Installation
 DANGER |
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HAZARD OF electric shock, explosion, or arc flash
Failure to follow these instructions will result in death or serious injury.
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Set the environmental controls (thermostat, humidistat, or other items.) to mitigate condensation (including times when the equipment is lightly loaded, such as storage, downstream loads deenergized). Consult the engineer of record for the appropriate environmental control settings.
Standard Components and Parts
The following components and parts are shipped standard with each unit:
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Use caulk to seal cracks found after final installation
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1/2 inch (13 mm) gasket for repair if the unit gasket is damaged during shipment
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One set per shipping section of four 1/2–13 bolts and seal washers for replacing the bolts that hold the lifting lugs on the roof
Single Aisle Installation
Follow the instructions below for single aisle installation of outdoor walk-in switchgear. For common aisle installation, see Common Aisle Installation.
Pre-Installation Procedures
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The switchgear may be shipped in one or more shipping sections. Review the assembly drawings to verify that switchgear sections will be assembled in the correct order.
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Verify that the conduit placement on the foundation is accurate according to customer drawings. Error in conduit placement may prohibit the proper installation of switchgear as described in this section (see the note below).
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Sweep the pad and remove debris before installing any sections.
Installing the Switchgear and Equipment Space Sections
- Install and level the switchgear shipping section. Carefully
align the openings on the bottom of the switchgear sections with conduits
on the foundation before lowering the switchgear into place.NOTE: When more than two shipping sections are involved, carefully measure the conduit spacing, comparing it to the factory order drawings. Cumulative error can be significant enough that it prohibits proper installation. To lessen cumulative error, install the center shipping section first, and work toward either end of the sections.
Preparing to Unload Shipping Sections
- Unload the switchgear shipping sections from the delivery
truck. The shipping sections are designed to be lifted by a crane.
Attach a sling to the lifting lugs on the roof of each of the shipping
sections as shown in . A spreader bar may be necessary to maintain proper lifting angles.
If a crane is not available, contact Schneider Electric for special
arrangements for unloading the switchgear sections.
CAUTIONDAMAGED LIFTING EYESThe interior angle of the lifting sling should not exceed 90°. Angles greater than 90° apply greater inward pressure on the lifting eyes, which can damage and dislodge the lifting eyes from the switchgear.Failure to follow these instructions can result in injury or equipment damage.Unloading a Section
- Remove the shipping covers. Be careful not to damage the instrumentation on the front doors when removing shipping covers.
- Install and level the switchgear shipping section (see Placing First Section). Carefully align the openings on the bottom of the switchgear sections with conduits on the foundation before lowering the switchgear into place.
- Level the switchgear shipping section using steel shims if necessary.
- Verify that the factory-installed gasket attached to one side of the shipping section is in place before installing the subsequent shipping sections. If damaged or missing, repair it using the gasket material provided. Make sure there is no gap between splices if repairs are made.
- Using a crane, install the second switchgear shipping section (see Unloading Second Section).
- Level the switchgear shipping section using steel shims if necessary.
- Verify that the switchgear sections are level, aligned, and fit snugly together. If the sections do not fit properly, lift the most recently placed section by crane, remove any obstructions, and reinstall.
- Secure the second section to the previously installed section with the 3/8-16 x 1.0 carriage bolts located on the front of the switchgear, rear of the switchgear, and across the roof of the switchgear (see Securing Switchgear Sections).
- Install the equipment space sections (see Securing Equipment Space to Switchgear). Equipment space sections are designed similarly to switchgear units and can be unloaded and installed in the same manner.
- After the switchgear and equipment space sections have
been installed, verify that all sections are aligned accurately, and
that the bases and roof lines are level. Use a water level and a straight
edge.NOTE: The floor of the front aisle will be level only if the switchgear is level.
- Secure the equipment space sections to the adjoining switchgear shipping section with the bolts located on the front of the switchgear, rear of the switchgear, and across the roof of the switchgear.
Attaching and Anchoring the Aisle Sections
| CAUTION |
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damaged lifting eyes
The interior angle of the lifting sling should not exceed
90°. Angles greater than 90° apply greater inward pressure
on the lifting eyes, which can damage and dislodge the lifting eyes
from the switchgear.
