Quick Tray Application Guide · QT2X2 251 251 QT2X4 4 102 2 51 QT2X6 6 152 2 51 QT2X8 8 203 2 51 QT2X12 12 305 2 51 QT2X16 16 406 2 51 QT2X18 18 457 2 51 QT2X20 20 508 2 51 QT2X24

®

Quick Tray Application Guide

Data subject to change without notice ☎ 763 422 2211 • FAX 763 422 2600 • www.hoffmanonline.com © 2004 Hoffman Enclosures Inc.

Quick Tray Wire Mesh Cable TrayApplication Guide

1

Table of Contents

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Quick Tray Wire Mesh Cable Tray

Bolt Cutter and Connectors

Cutting the Cable Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Creating a 90 Degree Bend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Creating a Large Radius Bend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Creating an Elbow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Creating a 90 Degree Tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Creating a Y Junction Tee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Reducing Quick Tray Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Changing Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Quick Tray Fill and Load Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . .16

National Electrical Code References . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Quick Tray Catalog Number Reference Guide . . . . . . . . . . . . . . . . . . . .20

ComponentsQuick Tray Wire Mesh Cable Tray

2 Data subject to change without notice ☎ 763 422 2211 • FAX 763 422 2600 • www.hoffmanonline.com © 2004 Hoffman Enclosures Inc.

Catalog Width DepthNumber in. mm in. mm

QT2X2 2 51 2 51

QT2X4 4 102 2 51

QT2X6 6 152 2 51

QT2X8 8 203 2 51

QT2X12 12 305 2 51

QT2X16 16 406 2 51

QT2X18 18 457 2 51

QT2X20 20 508 2 51

QT2X24 24 610 2 51

QT4X4 4 102 4 102

QT4X8 8 203 4 102

QT4X12 12 305 4 102

QT4X16 16 406 4 102

QT4X18 18 457 4 102

QT4X20 20 508 4 102

QT4X24 24 610 4 102

The Quick Tray Wire Mesh Cable Tray comes in straight 10 ft. sections that are easily modfied and combinedto fit almost any configuration.

• Smooth, round wires minimize dust buildup and cable snagging.

• Zinc plating resists corrosion.

• Large 2 x 4 in. (51 x 102mm) mesh allows cable to be routed into and out of the tray at any pointwithout cutting the tray

• Available with either 2 or 4 in (51 or 102mm) sidewalls to hold cable in the tray and in a variety ofwidths to accommodate different numbers of cables

Different cable tray sizes can be joined using the techniques described in this manual to make a truly custominstallation using standard parts.

Splice Bars

Splice Bars provideextra support andstability to traysides whenconnecting traysections with splicewashers. Universalbars can be cut tofit with bolt cuttersand bent for use intees and elbows. Made of zinc-coated steel. RequiresQTSSW1 1 in. (25mm) Square Splice Washers and QTBN1Screws and Flange Nuts to fasten to side of tray.

ComponentsBolt Cutter and Connectors

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Data subject to change without notice ☎ 763 422 2211 • FAX 763 422 2600 • www.hoffmanonline.com © 2004 Hoffman Enclosures Inc

Splice Washers

Splice Washers are usedwith QTBN1 screws andflange nuts for boltingturns, bends, and tees;connecting tray sections;and fastening splice bars.

Catalog Pkg.Number Description Qty.QTBN1 1/4 in. round head screws with flange nuts 50

QTSSW1 1 in. (25mm) square splice washer 50

QTSSW2 1 1/2 in. (38mm) square splice washer 50

QTSSW3 2 in. (51mm) square splice washer 25

Splice Plate andConnection Tool

Splice Plate quicklyconnects traysections. Made ofzinc-coated steel.Requires specialinstallation tool,included with eachpackage andavailable separately.

Catalog Pkg.Number Description Qty.QTFS Splice Platea 50

QTFST Splice Plate Connection Tool 1

a Includes one QTFST Splice Plate Connection Tool

Catalog Pkg.Number Description Qty.QTTS T Connection Splice Bar 50

QTUS10 10 in. (254mm) Universal Splice Bar 50

QTUS43 43 in. (1092mm) Universal Splice Bar 1

Bolt Cutter

Sturdy side action bolt cutter is specially designed toprovide a flush cut and help create a protective coating forthe new cut.

