-863-3930
(7:00 AM to 5:00 PM Pacific Time )
For complete technical support
1-800-863-3364
(7:00 AM to 5:00 PM Pacific Time, or 24/7 emergency support)
EC DECLARATION OF CONFORMITY
Units that are labeled with a CE mark comply with the following EU directives:
73/23/EEC Council Directive on equipment designed for use within certain voltage limits.
93/68/EEC Amending Directive 72/23/EEC.
89/336/EEC Council Directive relating to electromagnetic compatibility.
The EC Declaration of conformity is available upon request for products with a CE mark. For copies of
the EC Declaration of Conformity, contact Alpha Technologies.

4
Preface
745-573-B0-001 REV. A
Contents
Important Safety Instructions...................................................................................................................... 6
General Safety Precautions ....................................................................................................................... 7
Battery Safety Notes .................................................................................................................................. 9
Battery Maintenance Guidelines .............................................................................................................. 10
Recycling and Disposal Instructions..........................................................................................................11
Electrical Safety.........................................................................................................................................11
Mechanical Safety.................................................................................................................................... 12
1.0 Overview
1.1 Introduction..................................................................................................................................... 13
1.2 Cabinet Nomenclature.................................................................................................................... 14
2.0 Cabinet Installation
2.1 Pole Mounting................................................................................................................................. 16
2.2 Ground Mounting............................................................................................................................ 18
2.3 Enclosure Grounding...................................................................................................................... 20
2.4 Electrical Connections .................................................................................................................... 21
3.0 Power Supply Installation
3.1 CPR™ Module Installation and Connection ................................................................................... 22
3.2 Battery Installation and Connection ................................................................................................ 25
3.2.1 48V Battery Installation Procedure ........................................................................................26
3.2.2 36V Battery Installation Procedure ........................................................................................27
3.2.3 Connecting an Additional 48V Battery String ......................................................................... 28
3.2.4 Connecting an Additional 36V Battery String ......................................................................... 28
3.2.5 Removing Batteries ............................................................................................................... 30
3.3 Operation........................................................................................................................................ 33
3.4 Maintenance ................................................................................................................................... 35
3.4.1 Routine Maintenance Checks................................................................................................35
3.4.2 CPR™ Power Supply Maintenance Log Sheet ..................................................................... 36
3.4.3 Battery Storage ...................................................................................................................... 37
3.4.4 Proper Usage ........................................................................................................................ 37
3.4.5 Periodic Maintenance ............................................................................................................ 37
4.0 Troubleshooting
4.1 Troubleshooting Guide Part 1......................................................................................................... 38
4.2 Troubleshooting Guide Part 2......................................................................................................... 39
5.0 Status Monitoring
5.1 Installation ...................................................................................................................................... 40
5.2 Operation........................................................................................................................................ 41
5.3 Maintenance ................................................................................................................................... 42
6.0 Specifications
6.1 Electrical, Mechanical Specifications .............................................................................................. 43

5
Preface
745-573-B0-001 REV. A
Figures & Tables
1.0 Overview
Fig. 1-1, Ground Mount (Front View of 4 battery cabinet with ground skirt)................14
Fig. 1-2, Pole Mount (Front View of 8 battery cabinet)................................................14
Fig. 1-3, Pole Mount (Rear View of cabinet) ...............................................................15
Fig. 1-4, Typical Placement of Disconnect Breaker on rear of Cabinet.......................15
Fig. 1-5, Coax “Feed Thru” Adapter Normal Location (Bottom Shelf) .........................15
2.0 Cabinet Installation
Fig. 2-1, Pole Mount Installation..................................................................................16
Fig. 2-2, Pad Dimensions............................................................................................19
Fig. 2-3, Enclosure Grounding ....................................................................................20
3.0 Power Supply
Fig. 3-1, Front panel layout (all models)......................................................................22
Fig. 3-2, Connection points for 60Hz, 15A units..........................................................24
Fig. 3-3, Connection points for 50Hz units ..................................................................24
Fig. 3-4, Connection points for 60Hz, 24A units..........................................................24
Fig. 3-5, 48V Battery Connections – Single String ......................................................26
Fig. 3-6, 36V Battery Connections – Single String ......................................................27
Fig. 3-7, 48V Battery Connections – Parallel Strings ..................................................28
Fig. 3-8, 36V Battery Connections – Parallel Strings ..................................................29
Fig. 3-9, 48V Parallel Battery Sense Wiring................................................................30
Fig. 3-10, 36V Parallel Battery Sense Wiring................................................................31
Fig. 3-11, 36V Single Battery Sense Wiring..................................................................32
Fig. 3-12, Front Panel Display ......................................................................................33
Fig. 3-13, Maintenance Log Sheet................................................................................36
4.0 Troubleshooting
Table 4-1, Troubleshooting guide, Part 1.......................................................................38
Table 4-2, Troubleshooting guide, Part 2.......................................................................39
5.0 Status Monitoring
Fig. 5-1, CPRBattery Removal
6.0 Specifications
Table 6-1, Specifications................................................................................................43
Table 6-2, Specifications................................................................................................44