Failure to follow these instructions can result in injury or equipment damage.
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- Using a crane, install the first aisle section. NOTE: The front aisle is shipped in sections of up to four bay sections. The sections are braced with temporary shipping sheet metal angles, bars, and channels (see Braced Front Aisle Section). Do not remove any of these braces until the shipping sections are in place and bolted to the switchgear section.
Braced Front Aisle Section
- Verify that the vertical sections, the base, and the roof
are aligned with the switchgear shipping sections. Use steel shims
if necessary. It is important that the bolt holes on the aisle roof
support brackets align with the corresponding holes on the front of
switchgear sections.
Aligning Aisle with Switchgear Section
- Attach the aisle section to the switchgear by bolting each bay’s aisle roof support bracket to the front of the switchgear and by bolting the aisle roof to the switchgear roof, using the supplied 3/8-16 x 1.0 inch bolts (Anchoring Aisle Roof Support Bracket to Switchgear).
- Bolt the aisle base to the switchgear base with 3/8–16 x 1.0 inch bolts (Aisle and Switchgear Base Connection). If required, pry the aisle base in place with an alignment bar.
- After the aisle section is in place and attached to the switchgear section, remove the end shipping braces. Do not remove the braces from in front of the switchgear as it may be necessary to lift the aisle section again if it does not align properly.
- Using a crane, set the second aisle section onto the concrete pad approximately 12 inches (305 mm) from the section in place.
- Remove the end braces from the new section and, using a crane, carefully lift the section into place.
- Install, level, and attach the second aisle section to the switchgear by bolting each bay’s aisle roof support bracket to the front of switchgear, and by bolting the aisle roof to the switchgear roof. Use steel shims, if necessary, to make sure there is an alignment.
- Attach the second aisle section to the first aisle section by bolting the aisle roof supports together (see Attaching Second Aisle Section to First Aisle Section).
- Install, level, and attach the second aisle section to the first aisle section by bolting the aisle roof supports together. Use steel shims, if necessary, to make sure there is an alignment.
- Bolt the aisle base to the switchgear base with 3/8-16 x 1.0 inch bolts (Aisle and Switchgear Base Connection). If required, pry the aisle base in place with an alignment bar.
- After all aisle sections are bolted in place, remove the aisle shipping braces in front of the switchgear.
- Mount the aisle roof caps to the roof at each end using the supplied 1/4 inch thread-forming screws. See Roof Cap Installation.
- Mount the switchgear roof cap to the roof at each end using 1/4 inch thread-forming screws, then mount the roof cap to the aisle roof support using two 1/4 inch carriage bolts, seal washers, and locknuts all supplied by Schneider Electric (see Roof Cap Mountings).
- Inspect the walk-in switchgear for any openings that may expose the equipment to rain. To do so, enter the walk-in enclosure, close the doors, and look for any light coming through the joints, mainly in the corners (Checking Enclosure for Openings in the Seal). Make note of them, and seal with caulk. Look mainly for cracks that could be directly exposed to rain.
- Remove the lifting lugs located on the roof of the switchgear
and aisle (Removing Large Lifting Lugs and Removing Small Lifting Lugs). Plug the holes with the 1/2-13 inch bolts and seal washers
(Plugging Holes with Bolts and Seal Washers) furnished with each shipping section. CAUTIONimproper roof installationMake sure all 1/2-13 inch bolts and seal washers are in place; they not only seal, but hold the roof to the switchgear. Refer to Plugging Holes with Bolts and Seal Washers.Failure to follow these instructions can result in injury or equipment damage.
Removing Large Lifting Lugs
Removing Small Lifting Lugs
Plugging Holes with Bolts and Seal Washers
Common Aisle
The same basic guidelines and assembly procedures used for single aisle installation also apply to the common aisle. Refer to the single aisle installation procedures for general information. Specific procedures for common aisle assembly are detailed in this section.
