IS 15785: Code of practice for Installation and maintenance of lift without conventional machine rooms

2007·6.1 MB·English

by  Bureau of Indian Standards

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Whereas the Parliament of India has set out to provide a practical regime of right to
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in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ”
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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 15785 (2007): Code of practice for Installation and
maintenance of lift without conventional machine rooms [ETD
25: Lift and Escalators]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS 15785 : 2007
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Indian Standard
INSTALLATION AND MAINTENANCE OF LIFT
WITHOUT CONVENTIONAL MACHINE ROOMS
CODE OF PRACTICE
res 91.140.90
© BIS2007
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

September 2007 PriceGroup5
LiftsandEscalators Sectional Committee,ET25
FOREWORD
ThisIndianStandard wasadopted by the Bureau ofIndian Standards, after the draftfinalized by the Liftsand
EscalatorsSectionalCommitteehad beenapproved by the Electrotechnical DivisionCouncil.
Conventionalliftrequiresseparate machineroomandspecialpulleyrooms,whereverneeded. Modem technology
showsthatmachinesandassociated partscan belocated inthewell,onthecar orincabinets.Need hastherefore
beenfelttoprepare thisCode toregulate theinstallation andfor safe workingof'Liftswithoutmachine room'.
IntheformulationofthisCode, assistance hasbeenderived from the following :
a) EN81-l / PrA2 - 2000 Safety rules for the construction and installation of lifts - Part 1:Electric
lifts- A2;Lifts without machine room; RefCEN TCIOdated2000-0I secretariatAFNOR,and
b) European Parliament andCouncil Directive 95116IECof29June 1995.
Thisstandarddoes notcoveroutline dimension ofliftswells,lift pitsandotherlayoutdimensionsnecessaryfor
liftinstallations.These arecovered inIS 14665(Part I):2000.
Thisstandard isoneofaseriesofIndian Standards on lifts.
Otherstandards published inthisseries are:
ISNo. Title
14665(Partl) :2000 Electrictractionlifts:
Guidelines foroutline dimensions of passenger,goods, service and hospital
lifts
(Part2/See Iand2):2000 Code of practice for installation, Section I Passenger and goods lifts;
Section2Servicelifts
(Part3/Sec Iand2):2000 Safetyrules,Section IPassenger andgoods lifts;Section 2Service lifts
Forthepurposeofdeciding whether aparticular requirementofthisstandardiscomplied with. the final value.
observedorcalculated.expressingtheresultofatestoranalysis.shallberoundedoffinaccordance withIS2:1960
'Rulesforroundingoffnumerical values(revised)'. Thenumber ofsignificantplaces retainedintheroundedoff
valueshouldbethesame as thatof thespecified valueinthisstandard.
AMENDMENT NO. 1 JUNE 2011
TO
IS 15785 : 2007 INSTALLATION AND MAINTENANCE
OF LIFT WITHOUT CONVENTIONAL MACHINE
ROOMS — CODE OF PRACTICE

(Page 2, clause 4.4.5, Title) — Substitute ‘Suspension Media’ for the existing.

(Page 2, clause 4.4.5, para 4) — Substitute the following for the existing:

‘Coated Steel Belts (CSB) used shall comply with Annex B. Ratio of sheave diameter to steel cord shall
remain 40 : 1 and minimum factor of safety on CSB breaking strength shall be 12. Minimum 2 CSB's shall
be used. Each Lift shall be provided with detection device or mechanism which will bring elevator to stop
in case of elongation of belt or breakage of one belt. The device shall not be of automatic reset type and
shall require intervention of competent person to reset the same.’

(Page 9, Annex B, clause B-7.2.2.7) — Add the following new clause:

‘B-7.3 Visual Check and Replacement Criteria

CSB's shall be inspected visually. If any of the following defects are observed in visual inspection, all the
CSB's shall be replaced:

- Visual damage such as a kink in CSB, exposed cords, excessive elastomeric coating wear, etc

- Steel cords, strands or wires breaking through its elastomeric coating

- Piercing of CSB by foreign object

- Damaged CSB edge where outermost cord is visible.’