CatalogNumber DescriptionQTBC Side Action Bolt Cutter

Connectors

Cutting the Tray


Always use the Hoffman side action bolt cutter to cut the Quick Tray Wire Mesh Cable Tray.This cutter allows precision cuts that minimize sharp edges that could snag wire. Its actionalso helps to protect the new cut from corrosion.

Decide which wires must be cutWhen cutting for a bend, always review the cutting patternfor the tray size and desired bend before cutting. Red areason the drawings should be removed.

Cut the first side wireStarting with the top side wire, position the cutting jaws onthe cradle wire. Make the cut at an angle away from thenew end.

Cutting the Tray

5Data subject to change without notice ☎ 763 422 2211 • FAX 763 422 2600 • www.hoffmanonline.com © 2004 Hoffman Enclosures Inc

Cut the remaining side wiresCut the remaining side wires, remembering to rest thecutting jaws on the cradle wire and cut at an angle awayfrom the new end.

Make one clean cut to eliminate grinding or touch-up.

Cut the bottom wiresTurn the tray over and cut the bottom wires from theunderside.Always rest the cutting jaws on the cradle wireand cut at an angle away from the new end.

Make one clean cut to eliminate grinding or touch-up.

That’s it!

The cable tray is now ready for installation or forbending to the desired shape.

Cut from the outside wiresto the inside

Creating a 90° Bend


At the desired bend location, cut the wires shown in red for the width of the cable tray.

Cut the side, then the bottom wiresCut all the side wires at the bend location for the tray size.

Creating a 90° Bend


Bend the cable trayTurn the tray on the uncut side. Smoothly bend the tray upuntil the inside edges closest to the uncut side meet.Thebend radius should be 5 in. (120mm).The table shows theouter bend size for selected sizes.

2 in./51mm

4 in./102mm

6 to 24 in./152 to610mm

Secure the bendFasten at the location shown with QTBN1 screws andflange nuts and the splice washers indicated for the tray width.

Width of Tray Sizein. mm in. mm

4 102 15 375

6 152 17 430

8 203 17 430

12 305 21 530

18 457 25 630

24 610 29 730

Creating a Large Radius Bend


Large radius bends are formed by removing the outside and bottom wires at the bend location.

Cut the side and bottom wiresRemove the wires from the outside and the bottom ofevery other mesh section at the location of the bend.Follow the cutting pattern shown for the size tray.

Creating a Large Radius Bend


Bend the cable trayLay the tray on a flat surface and pull the ends on theuncut side towards each other until the remaining cut sidesalmost touch at the corners.

Assemble the bendsFasten the inside of the bends together with the hardwareshown in the drawings and in the table.A and B assemblies,where used, can be in any sequence on the inside of thebend.

Width of Tray Assembly Qty. Radius Sizein. mm A B in. mm in. mm

4 102 0 3 9 229 20 508

6 152 0 4 11 279 26 660

8 203 2 2 11 279 26 660

12 305 4 2 17 432 35 889

16 406 6 2 18 457 42 1067

18 457 9 0 28 711 51 1295

20 508 0 9 28 711 51 1295

24 610 1 10 28 711 54 1372

2 in./51mm

4 to 24 in./102 to 610mm

Creating an Elbow


Two cable trays can be joined to create elbows at various angles.

Cut side wires from each trayFollow the cutting pattern for the tray width, removing theportions shown in red.

16 in./406mm

4 in./102mm

6 in./152mm

8 in./203mm

12 in./203mm

18 in./457mm

20 in./508mm

24 in./610mm

Creating an Elbow


Align the wires of the two trays at thedesired angleFasten the tray as shown. Use two QTBN1 screws andflange nuts and the splice washers indicated for the traysize for each joint.

To form an adjustable angle, use one QTBN1 screw andflange nut and the splice washers indicated for the traysize, centered as shown under Adjustable Elbows. Be sureeach splice washer is over two tray bottom wires.