6
Preface
745-573-B0-001 REV. A
NOTE: Alpha Technologies’ products are subject to change through continual improvement
processes. Therefore, specifications and/or design layouts may vary slightly from
descriptions included in this manual. Updates to the manual will be issued when
changes affect form, fit or function.
Reviewthe drawingsand illustrationscontainedin thismanual beforeproceeding.Ifthereareanyquestions
regarding the safe installation or operation of the system, contact Alpha Technologies or the nearest
Alpha representative. Save this document for future reference.
To reduce the risk of injury or death caused by electrical shock, explosion of fuel or moving parts; and to
ensure the continued safe operation of this product, the following symbols have been placed throughout
this manual. Where these symbols appear, use extra care and attention.
DANGEROUS VOLTAGE
This symbol indicates a “dangerous voltage” may exist in this area of the product. Use caution
whenever working in the area to prevent electrical shock.
INHALATION HAZARD - DON’T BREATHE VAPORS
This symbol indicates an “inhalation hazard” may exist in this area of the product. Use caution
wheneverworkingin theareato preventpossibleinhalation of harmful (fuel or exhaust) vapors.
NO MATCHES OR OPEN FLAMES
This symbol indicates a “fire or explosive hazard” may exist in this area of the product. Use
caution whenever working in the area to prevent possible combustion of fuel vapors.
MECHANICAL OR MOVING PARTS HAZARD
These symbols indicate a “mechanical or moving parts hazard” may exist in this area of the
product. Use caution whenever working in the area to prevent possible injury to the operator or
service personnel.
LEAK HAZARD
Thissymbol indicates a “leak hazard” may exist in this area of the product.Usecautionwhenever
working in this area to prevent and correct any leaks detected.
ATTENTION
This symbol indicates important installation, operation or maintenance instructions. Always
follow these instructions closely.
Contained In This Manual.
Read This Manual Before Proceeding!
Important Safety Instructions

7
Preface
745-573-B0-001 REV. A
A “Warning” identifies conditions and actions that pose a hazard to the user.
A “Caution” identifies conditions and actions that may damage the power supply or associated
equipment.
Warnings
NOTE: This enclosure and its associated hardware (power supply, batteries,
cabling) may contain equipment, batteries or parts which have accessible
hazardous voltage or currents.
To avoid injury:
• This enclosure and its associated hardware must be serviced by authorized personnel only.
• Enclosure must remain locked at all times, except when authorized service personnel are
present.
• Remove all conductive jewelry or personal equipment prior to servicing equipment, parts,
connectors,wiring, or batteries.
• Read and follow all installation, equipment grounding, usage, and service instructions
included in this manual.
• Use proper lifting techniques whenever handling enclosure, equipment, parts, or batteries.
• Batteries contain dangerous voltages, currents and corrosive material. Battery installation,
maintenance, service and replacement must be performed by authorized personnel only.
• Never use uninsulated tools or other conductive materials when installing, maintaining,
servicing or replacing batteries.
• Use special caution when connecting or adjusting battery cabling. An improperly connected
battery cable or an unconnected battery cable can result in arcing, a fire, or possible
explosion.
• A battery that shows signs of cracking, leaking or swelling must be replaced immediately by
authorized personnel using a battery of identical type and rating.
• Avoid any contact with gelled or liquid emissions from a valve-regulated lead-acid (VRLA)
battery. Emissions contain dilute sulfuric acid which is harmful to the skin and eyes.
Emissions are electrolytic, which are electrically conductive and are corrosive. Follow the
Chemical Hazards notes if contact occurs.
• Do not smoke or introduce sparks in the vicinity of a battery.
• Under certain overcharging conditions, lead-acid batteries can vent a mixture of hydrogen
gas which is explosive. Proper venting of the enclosure is required.
• Follow the battery manufacturer’s approved transportation and storage instructions.
General Safety Precautions