(ET 25)
Reprography Unit, BIS, New Delhi, India
IS15785:2007
Indian Standard
INSTALLATIONAND MAINTENANCE OF LIFT
WITHOUT CONVENTIONAL MACHINE ROOMS
CODE OF PRACTICE
1SCOPE 4 CONSTRUCTION, INSTALLATION, PRO
TECTION AND MAINTENANCE OF LIFTS
Thisstandarddealswithspeciallifts,wherethehoisting
WITHOUTMACHINE ROOM
machine is kept inside the shaft itself, thereby
eliminating the conventional machine room. This 4.1Everyliftandpartthereofshallbeofsoundmaterial
standard is intended to help the potential users, of sufficient rating and construction and sufficient
manufacturerand the regulatory authorities who are mechanical strength for the purpose for which it is
already familiar with electric lifts complying with intendedandshallbeinstalled,protected,operatedand
existingstandards [seeIS 14665 (Part 2/Sec I and 2) maintained insuch mannersoastopreventdanger.
and IS 14665(Part3/Sec I and 2)] fortraction lifts.
4.2 Protection isdefinedas preventing damage tothe
personnel using theelevatorand maintaining thelift.
2REFERENCES
4.3Allmaterialsusedinliftsshallconformtothelatest
Thefollowing standardsarenecessaryadjunctstothis
standards,whereverapplicable.
standard:
ISNo. TItle 4.4Construction
1356(Part I): Electrical equipment of machine 4.4.1 liftMachine
1972 tools:Part I Electrical equipmentof
machines for general use (second Each elevatorshould havea machine ofitsown.The
revision) liftmachinecan beoperatedbyanelectric motor.The
8216: 1976 Guideforinspectionofliftwireropes speed reduction/control can be either by mechanical
14665 Electrictraction lifts: gears orbyelectrical means.
(Part2/Sec I Code of practice for installation,
4.4.2Braking System
and2):2000 operationandmaintenance,SectionI
Passengerand goods lifts; Section2 4.4.2.1 Generalprovisions
Servicelifts
a) The lift shall be provided with a braking
(Part3/Sec I Safetyrules,Section IPassengerand
system whichoperatesautomatically:
and2):2000 goodslifts;Section 2Service lifts
I) in the event ofloss of the mains power
(Part41Sec1-9): Components
supply;and
2001
2) in the event ofthe loss of the supply to
3TERMINOLOGY
controlcircuits.
Forthepurpose ofthisstandard,thedefinitionsgiven b) The braking system shall have an electro
inIS 14665(Part 2/Sec I)shall generallyapply. mechanical brake (friction type), butmay,in
addition, have other braking means (for
3.1NoMachineRoom- This special elevatordoes
example,electric).
notneedaseparatemachine room.
4.4.2.2 Electro-mechanicalbrake
3.2 Machinery- Equipmenttraditionally placed in
a) This brake on its own shall be capable of
the machine room. Cabinet(s) for control and drive
stopping the machine when the car is
system, lift machine, main switch(es), governor and
travelling downward atrated speedand with
means foremergency operations.
the rated load plus 25 percent. In these
3.3MachinerySpace- Space(s)insideoroutsideof conditionstheretardationofthecarshallnot
thewell wherethe machineryasawholeorinpartsis exceed that resulting from the operation of
placed. thesafety gear orstopping on thebuffer.
Allthe mechanicalcomponentsofthebrake
3.4PulleySpace- Space(s) inside or outside ofthe
which take part in the application of the
wellwhere pulleysare placed.
braking action on the drum or discshall be
IS15785:2007
installedintwosets.Ifoneofthecomponents notapply,ifthefollowingthreeconditionsarefulfilled:
is not working a sufficient braking effort to
a) Tripping of the over speed governor is
slowdown thecar, travellingdownwardsat
effectedbymeansofaremotecontrol,except
ratedspeedandwithratedloadshallcontinue
