CLUSTERMOUNTS

3625 Old Getwell Rd. / Memphis, TN 38118 / P.O. Box 18555 / Memphis, TN 38181-0555 / Phone 901-362-0100 / Fax 901-794-9515www.alumaform.com ©2011 Aluma Form, Inc. 3/11

Band Clusters / Regulator Mounts / Thru-Bolt Mounts / Recloser Mounts / Wing Clusters

Cluster Mount Features & Installation . . . . . . . . . . 1

Banded Cluster Mounts . . . . . . . . . . . . . . . . . . . . . 2

Band-Type Loading Guide . . . . . . . . . . . . . . . . . . . 3

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Thru-bolt Mounts . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Recloser Mounts . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Wing Cluster Mounts . . . . . . . . . . . . . . . . . . . . . .7-8

Wing-Type Loading Information . . . . . . . . . . . . . . 9

Index

CLUSTERMOUNTS

1

CLUSTERMOUNTS

Aluma-Form Band-TypeCluster MountsCombining the Best Features ofConventional Band and Wing TypeClusters without the disadvantagesof either.

FastLineman can install transformer-ready in5 minutes. Neatly boxed unit is completelypreassembled at factory.

StrongSuper-strong and corrosion-resistant6061-T6 aluminum alloy extruded for highstrength. No stronger cluster available.

SafeLight-weight boxed units are easy and safeto store. Only one man needed to installon the pole. Aluma-Form Cluster Mounts go up quick and easy.

1. Remove preassembled cluster from box. Instruction sheet andtransformer mounting hardware are included.

2. Measure pole at desired height with tape provided. Cluster easilyadjusts to wide range of pole sizes.

3. For one-man installation, hang cluster on lag screw. (Lag screwlocates cluster & DOES NOT BEAR LOAD).

4. Tighten double arming bolts as tight as possible. Cluster nowready to receive transformers.

Features

2

CLUSTERMOUNTSBanded Cluster Mounts

Jumbo BandClustersModel 15M3-9-14-36Triple band clustermounts three3kVA thru 500kVAtransformers withANSI/NEMA typeA, B, or C, lugs

having 12”, 24” or 36” lug spacing. IncludesEP-18 extension plates and large pole bandfor use on 9.5” to 19” diameter poles. Includedtransformer mounting hardware & groundclamp. Required for use with 333kVA &500KVA transformers or regulators whichhave 36” lug spacing. NEMA C adapter platesnot supplied.

Available in wide range of modelsAll models are available in three pole sizeranges and packaged in sturdy boxes;sufficient hot dipped galvanizedtransformer mounting bolts, nuts andlockwashers furnished; ground wireclamp, instruction sheet, and polemeasuring tape furnished. See price sheetfor further ordering information.

Model 6M3-6MMounts three 3kVA thru 50kVAtransformers with 12” ANSI/NEMA typeA lugs. Complete with 5/8” transformermounting hardware and ground clamp. Provides extra pole bearing surfacegiving increased support on extremelysoft or old poles. Maintains verticalposition of transformers whereappearance is a factor.

Double Band Cluster Mounts 3KVA thru167kVA transformers, any combination of12” or 24” ANSI/NEMA Type A and B lugs.If adapters are used 167kVA thru 250kVAtransformers with ANSI/NEMA Type C lugscan be mounted.

Single Band Cluster Mounts 3kVAthru 50kVA transformers (lateststandards) with 12” ANSI/NEMA typeA lugs.

Mounts Three TransformersModel Distance from pole#15M3-6 6”#15M3-9 9”#15M3-969 9”-6”-9”

Mounts Three TransformersModel Distance from pole#6M3-6 6”#6M3-9 9”#6M3-969 9”-6”-9”

Mounts Two TransformersModel Distance from pole10M2-6 6”10M2-9 9”

Mounts two TransformersModel Distance from pole#4M2-6 6”#4M2-9 9”

Mounts One TransformersModel Distance from pole#5M1-6 6”#5M1-9 9”

Mounts One TransformersModel Distance from pole#2M1-6M 6”#2M1-9M 9”

3

CLUSTERMOUNTS

ALUMA-FORM® a leader in thedevelopment and manufacture ofaluminum alloy cluster mountingbrackets, and with many years ofresearch and experience, publishes ourloading recommendations in an effortto assist users toward prudent productselection. Normally our small cluster mounts(3–50kVA) are mechanically evaluatedwith per phase load applied at a 14”moment from their mounting padsurface. Our larger cluster mounts (50-500kVA) are mechanically evaluatedwith per phase load applied at least atan 18” moment from their mountingpad surface. In actual practice, the center of gravityof electrical equipment frequentlyexceeds 14” or 18” from their mountinglugs. This increased distance is amoment arm and effectively“multiplies” the load carried by thecluster mount. Since the main factors actinginternally are combined bending,compression, tension and shear, asimple formula of ratio of moment armlengths is not sufficient for determiningrecommended loading. ALUMA-FORM®, therefore, providesthe following Recommended MaximumLoad per Phase data based uponempirical evaluations and engineeringanalyses for our various popularmodels of cluster mounting brackets.These loads are conservative andtypically include a least a 2:1 safetyfactor. The customer is cautioned,however, that the accompanying datais published only for generalinformation in assisting in clustermount selection. The customer isadvised to check pole loading, both incolumn strength and in butt bearingload. This data is subject to changewithout notice.

