Section 9 Cables

7/24/2019 Section 9 Cables

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SECTION 9

CABLES

MC 9

CP IN


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J. Roger Preston Vietnam Co., Ltd

SECTION 9 CABLES MC 9 CP IN

The English language version prevails u tin sdng ting Anh khi c tranh chpSECTION 9/VISTA VERDE SPECS/ ELECT 9/1

9.1 GENERAL

9.1.1 DESCRIPTION

The Sub-Contractor shall include for the

supply, installation and testing of all cables andaccessories specified herein and shown on the

Sub-Contract Drawings.

9.1.2 STANDARDS

All equipment, materials and workmanship

shall comply with the appropriate Singapore

or British Standards or an acceptable

equivalent international standard as well as

all local statutory obligations and regulations.

All aspects of the installation shall be in

accordance with the requirements of the

Singapore Standards Code of Practice CP 5:

1998 - Electrical Installation.

9.2 EQUIPMENT

9.2.1 PVC INSULATED CABLES

All PVC insulated cables shall consist of

annealed copper conductor complying with BS6004: 1995 - Specification for PVC-insulated

cables (non-armoured) for electrical power and

lighting unless indicated otherwise on the

Sub-Contract Drawings. The rated voltage of

the PVC cables shall be 600/1000 Volts.

The minimum cable size shall be 2.5mm2 for

lighting and 2.5mm2for small power or control

circuits.

Neutral conductors shall have black insulationand live or phase conductors, red, yellow or

blue insulation with phase identification

sleeves at each termination.

All cables shall pass Authority type tests and

batch tests or approved under Authoritys

quality certification scheme.

9.1 TNG QUT

9.1.1 M T

Nh thu scung cp, lp t v kim tra tt ccp

v linh kin c nu ra y v thc hintrn bn v.

9.1.2 TIU CHUN

Tt ctrang thit b, vt tv nhn cng sphi

tun theo tiu chun Singapore or British

Standards hay mt tiu chun quc t tng

ng cng nh tt c cc quy nh php l v

php lut ca nc sti.

Tt cphng php lp t phi ph hp vi tiu

chun ca Singapore Standards Code of Practice

CP 5: 1998 - Electrical Installation.

9.2 THIT B

9.2.1 CP BC CCH IN PVC.

Tt c cp bc PVC gm c dy dn ng c

theo tiu chun BS 6004: 1995 - Specification forPVC-insulated cables (non-armoured) for electrical

power and lightingngoi tr c chnh khc trn

bn v. Gi trin p cp phi l 600/1000 Volts.

Tit din cp nhnht l 2.5mm cho n v cho

cc mch iu khin hay thit bc cng sut nh.

Dy trung tnh sc cch in mu en v dy phac cch in mu , vng, xanh v c cbc mu

mi u cui phn bit pha.

Tt ccp phi qua kim tra ca cquan c thm

quyn v c chng nhn cht lng.


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All PVC shall be flame-retardant.

9.2.2 FLEXIBLE CORDS

Flexible cords shall be 300V/500V grade to BS

6500: 1994 - Specification for insulated flexiblecords and cables. It shall be multi-stranded

copper conductors, high temperature, PVC

insulated with flame retardant white circular

PVC sheath.

The minimum size of conductor shall be

2.5mm2.

9.2.3 PVC INSULATED ARMOURED CABLES

(PVC/SWA/PVC)

PVC insulated, PVC sheathed, steel wire

armoured, PVC sheathed cables

(PVC/SWA/PVC), shall be 600V/1000V grade

to BS 6346: 1989 - Specification for PVC

insulated cables for electricity supply. It shall

stranded, shaped, copper conductor cores of

equal cross section and colour coded

insulation.

PVC insulated cores shall be sheathed with

flame retardant PVC which shall serve as abedding for galvanized single steel wire

armouring. The armouring shall be covered

with an outer flame retardant PVC sheath.

9.2.4 M.I.C.S. CABLES

All M.I.C.S. cables and cable accessories,

glands, etc. shall be 1000V grade to BS 6207:

1991 - Specification for mineral insulated

copper sheathed cables with copper

conductors and fittings to BS 6081: 1989 -Specification for terminations for mineral-

insulated cables suitable for heavy duty

industrial applications. All M.I.C.S. cable

fittings and accessories shall be manufactured

by the appropriate cable manufacturer and

only one make of cable shall be used.

Tt cPVC sl loi chy chm.