Tray Width4 in./102mm

Tray Width6 in./152mm

AdjustableElbows

Tray Width8 to 18 in./203 to 457mm

Creating a 90° Tee


The T-connection splice bar connects the two sections of Quick Tray Wire Mesh Cable Tray to form a 90° tee.

Cut the side wiresCut the side wires from the tray forming the top of the teeas shown in the cutting guide for the size tray.

Connect the cable traysUse two 10 in. Universal Splice Bars, bent in the middle to90°, or two T Connection Splice Bars to connect the trays.If using T Connection Splice Bars, always put the long sideparallel to the widest tray, or the one planned to carry theheaviest load.

Universal Splice Bars

T Connection Splice Bars

Creating a Y-Junction Tee


The Y-Junction tee requires cutting both sections of Quick Tray Wire Mesh Cable Tray.

Bend side wires to 45°

Connect the tray sectionsForm the Y by connecting the side wires of the two traysas shown.The universal connectors must be cut to 3 in.

Also connect the trays with splice washers and QTBN1screws and flange nuts. Use one on 4 and 6 in. trays, twoon 8 and 12 in. trays, and three on 16 in. and wider trays.

Cut both tray sectionsCut and remove the wiresindicated for the size tray.

Reducing Quick Tray Width


Reduce Quick Tray Wire Mesh Cable Tray width to connect to smaller tray by cutting side and bottom wires.

Cut the side and bottom wiresCut the wires shown in the cutting guides to make a fourinch or eight inch reduction in tray width.

Connect the uncut side of the traysUse a QTUS10 Universal Splice Bar with fasteners shown.

Bend the cut wires of each trayUse a QTUS10 Universal Splice Bar with fasteners oneach pair of tray wires.

4 in./102mmReduction

8 in./203mmReduction

Changing Levels


Quick Tray Wire Mesh Cable Tray is easily formed to go around obstacles by removing side wires and bendingto the desired angle.

Remove side wire sectionsRemove every other side wire section at the bend locationfrom both sides of the tray.The number of side wiresections removed determines the radius of the bend.

Bend the trayBend the tray smoothly up or down to go around theobstruction.


Quick Tray Fill and Load Calculations

CAT Cab Type (4 pair), .19 in. diameter, 20 lb/kft CAT Cab Type (6 pair), .26 in. diameter, 40 lb/kftCatalog Height Width Area No. Cables Load No. Cables LoadNumber in. in. in.2 at 50% Fill lbf/lineal ft at 50% Fill lbf/lineal ft

QT2X2 2 1.75 3.5 62 1.24 32 1.28

QT2X4 2 3.75 7.5 133 2.66 70 2.8

QT2X6 2 5.5 11 195 3.9 103 4.12

QT2X8 2 7.5 15 266 5.32 141 5.64

QT2X12 2 11.5 23 408 8.16 216 8.64

QT2X16 2 15.5 31 550 11 291 11.64

QT2X18 2 17.5 35 621 12.42 329 13.16

QT2X20 2 19.5 39 692 13.84 367 14.68

QT2X24 2 23.5 47 834 16.68 442 17.68

QT4X4 4 3.75 15 266 5.32 141 5.64

QT4X8 4 7.5 30 532 10.64 282 11.28

QT4X12 4 11.5 46 816 16.32 433 17.32

QT4X16 4 15.5 62 1100 22 583 23.32

QT4X18 4 17.5 70 1242 24.84 659 26.36

QT4X20 4 19.5 78 1384 27.68 734 29.36

QT4X24 4 23.5 94 1668 33.36 885 35.4

The folllowing tables and formulas are provided to help determine how many cables can be safely carried byeach size wire mesh cable tray tray and to determine the appropriate distance between supports for the load,based on number of cables, cable tray size, and bracket type.

Wire Mesh Cable Tray Fill Ratio

Fill ratio = Cross section of cableCross section of tray

According to NEC 392.9 (B), when using ventilated traywith multiconductor control cable, the sum of the cross-sectional areas shall not exceed 50 percent of the interiorcross section of the tray.

The Quick Tray Wire Mesh Cable Tray Fill Table belowshows the number of cables and the load in lbf/lineal footdeveloped by typical 4 pair and 6 pair cable weighing 20lb/kft and 40 lb/kft, respectively.While this table is a useful guide, actual loads must be calculated using the cable specified.

