IntroductionMP Husky is a prominent manufacturer of
cable tray systems, known for its innovative and environmentally friendly products. The company emphasizes customer support, environmental protection, and advanced engineering.
Description and Selection
Cable tray systems provide structural support for cables in various applications. The main types include Ladder, Trough, Center Rail, Wire Basket, and Channel, each designed for specific uses such as power or data communication cables.
Technical Data
The document provides detailed technical data on materials, construction, corrosion resistance, electrical design, and grounding, including specifications for different tray types and their applications.
Materials and Construction
Cable trays are made from corrosion-resistant metals like aluminum and steel. The choice of material depends on economic considerations and installation requirements, such as conductivity and corrosion resistance.
NEMA and CSA Load Classifications
The document outlines NEMA and CSA load classifications, detailing load capacity per foot and support span for various classes, crucial for selecting the appropriate tray for specific applications.
Quality Assurance
MP Husky adheres to high-quality standards like ISO 9001 and NEMA VE-1, and is compliant with nuclear standards, undergoing audits every three years to ensure quality assurance in nuclear applications.
Standards and Certifications
The document lists standards and certifications, including ANSI, ASME, and AWS, ensuring compliance with industry requirements for quality and safety.
Nuclear Program
MP Husky serves over thirty nuclear plants worldwide, being the only cable tray manufacturer compliant with 10CFR50 Appendix B, with regular audits to maintain its quality assurance program.
Conclusion
MP Husky's cable tray systems are engineered to meet diverse industrial needs, backed by rigorous quality standards and a commitment to innovation and customer satisfaction.
Materials & Construction
MP Husky manufactures cable trays using various materials, each with distinct properties and applications. Steel trays are cost-effective and strong but have poor corrosion resistance. Stainless steel offers enhanced corrosion resistance, suitable for high durability environments. Galvannealed steel improves paintability and corrosion resistance. Fiberglass trays are non-conductive and corrosion-resistant, suitable for harsh environments.
Corrosion Resistance
Corrosion in metals is primarily due to electrochemical phenomena. Zinc coatings provide protection, with effectiveness varying based on environmental conditions. Indoor environments generally offer longer protection for zinc coatings compared to outdoor settings.
Finishes
Steel cable trays can be protected from corrosion through metallic coatings. The choice of finish depends on environmental conditions and application requirements.
General Recommendations
For environments prone to galvanic corrosion, selecting metals close together in the galvanic series is advised. Protective coatings or galvanization can help protect steel. Aluminum alloys benefit from a self-healing oxide film that provides corrosion resistance.
Corrosion Resistance of Aluminum
Aluminum's corrosion resistance is due to its oxide film. Problems in aluminum installations are rare and usually due to incorrect alloy choice or exposure conditions. The 6000 series alloys are noted for good resistance in industrial and marine environments.
Steel with Zinc Coatings
Zinc coatings on steel show a linear corrosion rate in various atmospheres, with longevity proportional to thickness.
Loading Guidelines for Cable Tray Systems
Design conditions consider weather factors, load types, and maximum allowable stresses. Loads are categorized into dead, live, and dynamic loads, with additional subdivisions for practical load classification.
Weather-Related Loadings
The National Electrical Safety Code recognizes three degrees of loading due to weather: heavy, medium, and light. Modifications are necessary for cable tray systems concerning ice, snow, and wind loadings.
Design Loadings and Application
Design loadings for cable trays are based on maximum allowable stress and vary with span, type, and width of the tray. Load tables provide guidance for standard supports.
Dynamic and Inertia Loads
Dynamic loads result from motion, such as cables being dropped. Inertia loads occur when the structure is in motion, requiring special design considerations.
Wind Pressure Specifications
Class 1 and Class 2 loading specifications are similar to Class 3, which requires a lateral, horizontal wind pressure of 25.6 lbs. per square foot on a 4-inch deep tray without ice-coating.