Maximum Recommended Equipment Load (in pounds), perposition, for distance (in inches) from mounting pad face to

equipment center of mass (C.O.G.):

BAND-TYPE CLUSTER MOUNTS

Model

14”

4M2-6

5M1-6

5M1-9

6M3-6

6M3-6-5

6M3-6-M

10M2-6

10M2-9

15M3-6

15M3-6-5

15M3-9

15M3-9-5

15M3-969

15M3-6-14-36

15M3-9-14-36

6M3-9

6M3-969

4M2-9

2M1-6M

2M1-9M

18” 22” 26”

1,275 lbs.

3,200 lbs.

2,500 lbs.

1,275 lbs.

1,275 lbs.

2,140 lbs.

3,200 lbs.

2,500 lbs.

3,200 lbs.

3,200 lbs.

2,500 lbs.

2,500 lbs.

2,500 lbs.

5,000 lbs.

4,000 lbs.

1,020 lbs.

1,020 lbs.

1,020 lbs.

2,140 lbs.

1,020 lbs.

1,000 lbs.

2,500 lbs.

1,950 lbs.

1,000 lbs.

1,000 lbs.

1,650 lbs.

2,500 lbs.

1,950 lbs.

2,500 lbs.

2,500 lbs.

1,950 lbs.

1,950 lbs.

1,950 lbs.

3,900 lbs.

3,100 lbs.

800 lbs.

800 lbs.

800 lbs.

1,650 lbs.

800 lbs.

820 lbs.

2,000 lbs.

1,600 lbs.

820 lbs.

820 lbs.

1,375 lbs.

2,000 lbs.

1,600 lbs.

2,000 lbs.

2,000 lbs.

1,600 lbs.

1,600 lbs.

1,600 lbs.

3,200 lbs.

2,550 lbs.

660 lbs.

660 lbs.

660 lbs.

1,375 lbs.

660 lbs.

690 lbs.

1,725 lbs.

1,350 lbs.

690 lbs.

690 lbs.

1,150 lbs.

1,725 lbs.

1,350 lbs.

1,725 lbs.

1,725 lbs.

1,350 lbs.

1,350 lbs.

1,350 lbs.

2,700 lbs.

2,100 lbs.

550 lbs.

550 lbs.

550 lbs.

1,150 lbs.

550 lbs.

BAND-TYPE

Banded Clusters Loading Guide

4

CLUSTERMOUNTSBanded Cluster Mount Accessories

Model 321-A Adapter PlateFor mounting 167kVA and larger transformers with ANSI/NEMAtype C lugs (2 plates required per transformer). Unique slotfeature captures 2/4” mounting bolt head, allows one handtightening of bolt, and provides completely jump proof feature.Two 5/8” x 2” (ANSI C135.1) hot-dipped galvanized machinebolts with nut and lockwasher are included with each plate.Balance of mounting bolts required are included with clustermount.

One EP-18 extension plate required for each band.Example:6M3-6 (single band) use one EP-1815M3-6 (double band) use two EP-18’s

Transformer withtype C lug

321AAdapter

ClusterMount

Model EP-18 Extension Plate

EP-18 Extension Plates can be used with any Aluma-Form band type cluster to increase pole range.(see chart below) Extra bolts, nuts, and washers are provided.

Pole RangesAluma-Form band type clusters can be mounted on poles 6-1/2” to 19” in diameter.

TYPE POLE DIA.RANGE

6-1/2”–11-1/2”

7-3/4”–12-1/4”

9-1/2”–14”

CAT. NUMBER

ADD-5 toStandard Model No.

Standard Models

ADD-14 toStandard Model No.

EXAMPLE

6M3-6-515M3-6-5

6M3-615M3-6

6M3-6-1415M3-6-14

EP-18 WILLINCREASE MAX.

DIA. TO

Small

Standard

Large

16-1/2”

17-1/2”

19”

5

CLUSTERMOUNTSThru-Bolt Mounts

THRU-BOLT SINGLE POSITIONMOUNTSModel TB2M1-6For mounting one 3kVA thru 50kVA transformer,recloser or sectionalizer, having 12” ANSI/NEMAtype A lugs (no adapter plate required). Groundwire clamp and 5/8” hot-dipped galvanizedtransformer mounting hardware furnished withmount. Attaches to pole with two 5/8” diameterthru-bolts (not supplied) at 7-1/16” hole spacing.Mounts equipment 6” from pole surface.Model TB2M1-9Same as above except mounts equipment 9” frompole surface.