9.2.2 DY DN MM

Dy dn mm l loi 300V/500V theo BS 6500:

1994 - Specification for insulated flexible cords andcables. N l loi rut dy ng nhiu si, chu

nhit, cch in PVC vi v bc PVC bao quanh

mu trng chng chy.

Tit din nhnht l 2.5mm.

9.2.3 CP CCH IN PVC BC GIP

(PVC/SWA/PVC)

Cp cch in PVC, bc PVC, gip bc bng dy

thp, vPVC in p cch in 600V/1000V theo

tiu chun BS 6346: 1989 - Specification for PVC

insulated cables for electricity supply. L loi dy

dn ng nhiu si, c tit din v mu code cch

in tng ng.

Dy cch in PVC s c bc bng loi PVC

chng chy, c sdng nhmt lp nn bcnhng si thp mkm. Lp gip st s li c

bo vbng mt lp PVC chng chy bn ngoi.

9.2.4 CP CHNG NHIU M.I.C.S.

Tt ccp M.I.C.S. v phkin khc, np m, v.v

sl loi 1000V nhBS 6207: 1991 - Specification

for mineral insulated copper sheathed cables with

copper conductorsand fittings to BS 6081: 1989 -

Specification for terminations for mineral-insulated

cables thch hp cho nhng ngnh cng nghip

nng. Cc khp ni v ph kin khc phi c

lm bi nhng nh sn xut cp thch hp v ch

sdng ca cng mt nh sn xut.


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9.2.5 FIRE RESISTANT CABLES

All fire resistant cables shall comply with BS

6387: 1994 - Specification for performance

requirements for cables required to maintain

circuit integrity under fire conditions.

They shall be single-core, unarmoured cables

rated at 450/750V, each comprising stranded,

circular annealed copper conductor, MICA

tape fire barrier, insulation of XLPE, EPR or

other special fire resistant compound with

continuous temperature rating of min. 850C

and an extruded oversheath of PVC in orange

or black colour.

The minimum size of each conductor shall be2.5mm2.

Fire resistant cable shall be strapped or tied to

the cable support system using stainless steel

cable ties or stainless steel strapping which

are tested and approved for use in fire

resistant wiring system.

All relevant test certificates of the cables shall

be submitted to the Engineer for approval prior

to ordering.

9.2.6 CROSS-LINKED POLYETHYLENE

INSULATED ARMOURED CABLES

(XLPE/SWA/PVC OR XLPE/AWA/PVC)

Cross-linked polyethylene insulated steel wired

armoured and PVC sheathed cables

(XPLE/SWA/PVC) shall comply to BS 5467:

1989 - Specification for cables with

thermosetting insulation for electricity supply

for rated voltage of up to and including

600/1000V and up to and including

1900/3300V with insulation grade to suit the

operating voltage and cores of equal cross

section.

Conductors shall be formed from high

conductivity full annealed stranded copper.

9.2.5 CP CHNG CHY

Tt c cp chng chy phi tun theo BS 6387:

1994 - Specification for performance requirements

for cables required to maintain circuit integrity under

fire conditions.

Chng l loi cp n, khng bc gip, gi trin

p 450/ 750V, mi si gm nhng dy dn bng

ng trn c ti luyn, dy bng MICA ngn la,

cch in loi XLPE, EPR hay loi ho cht c bit

chng chy c gi trnhit chu c thp nht

l 850C v c thm mt lp v bc p PVC mu

trng hay cam.

Tit din nhnht ca mi dy dn l 2.5mm2

.

Cp chng chy sc gihay buc cht vo h

thng khung bng nhng dy buc bng cable

ties hay dy bng bng thp khng r loi c

kim tra v cho php sdng trong h thng dy

chng chy.

Tt c nhng chng nhn kim tra lin quan n

cp phi c xem xt v ng bQun l K

thut trc khi c t hng.

9.2.6 CP BC GIP, CCH IN CROSS-LINKED

POLYETHYLENE (XLPE/SWA/PVC OR

XLPE/AWA/PVC)

Cp c vbc PVC, gip bng si thp, cch in

l Cross-linked polyethylene (XPLE/SWA/PVC) phi

tun theo BS 5467: 1989 - Specification for cables

with thermosetting insulation for electricity supply for

rated voltage of up to and including 600/1000V and

up to and including 1900/3300V c loi cch inph hp vi in p lm vic v rut c tit din

tng ng.

Dy dn phi c lm tdy ng c ti luyn

hon ton v c tnh dn in cao.