Outdoor Walk-in Switchgear with Common Aisle
The common aisle switchgear is shipped with the “low side” and the “high side” switchgear sections fully assembled and ready to set on a concrete pad. The aisle is shipped in subassemblies.
Common Aisle Installation
- Install the switchgear “high side” shipping section (see Common Aisle Configuration).
- Line up and bolt the bases to the “high side” switchgear.
- Install the switchgear “low side” shipping
section and bolt it to the base (see Common Aisle Configuration).NOTE: The lineup of all switchgear sections and bases must be accurate and square, and the floor must be level. Use shims if necessary.
- Install the roof subassemblies, attaching them to the switchgear sections (see Common Aisle Configuration).
- Add the end panel subassemblies. Use 3/8-16 x 1-1/2 inch carriage bolts to attach them to the side sheet. Use 3/8-16 x 1 inch hex-head bolts to attach the subassemblies to the roof.
- Make sure the gaskets attached to one side of the roof and around all bolted flanges are in place. If damaged, repair them using the factory-supplied 1/2 inch gasket material. Make sure there is no gap between the splices if repaired.
- Attach the roof caps to the aisle and the switchgear roof. CAUTIONimproper roof installationMake sure all 1/2-13 bolts and seal washers are in place; they not only seal, but hold the roof to the switchgear (see Common Aisle Configuration).Failure to follow these instructions can result in injury or equipment damage.
Common Aisle Configuration
- After installation of common aisle outdoor walk-in switchgear, the switchgear base needs to be anchored to the concrete pad or foundation. For non-seismic applications see Equipment Anchorage for Non-Seismic Applications. For seismic applications see Equipment Installation for Seismic Applications.
Equipment Anchorage for Non-Seismic Applications
The switchgear needs to be anchored to the building structure or foundation using mounting plates as shown in Non-seismic Switchgear Anchor Assembly. Mounting plates (supplied by Schneider Electric) are used as friction clips to secure the enclosure base channels to the building structure or foundation. Equipment installations must be anchored using all enclosure tie-down points as shown in Single Aisle Floor Plan: Standard 36 in. (914 mm) Wide Unit (Not for Construction) and Common Aisle Floor Plan: Standard 36 in. (914 mm) Wide Unit (Not for Construction).
Non-seismic Switchgear Anchor Assembly
Equipment Installation for Seismic Applications
Introduction Seismic Certification
Seismic certification is an optional feature on the Masterclad 27 kV MetalClad product line and provides seismic conformance options to any of the North American and International building codes and seismic design standards identified in Table 1. Masterclad 27 kV Metal-Clad that is seismically certified has been certified to the seismic requirements of the listed code per the manufacturer’s certificate of compliance (CoC). Equipment compliance labels and CoC’s are provided with all seismically certified Masterclad 27 kV MetalClad. Refer to the equipment CoC for certification details and applicable seismic parameters. To maintain the validity of this certification, the installation instructions provided in this section must be followed.