Deflection in Cable Tray Systems
Limiting deflection in cable tray systems is important for aesthetic reasons. Methods to decrease deflection include decreasing stress by reducing the bending moment and increasing the depth of the tray.
Grounding and Electrical Safety
Grounding is crucial for safety, protecting against faults caused by electrical disturbances. Effective grounding should be permanent, continuous, and have low impedance.
Electrical Properties and Fault Current Division
The document discusses the electrical design of cable trays, emphasizing the need for high current carrying capacity during faults.
Sizing Trays for Multiple-Conductor Cables
Guidelines for installing multiple-conductor cables in various tray types are provided, ensuring the total diameter of cables does not exceed the tray width.
Specifications
The document outlines specifications for cable trays, focusing on the cross-sectional area limits for different types of trays.
Sizing Procedures
Detailed procedures for sizing cable trays for single conductor cables are provided, including calculations and examples.
Load and Deflection Calculations
Formulas are provided for calculating deflection for loads smaller than those shown in load deflection tables.
Selection and Loading Tables
The document includes selection tables for different NEMA classes and materials, detailing load capacities and dimensions for aluminum and steel trays.
Additional Technical Data
Information on safety factors, rung options, and standard dimensions for fittings and splice plates is included.
Overview
This document is a technical guide from MP Husky, detailing specifications, procedures, and standards for cable trays, specifically focusing on I-Beam and Husky Trough designs.
Specifications
The document outlines different NEMA classes for cable trays, specifying load capacities, tray heights, load depths, and top flange widths.
Procedures
The document includes a numbering system for identifying tray types, materials, rung spacing, and dimensions.
Standards
The document adheres to NEMA standards, specifying classes such as 12A, 12B, 12C, 20A, 20B, 20C, 24B+, and 24C+.
Recommendations
MP Husky recommends using I-Beam style trays for customers preferring this design or for expanding existing installations.
Loading Tables
Detailed loading tables are provided for various spans and widths, indicating load limits and safety factors.
Key Data from Tables
The tables provide load capacities in pounds per foot for different spans and widths.
Conclusion
This document serves as a comprehensive guide for selecting and configuring cable trays, ensuring compliance with NEMA standards.
Overview
The document provides technical specifications and data for MP Husky's aluminum ventilated and solid bottom cable trays.
Specifications- Depth: Nominal depths of 4-1/2, 6, 7, 8, and 10 inches.
- Widths: Available in 6, 9, 12, 18, 24, 30, and 36 inches.
- Lengths: Standard lengths include 10' (120"), 12' (144"), 20' (240"), and 24' (288").
- Materials: Primarily aluminum, with options for solid or ventilated bottoms.
- Tray Types: Includes JA, JB, MB1, MC, YA2, XA, X, X1, X7, X71, L1, D1.
Procedures- Assembly of part numbers uses a color-coding system to denote specific features such as corrugated bottoms and rung spacing.
Standards and Safety- Safety Factor: 1.5 NEMA Standard.
- Compliance with NEMA and CSA standards for various tray types.
Loading Tables- Tables provide load capacities for different spans and widths, with specific notes on corrugated bottoms and rung spacing.
Recommendations- For the most current data, users are advised to visit the MP Husky website.
Overview
The document provides detailed technical specifications and guidelines for Husky EMI (Electromagnetic Interference) Enclosures, designed to protect control and instrumentation cables from electromagnetic and electrostatic interference in industrial settings.
Specifications- The EMI enclosures are designed to shield low-level control circuits from interference over a frequency range of 60 Hz to 100 kHz.
- Materials used include ASTM A653-G90 Steel, with all enclosures being hot-dip mill galvanized.
- Minimum electrostatic attenuation is specified at 86 dB, and electromagnetic attenuation ranges from 9 dB to 55 dB.
Procedures- Installation involves clamping the enclosure to support structures and using a wrap-around splice for joining sections.