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Conductor screening shall be non-metallic and

consist of either a semi-conducting tape or a

layer of extruded semi-conducting compound,

or a combination of the two.

Insulation shall consist of cross-linkedpolyethylene which is applied by extrusion to

form a compact homogeneous body.

Insulation screen shall consist of either a

semi-conducting compound or a combination

of the two. A metallic screen consisting of

either plain or tinned copper tape shall be

applied over the semi-conducting screen

except where rendered unnecessary by wire

armouring.

The cores of multi-core cables shall be laid up

with suitable fillers to form a compact circular

assembly. Multi-core cables shall have steel

galvanised wire (SWA) or galvanised steel

tape armour and single core cables shall have

aluminum wire armour (AWA) protection.

The bedding for multi-core wire armoured

cable shall consist of layers of

semi-conducting non-vulcanisable rubber-link

tape. Three core cable may be armoured withtwo layers of galvanized steel tapes with a

bedding of an extruded layer of heat resisting

PVC complying with BS 6746: 1990 -

Specification for PVC insulated and sheath of

electric cables.

9.3 INSTALLATION

9.3.1 GENERAL

The Sub-Contractor shall include for provision,installation, testing and commissioning of all

cables, conduits, trays, trunking and

accessories specified herein, shown on the

Sub-Contract Drawings and those items not

expressly specified but required to meet the

design intent of this Section.

Cables shall be enclosed in conduit or trunking

Lp mng bc dy dn sl loi phi kim loi v c

mt lp dy bng hay mt lp p hp cht bn dn,

hay kt hp chai.

Scch in gm c cross-linked polyethylene chtc ng dng to nn mt khi c ng cht.

Lp mng cch in gm c mt lp hp cht hay

kt hp c hai. Mt lp mng kim loi bng dy

bng ng trng thic hay trn sc bao quanh

lp mng bn dn ngoi trnhng chc yu

cu khng cn thit bng dy bc gip.

Rut ca cp nhiu si sc xp t bng mt

cht thch hp to nn mt khi trn c. Cp

nhiu rut sc dy thp mkm (SWA) hay bc

dy bng thp mkm v dy n sc bc dy

nhm bo v.

Lp cui ca dy cp nhiu rut bc gip gm c

cc lp dy dn mng bng bng cao su. Cp ba

rut c thc bc gip vi hai lp dy bng thp

mkm vi lp cui chu nhit bng PVC theo tiuchun BS 6746: 1990 Tiu chun k thut cho

cc cch in bng PVC v cp chng nhiu.

9.3 LP T

9.3.1 TNG QUT

Nh thu c nhim vcung cp, lp t, kim tra vthm nh tt c cp, ng dn, trunking, mng v

nhng ph kin c nu ra y v c th

hin trn bn vv nhng ci khng bt buc

tuyt i nhng yu cu phi ph hp nh thit

ktrong phn ny.

Cp dn phi i vo trong ng hay trunking ph hp


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in accordance with CP 5: 1998 for capacities

of conduits and space factor for capacities of

trunking.

All wiring shall be carried out on the loop-in

system and the wires drawn into the conduitsafter the whole of the installation has been

completed.

Joints or connectors shall not be allowed in

wiring cables.

Exposed ends of conductors of 6mm2 and

above not filled with sockets shall be sweated

solid for connection to clamp terminals.

Cables which forms part of undergroundnetwork to be installed by the Sub-Contractor

and subsequent handover to either PowerGrid

or other relevant authorities shall comply with

the latest edition of PowerGrids Guideline &

Material Specification for Underground LT

Network in Housing & Industrial Estates

9.3.2 PVC INSULATED CABLES

Where PVC cables are indicated on the Sub-

Contract Drawings, the Sub-Contractor shallprovide all the necessary sleeves, trays,

conduits, supports and cable trunking, glands,

shrouds, end boxes, clamps, compounds

specialist tools, etc., necessary to install and

make off the cables in accordance with good

engineering practice and as hereunder

specified and shown on the Sub-Contract

Drawings.

All cables shall be provided with identification

labels at each end and at all positions wherecables change direction. In instances where

cables are multiple at 10m intervals. Labels

shall be manufactured from metal disc

engraved to show the size of the cable phase

and the equipment being fed.

Where multi-core cables are for indication,

protection and control applications, each core

vi yu cu CP 5: 1998cho slng cp trong ng

v hskhng gian ca trunking.