List of Supported Regional Building Codes and Seismic Design Standards
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Code Reference ID |
Code Name |
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North American Codes |
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Canada |
NBCC |
National Building Code of Canada |
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Mexico |
CFE MDOC-15 |
Civil Works Design Manual, Earthquake Design |
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United States |
IBC per ASCE 7 |
International Building Code—IBC |
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International Codes |
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Argentina |
INPRES-CIRSOC103 |
Argentinean Standards for Earthquake Resistant Constructions |
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Australia |
AS 1170.4-2007 (R2018) |
Structural design actions, Part 4: Earthquake actions in Australia |
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Chile |
NCh 433.Of1996 |
Earthquake resistant design of buildings |
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China |
GB 50011-2010 (2016) |
Code for Seismic Design of Buildings |
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Colombia |
NSR-10 Título A |
Colombian Regulation of Earthquake Resistant Construction |
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Europe |
Eurocode 8 EN1998-1 |
Design of structures for earthquake resistance – Part 1: General rules, seismic actions and rules for buildings |
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India |
IS 1893 (Part 1) : 2016 |
Criteria for Earthquake Resistant Design of Structures Part 1 General Provisions and Buildings |
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Indonesia |
SNI 1726:2019 |
Earthquake Resistance Planning Procedures for Building and Non-building Structures |
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Japan |
Building Standard Law |
The Building Standard Law of Japan |
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New Zealand |
NZS 1170.5:2004+A1 |
Structural design actions, Part 5: Earthquake actions – New Zealand |
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Peru |
N.T.E. - E.030 |
National Building Code, Earthquake-Resistant Design |
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Russia |
СП 14.13330.2018 |
Building norms and regulations: Construction in seismic regions |
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Saudi Arabia |
SBC 301 |
Saudi Building Code, Loads & Forces Requirements |
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Taiwan |
CPA 2011 |
Seismic Design Code and Commentary for Buildings |
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Turkey |
TBEC-2018 |
Turkey Buildings Earthquake Standard |
Responsibility for Mitigation of Seismic Damage
The Masterclad 27 kV Metal-Clad equipment is considered a nonstructural building component as defined by regional building codes and seismic design standards. Equipment capacity was determined from tri-axial seismic shake-table test results in accordance with the International Code Counsel Evaluation Service (ICC ES) Acceptance Criteria for Seismic Certification by Shake-Table Testing of Nonstructural Components (ICC-ES AC156).
An equipment importance factor, Ip, that is greater than one (Ip > 1.0) is assumed and indicates that equipment functionality is required after a seismic event and after seismic simulation testing. This importance factor is applicable for designated seismic systems (for example, special certification) servicing critical infrastructure and essential buildings where post-earthquake equipment functionality is a requirement.
Incoming and outgoing bus, cable, and conduit must also be considered as related but independent systems. These distribution systems must be designed and restrained to withstand the forces generated by the seismic event without increasing the load transferred to the equipment. For applications where seismic hazard exists, it is preferred that bus, cable, and conduit enter and exit the bottom of the equipment enclosure.
Seismic certification of nonstructural components and equipment by Schneider Electric is just one link in the total chain of responsibility required to maximize the probability that the equipment will be intact and functional after a seismic event. During a seismic event, the equipment must be able to transfer the inertial loads that are created and reacted through the equipment’s force resisting system and anchorage to the load-bearing path of the building structural system or foundation.
Anchorage of equipment (for example, nonstructural supports and attachments) to the primary building structure or foundation is required to validate seismic conformance. The construction site structural engineer or engineer of record (EOR) or the registered design professional (RDP) is responsible for detailing the equipment anchorage requirements for the given installation. The installer and manufacturers of the anchorage system are responsible for assuring that the mounting requirements are met. Schneider Electric is not responsible for the specification and performance of equipment anchorage systems.
Tie-down Points for Rigid Floor Mounted Equipment
Tie-down points for enclosure anchorage to the building structure or foundation require using mounting plates as shown in Switchgear as Tested Anchor Assembly. Mounting plates (supplied by Schneider Electric) are welded to the enclosure base channels and accept anchor attachments to the building structure or foundation. Equipment installations must be anchored using all enclosure tie-down points as shown in Single Aisle Floor Plan: Standard 36 in. (914 mm) Wide Unit (Not for Construction) and Common Aisle Floor Plan: Standard 36 in. (914 mm) Wide Unit (Not for Construction) for outdoor applications.
Welded mounting plates must be properly sized to ensure the weldment withstand capacity exceeds the earthquake demand at location of equipment installation. Precautions shall be made to properly vent and shield the equipment enclosure during the field welding process. Schneider Electric is not responsible for equipment damage caused by field welded mounting plates.
Anchorage Assembly Instructions
The bolted anchor assembly view depicted in Switchgear as Tested Anchor Assembly illustrates the equipment’s as-tested attachment to the seismic shake-table test fixture. The equipment seismic rated capacity, as stated on the Schneider Electric CoC, was achieved with the identified size and grade attachment hardware. For bolted attachments, the use of factory supplied Belleville conical spring washers, are required to maintain seismic conformance. Field installed equipment attachment and support detailing shall be in accordance with the anchorage system requirements as defined by the construction site EOR or RDP.