cableless, from outside the well whereby an
tobeexercised.
involuntary tripping is not affected and the
Any solenoid plunger is considered to be a
actuation device is not accessible to
mechanicalpart,any solenoidcoil isnot.
unauthorized persons;
b) Thecomponenton which the brake operates
b) Over speed governor is accessible for
shallbecoupledtothetractionsheaveordrum
inspection and maintenancefrom the roofof
orsprocketbydirectandpositivemechanical
thecar or from the pit;and
means.
c) After tripping automatically, the over speed
c) A continuous flow ofcurrent is required to
governorreturnsinto the normal position,as
hold offthe brake when the li!t is in normal
thecar, is moved in the upward direction.
use.
Howevertheelectricalparts mayreturnintothenormal
d) The interruption of this current shall be
positionbyremotecontrolfrom theoutsideofthewell
effectedbyatleasttwoindependentelectrical
which shall not influence the normal function ofthe
devices, whether or not integral with those,
over speed governor.
which cause interruption of the current
feeding the lift machine. If, whilstthe lift is 4.4.5 Suspension Ropes
stationary, one of the contactors has not
Round steel wirerope orsyntheticropeorcoatedsteel
openedthemaincontacts,furthermovement
belts can be allowed for suspension of the car and
of the car shall be prevented at the latest at
counterweight.
the nextchangein thedirectionofmotion.
e) Whenthemotoroftheliftislikelytofunction Steel wire ropes shall conform to IS 14665 (Part 4/
asagenerator,itshall notbepossibleforthe Sec 8).
electric device operating the brake to befed
SyntheticropesusedshallcomplywithAnnexA.Ratio
bythedriving motor.
of sheave diameter to diameter of rope shall be
t) Braking shall become effective without
minimum25:I and minimum factorofsafety on rope
supplementary delay after opening of the
breakingstrengthwill be 16.
brake release circuit.
Coatedsteelbelts(CSB) usedshallcomply withAnnex
NaTE- The useofa diode orcapacitorconnected
directly to the terminals of the brake coil is not B.Ratio ofsheavediametertosteel chordwillremain
consideredasameansofdelay. 40:I and minimum factor ofsafety onCSB breaking
g) Anymachinefittedwithamanual emergency strengthwill be 12.
operatingdevice(see 5.1.1)shall becapable
4.4.6 Guide RailsandGuide Shoes
of having the brake released by hand and
require a constant effort to keep the brake Guide rails and guide shoes shall generally conform
open. toIS 14665 (Part 4/Sec 2).
h) The brake shoe or pad pressure shall be
4.4.7 CarDoors,LandingDoorsandLockingDevices
exerted by guided compression springs or
weights. The requirementsspecifiedin IS 14665(Part4/Sec6)
j) Band brakesshall not beused. shall apply.
k) Brake linings shall be incombustible. 4.4.8 TerminalStoppingandFinalLimit Switch
4.4.3Lift Car
Every liftshall beprovidedwith upperandlowerfinal
The liftcarsand frames whereverprovidedshall meet limit switches arranged tostop the car automatically
the requirementsspecifiedinIS 14665(Part 4/Sec 3). within the limits oftop car clearance and bottom car
run by from any speed attained in normal operation.
Thecarframemaybeintegrated withthecarenclosure.
Such limit switches shall act independent of normal
4.4.4 OverSpeed Governor(OSG) limit switches,whereverprovided.
The requirementspecified in IS 14665 (Part 4/Sec 4) 4.4.9 Main Switch
shall apply.
Eachliftshallbeprovidedwithamainswitchandshall
The over speed governor shall be accessible and conform toIS 14665 (Part2JSee I).
reachablefromoutsidethewell.Thisrequirementdoes