Tt cdy dn sc lp t theo htng mch

vng (loop-in) v dy dn c ko trong ng saukhi ton bslp t hon tt.

Dy dn khng c php c nhng chni hay

u ni.

u dy trn tit din t6mm trln khng c

lp trc tip vo cm m c kt ni qua mt b

u ni.

H thng mng cp ngm di t c lp tbi nh thu bn giao cho Li in Quc Gia

hay cquan hu quan phi tun theo qui tc lp

t Li in ngun phin bn mi nht Guideline

& Material Specification for Underground LT

Network in Housing & Industrial Estates

9.3.2 CP BC CCH IN PVC

Nhng chcp PVC thhin trn bn v, nh thu

slp t tt ccc mng, ng, thanh treo cp vtruking, hp ni, kp ng, tm m, nghchuyn

dng, v.v cn thit lp t v lm du cp ph

hp vi cng vic ca mt kslnh nghvnh

c nu ra y hay thhin trn bn v.

Tt ccp phi c nhn nhn dng ti mi u v

ti nhng chm cp i hng. Chng hn nhnhng ch cp c bi s cch khong l 10m.

Nhn dn sc lm ttm lim loi c khc in

su chknh thc ca cp, pha v thit bm

chng cp ngun ti.

Ch cp nhiu rut lp t hin th, bo v v

iu khin, mi si sc mt snhn din v c


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shall have an identification number and

engraved ferrules over the cable tails. The

ferrules shall be numbered to correspond to a

wiring diagram agreed by the Engineer. All

wires shall be terminated with an acceptable

type of clamp connector. Pinching screw typeconnectors shall not be acceptable.

All cables shall be installed in accordance with

the CP 5: 1998, the cables being run between

their source and termination points installed on

cable trays, in ducts, clipped to ceilings and

wall or as otherwise specified on the

Sub-Contract Drawings.

Cables shall in general be supported by cable

ladders or perforated cable trays.

The cable ladder/ tray supports shall be

spaced at such intervals to ensure that the sag

shall be not more than 1/500 when installed

with cables, otherwise corrective measures

shall be carried out to the Engineer's

satisfaction.

Cables run horizontally, shall be properly

supported and cleated at intervals not

exceeding 2m directly to the cable ladder/ tray.Where cables are installed vertically, they shall

be cleated at distances not exceeding 1m.

Where cables are run in areas exposed to

weather, they shall be installed in hot-dipped

galvanised metal trunking.

The Sub-Contractor shall be responsible for

the off loading and handling of the cables on

site and shall ensure that cables are delivered

to site on drums and properly protectedagainst mechanical damage.

9.3.3 ARMOURED CABLES (PVC/SWA/PVC)

Cables shall be terminated in a gland fitted

with an armour clamp. The gland body shall be

provided with an internal conical sealing to

receive the armour clamping cone and a

vng kim loi khc s cui u cp. Chng s

c nh stng ng vi su dy c

s ng ca Qun l K thut. Tt c dy dn

phi c u ni bng mt loi u ct thch hp.

Khng c sdng loi u ni l c kp.

Cp sc lp t theo tiu chun CP 5: 1998,

cp chy gia ngun ca chng v im cui c

lp t trn mng, trong ng dn, kp trn trn,

tng hay nhng vtr khc c thhin trn bn

v.

Cp ni chung sc treo bng thang treo cp

hay mng treo c khot l.

Thanh treo mng/ thang st cch khong sao

cho vng khng qu 1/500 khi c mang cp,

ngc li sphi hiu chnh sao cho thomn vi

yu cu ca Qun l Kthut.

Cp t nm ngang sc treo mt cch thch

hp vi khong cch treo mng/ thang khng qu

2m. Ch cp t thng ng, chng sc ctcht vi khong cch khng qu 1m.

Nhng ch cp i ngoi tri, chng s c lp

trong trunking kim loi c mkm.

Nh thu c trch nhim bc dv qun l cp v

m bo rng chng c giao n ni phi cn

nguyn kin v c bo vcn thn trnh b

hng vckh.

9.3.3 CP BC GIP (PVC/SWA/PVC)

u cp sc lp vo mt tm m bng mt

ci kp st. Thn tm m sc mt ron hnh nn

gn ci kp st u cn v mt con b long, ci

m s bo v ci kp v ming lt st hnh nn.


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clamping nut which shall secure the armour

clamping cone and conical armour seating. A

flame retardant PVC shroud shall be fitted to

cover the gland body.