8
Preface
745-573-B0-001 REV. A
Cautions
NOTE: Enclosure, equipment or parts may be damaged or cause damage if used
or installed improperly.
To avoid damage:
•Prior to installation, verify that the AC input voltage to the enclosure and its equipment
match with respect to voltage and frequency.
•Prior to installation, verify that the output voltage from the enclosure or its equipment match
the voltage requirements of the connected equipment (load).
•Prior to installation, verify that the enclosure’s utility service panel is equipped with a
properly rated circuit breaker for use with the equipment inside. Refer to manufacturer’s
recommendations.
•Review and upgrade utility service panel circuit breaker requirements whenever the
equipment within the enclosure is changed.
•Prior to installation, contact local utilities, local building maintenance departments, and
cable/piping locator services to ensure that installation does not interfere with existing utility
or building cables/piping.
•Do not exceed the output rating of equipment. Verify load requirements prior and during
connection process.
•Prior to handling the batteries, touch a grounded metal object to dissipate any static charge
that may have developed on your body.
•Alpha Technologies is not responsible for unit damage due to enclosure or installation
temperatures which exceed the operating temperature of the product.
•The Lectro CPR UPS is a 36 or 48Vdc system designed for use with either a single or dual
string of three or four 12Vdc batteries. Please refer to Section 3 of this manual for more
details on proper battery installation, maintenance, storage, and replacement procedures
•Over current protection and disconnecting means for the AC output are to be supplied by the
electrical installer as required by local electrical codes.
•The operating temperature range for the Lectro CPR®UPS is –40°C to +55°C for air at the
intake of the CPR module.
•CPR UPS installations involving third-party cabinets, not supplied by Lectro or Alpha, require
adequate ventilation, airflow and spacing to ensure that the CPR®power supply operates
within a temperature range of -40°C to +55°C. Failure to provide an operating thermal
environment per published specifications will void the warranty.
General Safety Precautions

9
Preface
745-573-B0-001 REV. A
Lead-acid batteries contain dangerous voltages, currents and corrosive material. Battery installation,
maintenance, service and replacement must be performed by authorized personnel only.
Chemical Hazards
NOTE: Any gelled or liquid emissions from a valve-regulated lead-acid (VRLA) battery
contain dilute sulfuric acid, which is harmful to the skin and eyes.
Emissions are electrolytic, which are electrically conductive and corrosive.
To avoid injury:
• Servicing and connection of batteries shall be performed by, or under the direct supervision
of, personnel knowledgeable of batteries and the required safety precautions.
• Always wear eye protection, rubber gloves, and a protective vest when working near
batteries. Remove all metallic objects from hands and neck.
• Batteries produce explosive gases. Keep all open flames and sparks away from batteries.
• Use tools with insulated handles, do not rest any tools on top of batteries.
• Batteries contain or emit chemicals known to the State of California to cause cancer and
birth defects or other reproductive harm. Battery post terminals and related accessories
contain lead and lead compounds. Wash hands after handling. (California Proposition 65)
• Wear protective clothing (insulated gloves, eye protection, etc.) whenever installing,
maintaining, servicing, or replacing batteries.
• If any battery emission contacts the skin, wash immediately and thoroughly with water.
Follow your company’s approved chemical exposure procedures.
• If any battery emission contacts the eye, wash immediately and thoroughly with water for 10
minutes with pure water or a special neutralizing eye wash solution and seek immediate
medical attention. Follow your company’s approved chemical exposure procedures.
• Neutralize any spilled battery emission with the special solution contained in an approved
spill kit or with a solution of 1 lb. Bicarbonate of soda to 1 gallon of water. Report chemical
spill using your company’s spill reporting structure and seek medical attention if necessary.
• Always replace batteries with those of an identical type and rating. Never install old or
untested batteries.
• Do not charge batteries in a sealed container. Each individual battery should have at least
0.5 inches of space between it and all surrounding surfaces to allow for convection cooling.
• All battery compartments must have adequate ventilation to prevent an accumulation of
potentially dangerous gas.
Battery Safety Notes