Model TB5M1-6For mounting one 3kVA thru 100kVA transformer,having 12” or 24” ANSI/NEMA type A or B lugs. Iftype C adapter plates are used a 167kVA thru333kVA transformers can be mounted. Groundwire clamp and a 3/4” hot-dipped galvanizedtransformer mounting hardware furnished withmount. Attaches to pole with two (or three) 3/4”diameter thru-bolts (not supplied) at 17-1/2” holespacing. Mounts equipment 6” from pole surface.Model TB5M1-9Same as above except mounts equipment 9” fromthe pole surface.

THRU-BOLT DUAL POSITIONMOUNTSModel DM-2M2Mounts two 3kVA thru 50kVA transformers with12” ANSI/NEMA type A lugs. Complete with 5/8”hot-dipped galvanized transformer mountinghardware and ground clamp. Attaches to pole withtwo 5/8” diameter thru-bolts (not supplied) at 12”hole spacing. Mounts equipment as illustrated.

Model DM-4M2Mounts two 3kVA thru 100kVA transformers with12” or 24” ANSI/NEMA type A or B lugs. Completewith four 3/4” and two 5/8” hot-dipped galvanizedtransformer mounting hardware, and ground clamp.Attaches to pole with two 3/4” diameter thru-bolts(not supplied) at 25-3/4” hole spacing. Mountsequipment as illustrated.

Typical Installation

6

CLUSTERMOUNTS

MOUNTS FOR OIL CIRCUIT RECLOSERS &SECTIONALIZERS

Banded ModelsThese models include all the features of Aluma-Form bandedcluster mounts. Extended segments are 9” from pole surfacefor clearance of live parts and easy working access to linemen.Each unit complete with recloser mounting bolt, nut, andlockwasher per position. Punched holes are provided in sidesof extended segments for mounting arresters. Shippedcompletely assembled in sturdy carton.Note: tighten double arming bolt as tight as possible.

Model RSM01 formounting one unit

Model RSM-3 formounting three units

Model RSM-2 formounting two units

Thru-Bolt Models for 3-Phase Applications3SPR-66Single positionmount with samefeatures as bandedmodels aboveexcept attaches topole with one 5/8”diameter thru-boltand one 1/2” lagscrew (notsupplied) at 3-5/8”hole spacing.

Recloser Mounts

7

CLUSTERMOUNTSWing Clusters

A complete line of compact,light-weight wing-typecluster mounts for mountingup to three 250kVAtransformers. Unique designeliminates welding. Rigid,pre-assembled mounts areconstructed of interlocking6061-T6 aluminumextrusions and offer theutility a broad range ofoutstanding features.No weldsUnique design eliminates welding.Interengaged extrusions allowutilization of the full strength of themetal which otherwise has to bederated in the area of any weld inaccordance with recommendeddesign parameters of A.S.C.E. OnlyAluma-Form clusters are madewithout welding.

Rigid one-piece constructionRigid pre-assembled mounts areeasy to handle, provide excellentclimbing space, look better wheninstalled, and stay that way.

Strong, compact light-weightInterengaged 6061-T6 aluminumalloy extrusions provide thestrongest and lightest weightassemblies possible. Easy to handleand maintenance free.

Can be assembled on groundIf desired units may be prewiredon ground and hoisted into positionon pole.

Pre-assembledOne piece assemblies are ready toinstall as received without anyadapter plates for ANSI/NEMA “A”or “B” lugs. 167kVA & largertransformers having dual boltANSI/NEMA “C” lugs can bemounted with any standardANSI/NEMA type C adapter.

Thru BoltMounts

(thru-bolts notsupplied)

TransformerMountingHardware

ANSI/NEMA CMTG. lugadapters(167 &

250kVA)

Model #

3MW-24-M

3MW-24-M-L

3MW-24

11MW-24

11 MW-24-L

12MW-24

12MW-30

Suffix LettersA

(ANSI C135.1)

B(ANSI C135.1)

C

AB

321-B

Description

Mounts three 3kVA through 50kVAtransformers with 12” ANSI/NEMA type “A”lugs. No adapter plates required.

Same as above, except it includes lifting eyehardware for hoisting assembly.

Mounts three 3kVA through 50kVAtransformers with 12” ANSI/NEMA type “A”lugs. No adapter plates required.

Mount three 3kVA through 167kVA units toboth ANSI/NEMA 12” or 24”, type A or Blugs.

Same as above, except includes lifting eyehardware for hoisting assembly.