Cable conductor terminations shall be bymeans of heavy-duty compression cable lugs.

The lugs shall be high conductivity copper

electro-tinned and applied to the conductor by

means of a hydraulic crimping tool or unless

otherwise specified.

Cables within cable ducts and draw pit

systems shall be installed by means of normal

hand running off the cable drum. It shall enter

the draw pit protected by roller guides and be

drawn through by hand. Cable winches shallnot be employed.

Unless agreed by the Engineer, straight

through joints in cables shall not be allowed.

The minimum bending radius shall be not less

than twelve times the overall cable diameter or

in accordance with the cable manufacturer's

recommendation.

Unless otherwise specified, all cable ducts anddraw pits shall be provided by the

Sub-Contractor.

9.3.4 M.I.C.S. CABLES

Cables shall be sealed immediately after

cutting. All cable shall give a minimum of

10Mwhen tested on a 1000 V D.C. Megger

immediately and 48 hours after sealing. The

Engineer reserves the right to test all cables

during installation and up to the end of themaintenance period. Any cables not giving a

satisfactory insulation level shall be resealed or

if considered necessary by the Engineer,

replaced by the Sub-Contractor to obtain a

satisfactory test reading.

Cables terminations at distribution boards,

switchgear and apparatus generally shall be

Mt lp PVC chng chy bao quanh bo vthn

tm m.

u ni cp s c lm bng u ct chu lccao. u ct l loi ng trng thic c tnh dn

in cao v lp vo u cp bng khun dp thy

lc hay trphi c nhng yu cu khc.

Cp trong ng dn v hko cp sc lp bng

cch ko chng tut ra khi cun cp. Chng sri

vo hcp c che li bi hai cnh bn ca roller

v c ko ra bng tay. Khng c dng ti hay

rng rc ko cp.

Trphi c sng ca Qun l Kthut, trn

cp khng c php c su ni.

cong ti thiu khng c vt qu 12 ln ton

bng knh ca cp hay theo hng dn ca

nh sn xut.

Trkhi c nhng chnh khc, tt ccc ng dnv hcp phi c lm bi nhthu.

9.3.4 CP CHNG NHIU M.I.C.S.

Cp phi c bt kn ngay sau khi ct. Tt ccp

phi c gi trcch in ti thiu 10Mkhi o kim

tra ngay lp tc 1000 V D.C. bng Mega Ohm v

48 gi sau khi bt kn. Qun l K thut c quyn

kim tra cp trong sut qu trnh lp t v cho n

khi kt thc thi gian bo hnh. Bt kcp khngthomn cp cch in sc sa cha hoc

nu cn thit sc Qun l Kthut xem xt v

thay thbi nh thu t c gi trkim tra

ph hp.

u ni cp ti nhng tphn phi, my ct v thit

bni chung sc gn bng loi vt xit vi vng


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made by means of cold screw-on pot type

seals with ring type universal glands. Brass

locknuts with serrated washers shall be used

where cables terminate at apparatus not

provided with screwed entry. For termination of

single core cables to equipment, a piece ofnon-ferrous plate shall be provided. Screw on

cable lugs shall be provided for the cable

connections to equipment.

Through joints, if required, shall be of the

brass sleeve type. The sleeve shall be

internally threaded at each end to receive a

ring type universal gland, fitted to each of the

cable ends. An ebonite spreader shall be used

within the sleeve to hold the cores in position.

Solder type connections shall be used on allcables up to and including 16mm2. Above this

size, mechanical type connections shall be

used.

All joints shall be of acceptable manufacture

and carried out fully in accordance with

manufacturer's installation recommendations.

All terminations and seals shall be made in

accordance with agreed methods, care being

taken to exclude moisture and foreign matter.Compound used in the making of seals shall

be capable of withstanding a temperature of

1500C with plastic sleeving to copper cores.

Where M.I.C.S. cables are installed during

building construction and may be liable to

mechanical damage, they shall be provided

with adequate temporary protection in the form

of sheet steel troughs or by other acceptable

method. Damaged cables not so protected

shall be replaced by the Sub-Contractor at hisown cost.

Where M.I.C.S. cables pass through walls,

they shall be protected with a piece of pipe

sleeve bushed at each end and built into the

wall.

All cables shall be routed entirely separate

m loi thng thng. Oc kho bng ng thau c

long n rng ca sc sdng nhng ni

cp ni vo thit bkhng c lbt vt. i vi cp

n ni vo thit b, mt ming kim loi mu s

c lp vo. Cp ni vo thit bssdng loi

vt bt vo u ct ca cp.