10
Preface
745-573-B0-001 REV. A
The battery maintenance instructions listed below are for reference only. Battery manufacturer’s
instructions for transportation, installation, storage or maintenance take precedence over these
instructions.
yTo prevent damage, inspect batteries every 3 months for:
ySigns of battery cracking, leaking or swelling. The battery should be replaced
immediately by authorized personnel using a battery of the identical type and rating.
ySigns of battery cable damage. Battery cable should be replaced immediately by
Authorized Personnel using replacement parts specified by vendor.
yLoose battery connection hardware. Refer to battery manufacturer’s documentation for
the correct torque and connection hardware for the application.
yApply battery manufacturer’s specified antioxidant compound on all exposed
connections.
yVerify battery terminals and/or exposed connection hardware is not within 2 inches of a
conductive surface. Reposition batteries as necessary to maintain adequate clearance.
yClean up any electrolyte (battery emission) in accordance with all federal, state, and
local regulations or codes.
yProper venting of the enclosure is recommended. Follow the Battery Manufacturer’s
approved transportation and storage instructions.
yAlways replace batteries with those of an identical type and rating. Never install old or
untested batteries.
yDo not charge batteries in a sealed container. Each individual battery should have at
least 0.5 inches of space between it and all surrounding surfaces to allow for convection
cooling.
yAll battery compartments must have adequate ventilation to prevent an accumulation of
potentially dangerous gas.
yPrior to handling the batteries, touch a grounded metal object to dissipate any static
charge that may have developed on your body.
yNever use uninsulated tools or other conductive materials when installing, maintaining,
servicing or replacing batteries.
yUse special caution when connecting or adjusting battery cabling. An improperly
connected battery cable or an unconnected battery cable can make contact with an
unintended surface that can result in arcing, fire, or possible explosion.
yA battery showing signs of cracking, leaking, or swelling should be replaced immediately
by authorized personnel using a battery of identical type and rating.
yUnder extreme overcharging conditions, Lead-acid batteries can vent a mixture of
Hydrogen gas which is explosive.
Battery Safety Notes, continued
Battery Maintenance Guidelines

11
Preface
745-573-B0-001 REV. A
yLethal voltages are present within the power supply and electrical boxes. Never assume
that an electrical connection or conductor is not energized. Check the circuit with a volt
meter with respect to the grounded portion of the enclosure (both AC and DC) prior to
any installation or removal procedure.
yDo not work alone under hazardous conditions.
yA licensed electrician is required to install permanently wired equipment.
yInput voltages can range up to 240 VAC. Ensure that utility power is disabled before
beginning installation or removal.
yEnsure no liquids or wet clothes contact internal components.
yHazardous electrically live parts inside this unit are energized from batteries even when
the AC input power is disconnected.
CAUTIONS
An agency-approved service disconnect switch is required at installation and shall be connected
between the utility power source and the CPRTM power supply. The service disconnect and service
disconnect installation is subject to local electrical codes and should be approved for application in a
NEMA 3R enclosure, rated 120/240V, with a non-interrupted neutral termination.
yFor 120 VAC 60 Hz units, the service disconnect shall be a high-magnetic type circuit
breaker rated for 20 amperes in the line lead only.
yFor 240 VAC units, the service disconnect shall be a 2 pole, high-magnetic type circuit
breaker rated for 15 amperes.
yFor 220 VAC 60Hz and 230 VAC 50 Hz units, the service disconnect shall be a high-
magnetic type circuit breaker rated for 16 amperes in the line lead only.
yFor 120 VAC 60 Hz units, use #12 AWG (minimum) copper, 75°C, for all utility input
wiring.
yFor 240 VAC 60 Hz units, use #12 AWG (minimum) copper, 75°C, for all utility input
wiring.
yFor 230 VAC 50 Hz units, use a minimum of 1.5 mm2(#16 AWG copper, 75°C, for all
mains input wiring).
ySpent or damaged batteries are considered environmentally unsafe. Always recycle
used batteries or dispose of the batteries in accordance with all federal, state and local
regulations.
Recycling and Disposal Instructions
Electrical Safety

12
Preface
745-573-B0-001 REV. A
yKeep hands and tools clear of fans. Fans are thermostatically controlled and will turn on
automatically.
yPower supplies can reach extreme temperatures under load.
yUse caution around sheet metal components and sharp edges.
Mechanical Safety

13
745-573-B0-001 REV. A
1.0 Overview, Continued
The Lectro CPR®Broadband Powering System is a result of an integrated approach that combines
proven line-interactive UPS technology with rugged ferro technology. The tradtional advantages of a
ferroresonant output, combined with high-capacity surge suppression, advanced microprocessor control,
improved thermal performance and greater operating efficiency provide for a lighter, smaller, and more
efficient unit.
This manual contains important instructions for the Lectro Uninterruptible Power Supply (UPS). These
instructions should be followed during installation and maintenance of the power supply, batteries,
cabinet, status monitor and any options and/or ancillary equipment.
The purpose of this manual is to provide the reader with the necessary information to install the
enclosure, the power supply, connect the battery strings, perform an initial turn up and test of the CPRTM
Power Supply, and to perform basic troubleshooting tasks.
Upon receipt of the system, verify the following:
The equipment has arrived undamaged.
All ordered options have arrived.
Before installation:
Verify the following:
• All necessary grounding rods and materials in place.
• Utility power run to site in accordance with the National Electric Code (NEC).
1.0 Overview
1.1 Introduction