Quick Tray Wire Mesh Cable Tray Fill Table at 50% Fill

Use the following formula to calculate the number ofcables that will result in a particular fill ratio, where:

A = Inside tray area, in in.2

D = Cable diameter, in inches

F = Fill ratio in %

N = Number of cables

The formula is

N = ( F ) * ( A )100 [(D/2)2 * Π]

EXAMPLE:

The installation will use CAT cable at .19 in. diameter, 20 lbper 1000 ft2.The desired fill ratio is 40%.The wire meshcable tray tray is 2 in. (51mm) high by 2 in. (51mm) wide.

A = 3.5 in.2

D = .19 in.

F = 40%

N = ( 40 ) * ( 3.5 ) = 49 cables100 [(.19/2)2 * Π]

Load/foot = 49 cables * 20 lb = 0.98 lb/ft1000 ft.


Catalog Bracket Width Max. LoadNumber Description in. mm lbs

QTCB4 C Bracket 4 102 259



QTLB4 L Bracket 4 102 259



QTTH Trapeze Hanging Clips – – 216

Support Maximum Load

Quick Tray Fill and Load Calculations

anchor must be evaluated separately. Supports should beplaced within 24 in. (610mm) of a splice on straightsections, and the span between supports should not exceedthe length of tray.Additional supports will be requiredaround bends and when the cable tray level changes.

The load ratings of the hardware that supports the QuickTray Wire Mesh Cable Tray must also be considered. Loadratings for some commonly used supports are shown in theSupport Maximum Load table below.

Once the load/foot has been determined, the weight oneach support can be determined by multiplying theload/foot by the number of feet between supports.

EXAMPLE:

Weight of span = Load/foot * No. ft between supports

Load/foot figure from the 2 x 2 in. cable tray with 40% fillratio example: .98 lb/ft

Weight of span = .98 * 5 = 4.9 lb

Weight on support = weight of span / 2

Cable Tray Maximum Load in lb/ft According to SpanCatalog Number 5 ft 6 ft 7 ft 8 ft 9 ft 10 ftQT2X2 17.17 12.54 7.51 6.04 4.77 3.86

QT2X4 18.10 14.00 11.30 9.30 7.40 5.10

QT2X6 25.10 19.80 16.00 13.40 11.00 9.00

QT2X8 25.10 19.80 16.00 13.40 11.00 9.00

QT2X12 36.00 27.70 22.10 18.10 14.60 10.50

QT2X18 65.00 45.50 33.80 26.10 19.40 15.00

QT2X20 65.00 45.50 33.80 26.10 19.40 15.00

QT2X24 67.00 48.70 37.80 30.30 23.70 17.00

QT4X8 43.80 35.90 30.10 25.40 21.20 17.00

QT4X12 57.95 43.77 27.77 22.94 18.12 14.68

QT4X20 89.80 71.00 57.70 47.60 38.50 22.00

QT4X24 89.80 71.00 57.70 47.60 38.50 22.00

Supporting Quick Tray Wire Mesh Cable TrayThe Quick Tray Wire Mesh Cable Tray is sized based onthe number and type of cables required for the currentand future need.A 50% fill ratio should equal the maximumnumber of cables pulled in a given cross section. Straightsection supports installed at 5-foot (1.5m) centers aretypical. For support spans greater than 5 feet (1.5m), cableloads must be evaluated to ensure that the span betweenthe supports is suitable for the load.The support and

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National Electrical Code References


UL Grounding RequirementsAll Quick Tray Wire Mesh CableTrays are UL classified withregard to suitability for use as an Equipment GroundingConductor (EGC). Compliance with other appropriateNEC cable articles is required.The Cable Tray Institute(CTI) recommends compliance with National ElectricalManufacturers, NEMA, Standards Publications Nos.VE1 andVE2, and with the manufacturer's recommendations.