Standards and Certification- The manufacturer must certify that the enclosures meet specified shielding efficiencies, supported by evaluation tests and technical data.
Recommendations- Use twisted parallel pairs that are shielded and grounded.
Key Data from Tables- Loading tables provide span and width specifications for various cable tray configurations, indicating load capacities and attenuation values.
Conclusion
Husky EMI enclosures offer a cost-effective solution for protecting control cables from interference, facilitating easy installation and maintenance while ensuring compliance with industry standards.
Specifications and Standards
The document outlines the specifications for hot-dip galvanizing protective coverings, which must conform to ASTM Standards.
Approval of EMI Enclosure
The contractor is required to submit a complete schedule of materials and equipment for approval within thirty days after the contract award.
Material and Technical Data
The cable trays are made from ASTM-A653 G90 Steel with a standard finish.
Installation Guidelines
Guidelines for installation include the use of standard self-drilling sheet metal screws and optional holding devices like banding and clamps.
Fittings and Numbering System
The document details the numbering system for various fittings, including horizontal and vertical bends, crosses, and tees.
Safety and Compliance
All channels have a safety factor of 1.5 as per NEMA standards.
Overview
This document provides detailed specifications and installation guidelines for MP Husky cable tray systems, including various accessories and support materials.
Specifications
The document outlines the specifications for different types of cable trays and accessories.
Procedures
Installation procedures for mid-span splices and hold down clips are provided.
Standards and Recommendations
The document references NEMA VE-2 for expansion guide recommendations.
Accessories
A variety of accessories are detailed, including single and double hold down clips, expansion guides, hanger clips, and trapeze support kits.
Support Materials
The document lists support materials such as hanger rods, suspension channels, and beam clamps.
Key Data from Tables
The tables provide catalog numbers, material types, and dimensions for each accessory and support component.
Critical Information
The document emphasizes the importance of using the correct hardware and following installation guidelines to ensure the safety and reliability of the cable tray systems.
Overview
This document is a technical catalog detailing various support materials and components for cable trays, including clamps, hangers, brackets, and covers.
Beam C-Clamps
These are used for supporting hanger rods on I-beams and wide flange beam sections.
I-Beam Clamps with Swivel
These clamps come with a hook bolt and swivel clevis, available in plated steel and SS 316.
Vertical Hangers
Designed for supporting vertical ladders or troughs, these hangers come with necessary mounting hardware.
Channel Clamps
Suitable for American Standard channels with a flange width of 3-1/4” or less.
Vertical Run Supports
These supports vary based on load, spacing, and distance from the wall.
Wall Brackets
Various types of wall brackets are available for supporting trays and channels.
Medium and Heavy Weight Brackets
These brackets are used for supporting multiple ladders or long spans.
Single and Double Strut Brackets
Designed for use with strut framing, these brackets support different tray widths and loads.
Covers
The catalog includes a variety of covers to protect cables from environmental elements.
Overview
This document provides detailed specifications and descriptions of various components and accessories used in wire basket systems.
Specifications- Bolt-Nut Set: Consists of BF Bolt and BF Nut, shipped in quantities of 100.
- Bolt-Staple Set: Includes BF Bolt Set and BF Staple, shipped in quantities of 100.
- SSC Hold Down: Used for creating adjustable fittings or as a center hanger support.
- Simple SL: Used to mount wire baskets to walls.
Procedures- Assembly Instructions: Details the number of accessories required for different widths of wire baskets.
Recommendations- Zinc Rich Paint: Recommended for coating field cut ends to protect against corrosion.
Key Components- Drop-Out Plate: No hardware required for securing to wire basket.
- Multi Union Joint: Used for field fabrication of fittings.
- Vertical Splice Plates: Requires two plates for creating vertical fittings.
Support and Grounding- Wall Support: Attached using two Bolt-Staple Sets.
- Trapeze Hangers: Designed for use with 1/4” threaded rod.