Sni dy, nu cn thit, slm bng mng xng

ni bng ng thau. Mng xng l loi ren rng ti

mi im cui gn mt vng m thng dng,

lp vo mi im cui ca cp. Mt ngn cp c

s dng trong mng xng gi dy ng v tr.

Loi mi ni hn ssdng cho cp di16mm.

Nu ln hn, sdng loini ckh.

Tt cu ni phi ca nh sn xut chuyn dng

v slp t phi hon ton tun theo hng dn

ca nh sn xut.

Tt c s u ni v ron phi lm theo ng

phng php, ch trnh nhng vt lhay m t.

Hp cht sdng lm ron phi c khnng chunhit 1500C

Nhng ch lp t cp chng nhiu M.I.C.S. trong

sut qu trnh xy ng to nh do c khnng b

hhng vckh, chng phi c bo qun tm

thi trong nhng mng bng thp tm hay bng

cch khc c chp thun. Cp b h hng do

khng c bo qun tt sphi c thay thbi

nh thu bng chnh chi ph ca h.

Khi cp M.I.C.S. i xuyn qua tng, chng s

c bo vbng mt ming ng lt bc ngoi ti

mi im cui v c lp vo trong tng.

Cng vic lp t hthng ng dn v lp t cp


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from pipework associated with other services.

Where M.I.C.S. cables pass through floors,

they shall be protected for a distance of not

less than 300mm from floor level with pipe

sleeves.

Where three phase power is run in M.I.C.S.

single cores, the cables shall be installed in a

manner to prevent unnecessary heating up of

the sheaths which will involve an installation in

trefoil formation of the three phases R.Y.B. or

grouped in a double layer for a 4-wire 3 phase

system and spaced from other conductors.

Alternatively, they may be arranged in single

layer, flat formation, touching throughout their

length or if the Sub-Contractor so wishes may

be ordered from the Supplier already laid up intrefoil twisted formation.

M.I.C.S. cables connecting L.V. switched

inductive loads shall be protected from voltage

surges by surge suppressors at the

conductors terminations.

9.3.5 CABLE PIPE SLEEVES, MULTI-CABLE

TRANSITS AND FIRE STOPPING

In certain places, where cables pass throughfloors, walls or other partitions, pipe sleeves

shall be supplied and set in position by the

Sub-Contractor.

After installing the cables, the pipe sleeves

must be thoroughly grouted in or otherwise

securely fixed in position and the space

between the cables and the sleeves

completely filled in with a fire-resisting material,

acceptable to the Fire Services Bureau, and

which has no deleterious effect on the cables.

Every cable entry from exterior into the building

shall be sealed by a Multi Cable Transit

System approved by the Engineer.

The system shall consist of a mild steel frame

with completion tecron insert blocks to

ensure that a gas and liquid tight seal is

phi hon ton tch bit nhau. Nhng ch cp

M.I.C.S. i xuyn qua sn, chng sc bo v

vi khong cch ln hn 300mm tmt sn vi c

ng.

Khi ngun ba pha i bng cp n M.I.C.S., chng

s c lp t theo mt phng php ngn

nga st nng khng cn thit ln v l kiu

lp theo hnh ba l cho ba pha R.Y.B. hay nhm

trong mt lp i cho hthng 3 pha bn dy v v

cch khong vi nhng dy dn khc. Hoc l

chng c thc sp xp trong mt lp n, kiu

phng, nhn thy c trn sut chiu di ca

chng hay nu nh thu mun, chng c thc

order tmt nh cung cp loi kiu hnh ba l xon

li.

Cp chng nhiu M.I.C.S. ni vi ti cm L.V s

c bo vkhi in p nhiu bng bkhnhiu

ti mi im cui ca dy dn.

9.3.5 NG BC LT CP, SL CHCP I QUA

V CHNG CHY

mt sni cp i xuyn qua nhsn, tng haynhng chng ngi vt khc, cbc ng sc

lp t bi nh thu.

Sau khi lp t cp, cng bc cp phi c trm

trt tht klng hay c lp mt cch chc chn

v khong khng gia cp v c ng bc phi

c lm y hon ton bng vt liu chng chy,

ph hp vi quy nh ca S phng chy cha

chy, loi khng nh hng c hi i vi cp.

Cp tngoi i vo trong to nh sc bt kn

bng b chuyn cp (MCT) c ph chun bi

Qun l Kthut.