Mounts three 3kVA through 100kVAtransformers and combination of 12” or 24”ANSI/NEMA type “A” or “B” lugs. If 321-Badapter plates are used, 167 and 250kVAtransformers can be mounted.

Mounts three 3kVA through 100kVAtransformers and combination of 12” or 24”ANSI/NEMA type “A” or “B” lugs. If 321-Badapter plates are used, 167kVA transformerscan be mounted.

Six 5/8” x 2” hot galv. sq. hd. bolts, hex nutsand lockwashers are required for type A lugs.

Six 3/4” x 2” hot galv. sq. hd. bolts, hex nutsand lockwashers are required for type B lugs.

Six 5/8” x 2-1/2” high strength ASTmA325hot galv. sq. hd. bolts, hex nuts andlockwashers. For use with all transformerlugs. 3/4” head, 5/8” thread.

A combination of “A” & “B” above for both“A” & “B” lugs.

Aluminum adapter plate with one 3/4” x 2-3/4” ANSI C135.1 galv. bolt for attachingadapter to cluster (two required pertransformer) note: ANSI/NEMA “C”transformer lugs require two model A boltspacks.

Weight

20.3 lbs

22.5 lbs

20.2 lbs

34 lbs

35.5 lbs

34 lbs

36 lbs

2 lbs

3 lbs

2.5 lbs

5 lbs

3 lbs

8

CLUSTERMOUNTS

Model 3MW-24-MMounts 3 through50kVA transformers, upto 1,000 pounds perphase at an 18”moment. Mounts to thepole on 13” hole centersusing two 3/4” through-bolts (not supplied).Furnished with 5/8”transformer mountinghardware.

Model 3 MW-24For mounting up tothree 50kVAtransformers with 12”ANSI/NEMA type Alugs. Pole thru-boltholes are 3/4” on 12”centers (thru-bolts notsupplied).

Model 11 MW-24Mounts 3 through167kVA transformers,up to 2,000 poundsper phase at an 18”moment. Mounts tothe pole on 18” or 12”hole centers usingtwo or three 3/4”through-bolts (notsupplied). Furnishedwith our unique, highstrength transformermounting bolts andhardware.

Model 12 MW-24Model 12 MW-24 allows24” of spacing betweenoutside positions. Formounting up to three250kVA transformers.Pole thru-bolt holes are3/4” on 15” centers(thru-bolts not supplied).

Model 12 MW-30Model 12 MW-30allows 30” of spacingbetween outsidepositions. Formounting up to three167kVA transformers.Pole thru-bolt holesare 3/4” on 15”centers (thru-boltsnot supplied).

Wing Cluster Mounts

CLUSTERMOUNTS

9

Although there are no industry standardsfor cluster mounts, Aluma-Form®, as aleader in the development andmanufacture of clusters, and with manyyears of research and experience havingbeen logged, feels it necessary topublish our recommendations in aneffort to assist users toward prudentproduct selection. Normally cluster mounts are loadtested with loads applied eighteen (18)inches from the transformer mountingsurface of the cluster. In actual practice, the center of gravityof large transformers may be more thaneighteen (18) inches from the face ofthe cluster. Some designs are found tohave the load center as much as twenty-six (26) inches from the cluster face.This increased distance acts as amoment arm and “multiplies” the loadcarried by the cluster mount. Since the main factors acting internallyare combined bending, compression,tension, and shear, a simple formulabased on moment arms is not totallysatisfactory for determiningrecommended loadings.

Wing Type

Aluma-Form®, therefore, feels that thedistance of the center of gravity fromthe cluster should be taken into accountalong with the weight of the transformerwhen applying very heavy loads. Thelist below contains Aluma-Form’srecommended loading date for variouscluster mounts. The customer iscautioned however that theaccompanying data is published onlyfor general information in assisting incluster mount selection. The customeris advised to check pole loading, bothin column strength and butt bearingload.

WING-TYPE CLUSTER MOUNTS

Model

3MW-24

3MW-24-M

11MW-24

12MW-24

12MW-30

Maximum Recommended Equipment Load (in pounds), perCluster Mount Phase, for typical distance (in inches) frommounting pad face to equipment center of mass (C.O.G.):

625 lbs.

1,250 lbs.

2,500 lbs.

2,500 lbs.

2,000 lbs.

500 lbs.

1,000 lbs.

2,000 lbs.

1,950 lbs.

1,550 lbs.

410 lbs.

820 lbs.

1,640 lbs.

1,600 lbs.

1,275 lbs.

350 lbs.

700 lbs.

1,385 lbs.

1,350 lbs.

1,075 lbs.

14” 18” 22” 26”

Loading Information

ALUMA-FORM®

3625 Old Getwell Rd./Memphis, TN 38118 / P.O. Box 18555 / Memphis, TN 38181-0555 / Phone 901-362-0100 / Fax 901-794-9515www.alumaform.com ©2012 Aluma Form, Inc.