2
IS15785:2007
Thisswitch shall be located: necessary and, if need be, manual
emergency operation.
a} in the cabinet for control. except if this is
mounted inthe well. or b} The clear height for movement shall not be
lessthan 1.80m.
b} attheemergencyand test panel(s) whenthe
cabinetforcontrol ismountedinthewell.If c} There shall be a clear vertical distance ofat
theemergencypanel isseparatefromthetest least 0.30m above rotating parts of the
panel. the switch shall be at the emergency machine. Thisrequirementdoes notapply if
panel. thesepartsaredirectly locatedbelowthewell
ceiling.
If the main switch is not easily accessible from the
cabinetforcontrol, then thecabinetshall beprovided 4.5.2.3 Workingareasinthecaroronthecarroof
withan isolatingswitch.
a} If maintenance/inspection work on the
4.5Installationand Maintenance machineryistobecarried outfrominsidethe
carorfromthecarroof,thefollowingapplies:
4.5.1Access
I} Anykindofuncontrolledandunexpected
Access to the interior ofthe machinery and pulley car movement resulting from
spaces shall be, maintenance/inspection that can be
dangerous to persons carrying out
a} capableofbeingproperly litbyapermanent
maintenance/inspection work shall be
electriclight fixture(s}:and
prevented by a mechanical device and
b} easy to use in complete safety in all
electricaldevice.
circumstanceswithoutnecessitatingentryinto
2} When the car is blocked against all
private premises.
movementitshallbepossibletoleavethe
4.5.2Machinery Inside the Well working area easily andsafely.
4.5.2.1Generalprovisions b} Any necessary devices for emergency
operationandfordynamictests(suchasbrake
a} Machineryspacesinside the wellshall beso
tests, traction tests, safety gear tests, buffer
constructedtowithstandtheloadsand forces
tests or tests of ascending car over speed
theyare intendedtobesubjected.
protection means) shall be arranged so that
b} In the case of wells partially enclosedat the theycanbeoperated fromoutsideofthewell.
exteriorofbuildings the machinery shall be
suitably protected against environmental 4.5.2.4 Ventilation
influences.
Themachineryspacesshallbesuitablyventilated.The
c} Provision should be given to access the electricequipmentofthemachineryshallbeprotected
machineformaintenancepurposeeitherfrom asfarasitisreasonably practicablefromdust.harmful
cartoporotherwise. fumes andhumidity.
4.5.2.2 Dimensionsofworking areasinsidethe well
45.2.5Lighting andsocket outlets
a} The dimensions ofworking areas inside the
The working area and machinery spaces shall be
wellshallbesufficienttopermiteasyandsafe
provided with permanently installed electric lighting
working on equipment, especially the
onthe basisofatleast 200 luxatfloor level.
electricalequipment.
4.5.2.6 Handling ofequipment
I} A clear horizontal area in front of the
control panelsandthecabinets.Thisarea One or more metal supports or hooks with the
isdefined asfollows: indicationofthesafe working load,asappropriate, are
i} Depth, measured from the external provided in the machinery spaces, conveniently
surface of the enclosures, at least positioned topermit thehoisting ofheavyequipment.
0.70 m;and
4.5.3Machinery Outside oftheWell
ii} Width, the greater of the following
values :0.50 mor the full width of 4.5.3.1 Generalprovisions
thecabinetorpanel.
Machinery spaces outside of the well shall be so
2} Aclearhorizontalareaofatleast0.50 m
constructed towithstand theloadsandforcestowhich
x0.60 mformaintenanceandinspec tion
theyareintendedtobesubjected.
of moving parts at points where this is
3
IS15785:2007
4.5.3.2Machinery cabinet ofminimum0.50m x 0.60 m withaminimumheight
of 2 m, shall be available for emergency and tests