.

H thng gm c mt khung thp vi cc b lm

kn m bo l hon ton kn khi gas v cht

lng. Snn cht c lm bi tm p v thit b


11/14




achieved. Compression shall be achieved by

either compression plate and end packing

device or by use of a press wedge.

All unused openings in the frame shall be fully

sealed by 'blind' inserts.

9.3.6 EXCAVATION, REINSTATEMENT AND

LAYING OF CABLES

Underground cable shall be laid direct in

trenches unless otherwise indicated (i.e. uPVC

circular cable ducts).

When cable trenches are opened all cables

shall be laid and the trenches shall be

back-filled within 24 hours. At all times safetyprecautions shall be taken and arrangements

made to prevent damage to cables.

Trenches shall be excavated to provide the

minimum cover as follows:-

Type of

Cable

In open

ground

and

under

pavement(mm)

Under road

subject

to vehicular

traffic

(mm)

In other

situation

Control

cable600 800

As

Indicated

L.V.

0.6/1kV600 800

As

Indicated

H.V. 1kV

and

above

1000 1000As

Indicated

Turf and top soil shall be removed carefully

and preserved for re-instatement in their

original positions.

Broken land drains and damage to other

services shall be reported and indicated. All

subsequent costs due to damages shall be

borne by the Sub-Contractor.

The excavation shall be kept free of water and

ng hay sdng ci nm.

Tt cnhng chhkhng sdng trn khung s

c bt kn hon ton bng cht lm kn.

9.3.6 HO, SSAN LP, SSP T CP

Cp chn ngm di t s c t trc tip

trong rnh tr khi c nhng yu cu khc (chng

hn nhng dn cp trn nha PVC).

Sau khi cp c t vo rnh, chng phi c

san lp li trong vng 24 gi. Lun t bng bo

ch an ton trnh lm hhng cp.

Hchn sc o vi kch thc ti thiu nh

sau:

Loi cp

Trn mt t

v di va

h

(mm)

Di

ng giao

thng

(mm)

Cc tnh

hung

khc

Cp iu

khin600 800

Nhhin

th

L.V.

0.6/1kV600 800

Nhhin

th

H.V. 1kV

v ln

hn

1000 1000Nhhin

th

Cc tng v lp t s c o mt cch cn

thn v gisan lp li nhvtr cca chng.

Nhng ng rnh thot nc b b hay lm h

hng nhng cng trnh khc phi c bo co v

trnh by. Tt cnhng chi ph do lm hhng s

phi chu bi nh thu.

Nhng rnh o phi gikh ro, khng c nc


12/14




properly shored up. Other services uncovered

shall be adequately supported by slings or

other means and protected.

Before cables are laid, the bottom of the trenchshall be evenly graded, cleared of loose stones

and then covered with a 75mm layer of earth

which has passed through a sieve with a

maximum mesh of 12mm or where local

ground is unsuitable, with sand.

Power cables shall be pulled in over

adequately spaced cable rollers and the

resulting surplus cable shall be snaked across

the width of the trench. In straight run trenches

cable crossing is not permitted except wherecables branch from the main run. At each

draw-in point, joint or junction box the cable

shall be left slack. Cables shall not be pulled

taut to straighten them after laying. The Sub-

Contractor shall ensure that the strain is taken

on the cores as well as the sheath when

cables are laid.

Where more than one cable is laid in a trench

the cables shall be spaced apart in

accordance with their current rating but subjectto the minimum spacing specified as follows:-

v c chng mt cch hp l. Nhng cng

trnh ph khng c che chn khc s c

chng bng cch treo mc hay nhng cch

khc v c bo v.

Trc khi t cp, y rnh phi lm cho bngphng, loi trnhng vin lng lo ra khi hri

lp mt lp t dy 75mm c sng lc qua lp

li c c mt li rng ti a 12mm hay cht

khng thch hp, c ct.

Cp ngun sc ko qua cun cp c t vi

khong cch thch hp v cui cng cp dsb

ngang qua b rng ca rnh. Trn ng thng

ca hchn khng cho php o ct ngang nhau

tr nhng ch cp chia t ng chnh. Ti miim ko cp vo, u ni hay hp ni cp nn

trng ra. Cp sau khi ko khng nn b ko cng

thng. Nh thu phi m bo l sc cng trn cp

bng vi vbc khi cp c lp t.