- Raised Floor Supports: Used to raise wire baskets off the floor.
Additional Notes- All components are available in different finishes, including EZ and HDGAF.
Specifications
The document outlines the specifications for the Husky Wire Mesh Cable Support System, specifically the BF2R and BFR Series.
Assembly Instructions
The assembly instructions detail the required accessories for different tray widths.
Technical Information
The Husky Centray system is highlighted for its center-supported cable trays made from 6063-T6 high-strength aluminum.
Advantages
The Husky Centray system offers several advantages, including reduced installation costs and easy access for cable loading and inspection.
Connectors and Couplings
The document lists various connectors and couplings available for the Husky Centray system.
Overview
The document provides detailed specifications and guidelines for MP Husky's cable tray systems, focusing on various components, installation procedures, and material properties.
Specifications
The document lists part numbers and dimensions for various components such as vertical hinge connectors, stabilizer bars, wall mounts, and rail end caps.
Components and Accessories
Includes details on wall brackets, barrier strips, rung caps, and grounding straps.
Material Properties
MP Husky's fiberglass cable trays are made from glass fiber-reinforced plastic, offering non-conductive, non-magnetic, and corrosion-resistant properties.
Installation Guidelines
Installation should comply with NEMA VE-2 standards and the National Electrical Code.
Corrosion Guide
Provides a comprehensive list of chemical environments and their compatibility with polyester and vinylester resin systems.
Load and Temperature Data
Includes load capacity comparisons with steel and the effects of temperature on material strength.
Ordering Information
Instructions on how to order cable trays, including series, material, rung spacing, width, and length specifications.
Overview
The document provides detailed specifications and descriptions for various cable tray systems and components manufactured by MP Husky.
1. Specifications- Cable tray systems are designed to avoid damage to cable insulation with no burrs or sharp edges.
- Fittings have the same load capacity as straight sections and are available in various radii.
- Tray sections are available in lengths of 10, 12, 20, 24, or 30 feet.
2. Material and Construction- Longitudinal members are made from extruded aluminum or galvanized steel.
- Transverse members are designed to prevent moisture collection.
3. Splice Joints- Splice connections must not exceed 330 microhms resistance.
- Splice connectors are high-pressure bolted with a minimum of four bolts per connector.
4. Load and Safety- Husky trays have a load safety factor of 1.5 based on destruction load.
- Trays are labeled with cross-sectional area and load capacity to ensure system adequacy.
5. Manufacturing Standards- Trays are manufactured in accordance with NEMA VE1 standards.
6. Additional Components- Details on various fittings, clamps, and hangers are provided.
7. Husky Techtray and Fiberglass Tray- Wire mesh trays are designed for ventilation and heat dissipation.
- Fiberglass trays meet NEMA FG-1 standards.
8. Husky Centray- Manufactured from high-strength aluminum, with specific design features for enhanced performance.
Specifications Overview
The document outlines the specifications for cable trays and bus systems manufactured by MP Husky.
1. Cable Tray Specifications- Dimensions: The spine and rungs have specified minimum thicknesses and dimensions.
- Construction: The spine is punched to minimize distortion.
- Wall Mount Trays: These trays are mounted with spacers to accommodate wall irregularities.
- Widths: Measurements are taken inside the rungs.
- Manufacturing Standards: Trays must be manufactured by a NEMA member.
2. General Cable Tray System Requirements- Design: Systems must be free of burrs and sharp edges.
- Fittings: Must have the same load capacity as straight sections.
- Material: Options include aluminum, galvannealed steel, and stainless steel.
- Splice Joints: Resistance should not exceed 330 microhms.
3. Cable Bus System Specifications- General Requirements: Suitable for indoor or outdoor use.
- Construction: Made from aluminum alloy 6063-T6.
- Electrical Specifications: Conductors must have insulation rated for 90°C.
- Current Rating: The bus enclosure must have a continuous current rating of at least 1,000 amperes.