a) The machinery shall be located inside a
operations.
cabinet;and
4.5.4.5 Control panel
b) The machinery cabinet shall consist of
imperforate walls, floor. roof and lockable a) Thecontrolpanelshouldbeinstallednearthe
door(s). hoistingequipmenteither inside the shaftor
outside;
4.5.3.3 Workingarea
b) Thecontrol panel should be accessiblefrom
Theworkingareainfront ofamachinerycabinetshall
the landing for maintenance purposes;
complywith therequirementsaccordingto4.5.2.2.
c) Adequatesafetymeasuresshouldbeprovided
4.5.3.4Ventilation tocontrol unauthorizedaccess;
The,machinerycabinetshallbe suitablyventilated.It d) Adequateilluminationshouldbeprovidedfor
shall besuch that the machineryisprotectedasfar as the control panel for easy maintenance.
itisreasonably practicablefrom dust. harmful fumes Illumination should be available even when
and humidity. . thereisno powersupply.Minimumof50lux
illumination should be provided for the
4.5.3.5 Lightingandsocket outlets
control panel;and
The inside ofthemachinerycabinetshallbeprovided e) Therequirementsspecifiedin IS 14665 (Part
withpermanentlyinstalledelectriclightingonthebasis 4/Sec9) shallgenerally apply.
ofat least 200 luxat floor level.
4.5.5 Over SpeedGovernor(OSG)
The switch placed inside close to the door(s), at an
The overspeed governor should be installed without
appropriateheight, shallcontrollightingofthecabinet.
hindrance tothe movementofthecar.
4.5.4DevicesforEmergency and Tests
For maintenance purposes the over speed governor
4.5.4.1 In the case ofmachinery inside the well, the should be accessible from the cartop or otherwise.
necessary devices for emergency and tests shall be
providedon a panel(s)suitablefor carryingout from 5OPERATINGAND SAFETYDEVICES
outsideofthe well all emergency operationsand any
5.1 EmergencyOperation
necessarydynamictests ofthelift.Thesedevicesshall
beinaccessibleto unauthorizedpersons. 5.1.1 Ifthe manual effort required to move the car in
theupwarddirectionwith itsratedloaddoesnotexceed
If the emergency and tests devices are not protected
400 N the machine shall be provided with a manual
insideamachinerycabinet.theyshallbeenclosedwith
meansofemergency operation allowing the car tobe
asuitablelockablecover.
moved to a landing. If the means for moving the car
4.5.4.2The panel(s)shall, can be driven by the lift moving. then it shall be a
smooth.spokeless wheel.
a) includethe emergencyoperationdevices;
5.1.2 Ifthe means is removable. it shall be locatedin
b) haveequipmentwhichenablesdynamictests
an easily accessible place in the machinery space. It
tobecarriedout; and
shallbesuitablymarkedifthereisanyriskofconfusion
c) be provided with an opening for a direct
as to the machine for which it is intended.
observationoftheliftmachineorwithdisplay
devices, which informabout: If the meansis removableor can be disengaged from
I) Direction ofmovements; themachine,anelectricsafetydeviceshall beactuated,
2) Reaching ofan unlocking zone; and at the latest when the means is coupled with the
machine.
3) Speedofthelift,exceptitisautomatically
limited up to0.63 mls. 5.1.3 It shall be possible to check easily whether the
4.5.4.3 The panel(s) shall be lit by a permanently carisinan unlocking zone.Thischeckmay be made,
installedelectriclightingon thebasisofatleast50lux for example,by meansofmarkson the suspensionor
on the level ofthe panel(s). governorropes(see also 4.5.4.2).
Aswitchplacedinsideorclosetothepanel shallcontrol 5.1.4Iftheeffortdefinedin5.1.1isgreaterthan400N.
lightingofthe panel(s). a means of electrical emergency operation shall be
provided inaccordance with 5.2.
4.5.4.4 Infront ofthe panel(s)afree horizontalarea

4