Khi c hn mt cp t trong rnh, cp sc t

vi cch khong ph hp vi gi trdng in ca

chng nhng tu thuc vo khong cch ti thiuc cho nhsau:


13/14




Cable H.V L.V

MATV/

Tel

(depth

in mm)

DataCon

trol

Gas,

water

and

other

piped

service

H.V

L.V

MATV/

Tel

Data

Control

Gas,

water

and other

piped

services

300

300

300

300

300

300

150

150

150

300

300

150

50

50

250

300

150

50

50

250

300

150

50

50

250

300

300

250

250

250

(Where this is not possible, 50mm thick

concrete or stone tiles shall be used as

separators)

After laying, the cables shall be covered with

enough fine sieved earth (or sand where the

local ground is unsuitable) to ensure 50mm

cover after tamping. Warning covers shall be

laid over the cables and the trench filled in and

compacted.

Reinstatement shall be effected by back-filling

in 100mm layers and hand ramming the first

two layers. Power rammers may be used forthe remaining layers. The turf shall be

replaced and the level of the finished

reinstatement shall not protrude more than

25mm above the normal ground level.

Co-axial and control cables shall be laid to the

instructions of the manufacturer and

precautions shall be taken to prevent denting,

Cp H.V L.V

MATV/

Tel

(

su

mm)

D

liu

iu

khin

Gas,

nc &

cc h

thng

ng khc

H.V

L.V

MATV/

TEL

Data

iu khin

Gas, nc

& cc h

thng ng

khc

300

300

300

300

300

300

150

150

150

300

300

150

50

50

250

300

150

50

50

250

300

150

50

50

250

300

300

250

250

250

(Nhng ch m bng trn khng thch hp, b

tng dy 50mm hay gch lt sdng nhvt cn).

Sau khi lp t, cp pfhi c lp li hon ton vi

lp t qua sng lc (hoc ct khi t o

khng thch hp) m bo lp dy 50mm sau

khi m. Cp v hchn sc phtm che bo

vmt cch chc chn.

Hchn cp sc san lp li trong nhng lp

dy 100mm v hai lp u tin sc m. My

m c thc sdng san lp. Lp t mtc thay th v sau khi san lp mc cui cng

khng c nh cao hn 25mm so vi mt t.

Cp ng trc v cp iu khin sc lp t

theo hng dn ca nh sn xut v ch trnh

lm c vt lm, xon hay sdi chuyn ca vkhi


14/14



The English language version prevails u tin s dng ting Anh khi c tranh chp

kinking or displacement of the armouring when

laying the cable in the trench. In particular the

cable shall not be set or bent in a radius of less

than 550mm or 12 times the overall diameter

of the cable whichever is the greater.

Co-axial cables shall not be laid one over the

other.

Where it is necessary to change the level of

the cable the bottom of the trench shall rise or

fall with a slope not greater than 1 in 12.

All cable ends shall be sealed in a manner

recommended by the cable manufacturer.

Approved interlocking cable warning coversshall be provided for power cables laid direct in

the ground.

Each cable run shall be marked at the point

where it leaves the plinth, sub-station, feeder

pillar, lamp pole or other current controlling

device and shall be marked at approximately

every 75m along the cable run with an

additional marker at each change of direction

of the cable run. The Sub-Contractor shall

impress the words "LV CABLES" as requiredon each cable marker.

The location of each underground cable joint

shall be marked by a concrete slab placed

over the joint the word "JOINT" impressed on

each slab.

t cp trong h chn. C thcp khng b xon

hay cong vi bn knh nhhn 550mm hay 12 ln

ton bng knh ca cp.

Cp ng trc kkhng c t ln trn cp khc.

Nhng ch cn thay i cao t cp, y rnh

sc nng ln hay thp xung vi nghing

khng c ln hn 1/12.

Tt ccc im cui ca cp phi c bt kn nh

c hng dn bi nh sn xut.

Cp lin ng vi vcnh bo c chp thun sc cung cp cho cc ngun chy trc tip trn

mt t.

Mi cp s c nh du ti nhng im m

chng i ra nhchn ct, trm ni, ct , cc ca

n hay nhng thit b iu khin dng khc v

c nh du cch khong 75m dc theo chiu

di ca cp v ti nhng chcp i hng. Nh

thu sng du ch "LV CABLES" nhyu cu

trn mi cable marker.

Vtr ca mi im ni cp di t sc nh

du bng mt tm b tng t ln trn v c

ng du ch"JOINT" trn mi tm.

Date post:	20-Feb-2018
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Section 9 Cables

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