All Quick Tray Wire Mesh CableTray systems mustbe grounded [392.7(A)]. This is true whether or notthe tray is being used as an equipment ground.There aremany ways to meet this requirement.The most effectivemethod is to treat the tray as if it were an equipmentground, meaning that the whole system is continuouslybonded. However, the general requirement only calls foreach section to be grounded.

In order to be used as an equipment ground, severalrequirements must be met [392.7(B)]. First, the systemmust be bonded: where two sections meet, the connectionshould be solidly connected by an approved means, that is,a bolted connection.Additionally, supervision must ensurethat only qualified personnel service the cable tray system[392.3(C)].

Therefore, when using Quick Tray Wire Mesh CableTray asan equipment grounding conductor, maintain continuousgrounding by using the tray in conjunction with "nut andbolt" and steel splices as shown below.

2002 NEC Cable RequirementsThe types of cables permitted by the 2002 NEC areindicated in Table 392.3 (A), Uses Permitted, WiringMethods.They include:

• Power and Control Tray Cable (Type TC) - NEC Article 340

• Power Limited Tray Cable (Type PLTC) - NEC Sections725-61 and 725-71

• Instrument Tray Cable (Type ITC) - NEC Article 727

• Optical Fiber Cables - Article 770

• Fire Alarm Circuit Conductors - Article 760

• Communication Cables - Article 800

• Mineral Insulated (MI) Cable - Article 333

• Metal Clad (MC) Cable - Article 334

Other cables, particularly those specially approved forinstallation in cable trays, may also be permitted. Mediumvoltage (type MV) and single conductor cables in sizes 1/0and larger are permitted, with some restrictions, inindustrial establishments where qualified persons servicethe installation.

National Electrical Code References


Additional Options for Grounding • Use a single conductor cable as the common EGC for allthe circuits in the cable tray [NEC Section 392-3(b)(1)Exception 2].

• Use individual EGC conductors in each multiconductorcable in the cable tray (NEC Section 250-95).

Walking on Cable TraysWalking on cable trays must not be permitted. It violatesthe new version of NEMA standard VE-2, manufacturers'marking and recommendations, and the intent of the NFPA70 Electrical Safety in Employee Work Practices.Walking onelectrical equipment, conduits, cables or other electricalsystems should also be avoided. In addition to the fallhazard, there is the risk of damage to equipment andpossible contact with conductors.

High Voltage CablesHigh voltage cables can be installed in Quick Tray WireMesh CableTray. NEC permits type MC (Article 334) andtype MV (Article 326) in industrial establishments wherequalified persons will service the installation.Multiconductor cables rated over 600 volts must beseparated from lower voltage cables by a separate cabletray or a solid fixed barrier.Type MC cables can be mixedwith lower voltage cables. See NEC 392-6(f).

Instrumentation, Signal, andTelecommunications CablesInstrumentation, signal, and telecommunications cablingshould be separated from power cabling, both to meet NECrequirements and to avoid noise and electromagnetic pick-up from adjacent power cables.This can be accomplished bya separate cable tray system or by a divider within a cabletray.The requirements for cables that have an outer metalarmor are less stringent than for plastic jacketed cables.Thegeneral rule is to separate communication, control, signal,and instrumentation cabling from power cabling. Powercabling includes 460 volt motor power, 120 volt power, andlighting circuits. Note that 120 volt circuits can generatenoise. Generally, a separation of two inches (51mm) isminimum, but the individual circuit and cable are thedetermining factors in separation requirements.

National Electrical Code Uses Permitted Article 392.3A

Cable Type ArticleArmored Cable 320

Communications Raceway 800

Electrical Metallic Tubing 358

Electrical Nonmetallic Tubing 362

Fire Alarm Cables 760

Flexible Metal Conduit 348

Flexible Metal Tubing 360

Instrumentation Tray Cable 727

Liquid-tight Flexible Metal Conduit 350

Liquid-tight Flexible Nonmetallic Conduit 350

Metal-clad Cable 330

Mineral-insulated, Metal-sheathed Cable 332

Multiconductor Service Entrance Cable 338

Multiconductor Underground Feeder and Branch Circuit Cable 340

Multipurpose and Communications Cables 800

Nonmetallic Sheathed Cable 334

Power and Control Tray Cable 336

Power-limited Tray Cablesa –

Optical Fiber Cables 770

aSections 725-61 (c) and 721-71 (f).