14
1.0 Overview, Continued
745-573-B0-001 REV. A
EXTERNAL
INDICATOR
LAMPS
GROUND
SKIRT
PADLOCK
HASP
EXTERNAL
INDICATOR
LAMPS
Fig. 1-1, Ground Mount (Front View of 4 battery cabinet with ground skirt)
Fig. 1-2, Pole Mount (Front View of 8 battery cabinet)
1.2 Cabinet Nomenclature

15
745-573-B0-001 REV. A
1.0 Overview, Continued
GROUND
POLE MOUNTING
BRACKET
AC INPUT
CONDUIT
CONNECTION
OPTIONAL LOCATION FOR
"FEED-THRU" ADAPTOR
DISCONNECT BREAKER BOX
COAX SEIZURE CLAMP
"SNAP IN" CONNECTOR
(TO POWER SUPPLY INPUT)
"FEED THRU" ADAPTOR AT
REAR OF BOTTOM SHELF
1.2 Cabinet Nomenclature, continued
Fig. 1-3, Pole Mount (Rear View of cabinet)
Fig. 1-4, Typical Placement of Disconnect Breaker on rear of Cabinet
Fig. 1-5, Coax “Feed Thru”Adapter Normal Location (Bottom Shelf)

16
2.0 Cabinet Installation, continued
745-573-B0-001 REV. A
NOTE: Pole mounting the cabinet should be done in accordance with the local agreement
between the cable operator and the utility company.
NOTE: A bucket truck and other suitable equipment, such as spikes and safety harness,
should be used during installation or service of pole-mounted cabinets. To mount
the Lectro UPS to a utility pole perform the following steps:
INSTALLATION PROCEDURE
1. Install an appropriate disconnect box between the AC power source and the CPRTM cabinet mounting
point. Wire to power line in accordance with local codes.
NOTE: The disconnect box should have a high magnetic type circuit breaker, capable of
passing short duration inrush currents, and have a minimum rating as shown below.
•For 120 VAC 60 Hz units, the service disconnect shall be a high-magnetic type circuit breaker
rated for 20 amperes in the line lead only.
•For 240 VAC 60 Hz units, the service disconnect shall be a 2 pole, high-magnetic type circuit
breaker rated for 15 amperes.
•For 230 VAC 50 Hz units and 220 VAC 60 Hz units, the service disconnect shall be a
high-magnetic type (motor rated type 3 or 4) circuit breaker rated for 16 amperes in the line lead
only.
Fig. 2-1, Pole Mount Installation
2.1 Pole Mounting

17
745-573-B0-001 REV. A
2.0 Cabinet Installation, continued
2. Remove the U-shaped bracket from the cabinet rear panel.
3. Use the bracket as a template to mark mounting holes at the desired mounting location. If possible,
position the cabinet so that the front panel and the external LED’s are easily visible.
NOTE: If attaching to a concrete pole additional mounting hardware will be required for the
installation. Lectro does not provide the metal bands required to mount to a
concrete pole. This hardware can be obtained from a cable TV hardware supplier.
4. Drill 11/16" (17.5mm) holes in the pole at the marked locations.
5. Attach the bracket to the pole using 5/8" (M16-2.0) hardware (not provided). Make sure that the head
of the bolt is next to the pole bracket and the nut is at the rear of the pole. Tighten securely.
6. Raise the cabinet and set into place on the bracket already attached to the pole. The slots on the pole
bracket should be pointing downward so that the cabinet will slide onto the bolts on the pole-
mounting bracket. Attach the cabinet using the hardware provided. Tighten ALL the bolts securely.
7. Confirm the availability of a suitable ground rod at the base of the pole. If required, drive a rod
according to local codes.
8. Refer to Section 2.4 for Electrical Connections.
2.1 Pole Mounting, continued