Quick Tray Catalog NumberReference Guide


For your convenience when orderingCatalog Number Description Quantity Unit Price Total PriceQT2X2 2 in. x 2 in. electro zinc cable tray straight section

QT2X4 2 in. x 4 in. electro zinc cable tray straight section






QT2x20 2 in. x 20 in. electro zinc cable tray straight section









Cable Tray Straight Section

Splicing Hardware

Hanging Supports

For your convenience when orderingCatalog Number Description Quantity Unit Price Total PriceQTTH Bag of 50 Trapeze Hanging Clips, Hex nuts required,

1/4 in. to 3/8 in.

QTTM 39 in. Trapeze Mount. Use with L bracket or 2 threaded rods

QTCB4 4 in. C Bracket



QTSS Suspension Shoe (for use with CAT 30)

QTSHSB Bag of 50 Single Hanger Suspension Brackets for 1/4 in. threaded rods,hex nuts required (for use with CS profiles only)

QTQHA Bag of 50 Quick Hanging Accessories for CS Brackets

QTCH12 12 in. Center Hanger

QTCH24 24 in. Center Hanger

QTLB16 16 in. L Hanger



For your convenience when orderingCatalog Number Description Quantity Unit Price Total PriceQTSSW1 Bag of 50, 1 in. Square Splice Washers

QTSSW2 Bag of 50, 1-1/2 in. Square Splice Washers

QTSSW3 Bag of 25, 2 in. Square Splice Washers

QTBN1 Bag of 50, 1/4 in. Round Head Screws with Flange Nuts

QTFS Bag of 50, Fast Splice Plates; one tool included per bag

QTFST Tool for Fast Splice Plate connection

QTTS Bag of 50 T Connection Splice Bars

QTUS10 Bag of 50, 10 in. Universal Splice Bars

QTUS43 43 in. Universal Splice Bar

To create a bill of materials (BOM) for a cable tray system, determine the number and cross-section of trays,as well as the type and number of splices, supports, and accessories.

Quick Tray Catalog NumberReference Guide


For your convenience when orderingCatalog Number Description Quantity Unit Price Total PriceQTWMA Wall Mount Attachment

QTSIWS Snap-In Wall Hanger Support

QTLB4 4 in. L Bracket



QTRWB4 4 in. Reinforced Wall Bracket







Wall Supports

Under Floor Supports

Accessories

For your convenience when orderingCatalog Number Description Quantity Unit Price Total PriceQTUFC Under Floor Support Clamp

QTUFS 2.5 in. High Under Floor Support

QTUFS6X8 6 in. High x 8 in. Long Under Floor Support

For your convenience when orderingCatalog Number Description Quantity Unit Price Total PriceQTDS2 2 in. Divider Strip

QTDS4 4 in. Divider Strip

QTBC Bolt Cutter

QTDO 12 in. Cable Drop Out Accessory

QTDO4 4 in. Cable Dropout

QTWTB Wall Termination Bracket

QTCN25 1/4 in. Coupling Nut

QTCN38 3/8 in. Coupling Nut

QTFW25 1/4 in. Flat Washer

QTFW38 3/8 in. Flat Washer

QTHN38 3/8 in. Hex Nut

QTTHRD25 1/4-20 x 72 in. Threaded Rod

QTTHRD38 3/8-20 x 72 in. Threaded Rod

QTBC38 3/8 in. Beam Clamp

QTHN25 1/4 in. Hex Nut

®

Quick Tray Application Guide

HOFFMAN2100 Hoffman WayAnoka, Minnesota 55303-1745 U.S.A763 421 2240 Fax: 763 422 2178

Litho in USA ©2005 Hoffman Enclosures, Inc. User-00002 Rev. B 1/05

Documents

Quick Tray Application Guide · QT2X2 251 251 QT2X4 4 102 2 51 QT2X6 6 152 2 51 QT2X8 8 203 2 51 QT2X12 12 305 2 51 QT2X16 16 406 2 51 QT2X18 18 457 2 51 QT2X20 20 508 2 51 QT2X24