18
2.0 Cabinet Installation, continued
745-573-B0-001 REV. A
1. Select an appropriate site. Check with other local utilities for buried plant before site location is
finalized. Remove the turf and level an area of approximately 4" greater than the footprint of the
CPRTM cabinet. Refer to Figure 2-2 for details.
2. In accordance with local codes, install the disconnect box near the AC power source.
NOTE: The disconnect box should have a high magnetic type circuit breaker, capable of
passing short duration inrush currents, and have a minimum rating as shown below.
●For 120 VAC 60 Hz units, the service disconnect shall be a high-magnetic type circuit breaker
rated for 20 amperes in the line lead only.
●For 240 VAC 60 Hz units, the service disconnect shall be a 2 pole, high-magnetic type circuit breaker
rated for 15 amperes.
●For 230 VAC 50 Hz units and 220 VAC 60 Hz units, the service disconnect shall be a high-magnetic
type (motor rated type 3 or 4) circuit breaker rated for 16 amperes in the line lead only.
3. From the disconnect box, install conduit to the power supply site and turn a stub up to extend above
grade level. Drive a suitable ground rod according to local codes.
4. Install appropriate size conduit for the output connections and turn a stub up to extend 1" above the
pad surface cast into the concrete. Make sure to match conduit locations with the appropriate cabinet
locations; these locations are indicated in Figure 2-2.
5. Using appropriately sized lumber, construct a form for the cement pad (refer to Figure 2-2 for
dimensions). Anchor the form securely to the ground. If a pre-formed pad is utilized for the mounting
of the CPR cabinet, check the bolt patterns for proper alignment before anchoring the pad to the
ground.
6. Attach the ground mounting brackets from the supplied hardware to the ground skirt using the
5/16”-18 X 3/4” screws and 5/16”-18 nuts. Tighten securely.
7. Make a template from sheet metal or wood indicating the position of the ground-mounting bracket
mounting holes.
INSTALLATION PROCEDURE
Although ground mounting the CPR cabinet can be accomplished by several methods, the following
procedure is recommended:
2.2 Ground Mounting

19
745-573-B0-001 REV. A
2.0 Cabinet Installation, continued
8. Drill out the two holes in the template and insert two 5/8" X 4" (M16-2.0 x 100mm) bolts (not
supplied). The heads of the bolts will be embedded into the concrete pad when installation is
complete. Leave sufficient thread above the pad for securing the ground skirt.
9. Center the template (with holes in position) over the form. Be sure the conduit stub-ups for the AC
input, ground rod, and AC output are positioned at the desired locations just outside the ground skirt.
Optional: The conduit stub-ups may pass through the cement pad as shown below.
10. Pour, level, and finish concrete to the bottom of the template. Allow a curing time of 24 hours.
11. Attach ground skirt to power supply cabinet.Align skirt inside bottom lip of the cabinet and secure
using 10-32 X 3/8" screws from the parts kit.
12. Attach the power supply cabinet to the concrete pad using 5/8" (M16-2.0) nuts (not provided) through
the ground mounting brackets. Tighten all hardware securely.
2.2 Ground Mounting, continued
INSTALLATION PROCEDURE, CONTINUED
Fig. 2-2, Pad Dimensions

20
2.0 Cabinet Installation, continued
745-573-B0-001 REV. A
NOTE: Alpha Technologies recommends using the grounding method illustrated below. The grounding
method for a particular site will be dependant upon soil type, available space, local codes, NEC
(National Electric Code), and other site-specific characteristics. Alpha Technologies recommends
5 ohms minimum ground resistance between enclosure and ground rods, in accordance with
IEEE 1100-1999 “Powering and grounding Electronic Equipment”.
Alpha Technologies assumes no responsibility orliability for failure of the installer to
comply with the requirements of all applicable local and national codes. Where allowed,
exothermic welding may be used as an alternative to Burndy clamps and connectors.
1
Service Grounding (required)
#6 bare copper wire from Service Neutral/Ground Bar with 2 ground rods located 6' apart.
Lightning Protection (optional)
1/2" x 8' Copper ground rod, four places driven about 2 feet (typical) from the corners of the pad.
#6 bare Copper wire loop terminated to each ground rod and buried below grade (30 inches, min.
Corrosion-proof connections (25+ year life-span) and hardware suitable for direct burial MUST be used.
#6 bare Copper wire from loop to enclosure.
2
3
4
Burndy YGHP58C2W-2TN
or Equivalent
Burndy YGHP58C2W-3
or Equivalent
Terminate at
Enclosure Ground Bar
Terminate at
Service Entrance Ground
Two 8' Ground Rods 6' Apart (min)
4
1
2
2'min.
#2 AWG
2
2
2
3
Fig. 2-3, Enclosure Grounding
2.3 Enclosure Grounding