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ТаЫе A11

Correction Factor» for Q roups of three single-core caNee tod in ear

This apphee only when the cable temperature does not affect the ambient err temperature

3 Short-circuit currents

Buie assumption* for calculating the thermal short-cucurt capacity for 1 kV fire retardant power cables arg as follows:

• initial temperature for EPH-inMated cablet it +70°C

• final temperature for E₽R4naulat*d cablet it + 160°C

• initial temperature for XLPE-insulated cables it +70*C

• final temperature for XLPt-inaulated cable* is +160°C

• short-circuit currant value* are thermal value* for one second

• current valuta for the time t - 0.2 to five second* are calculated by dividing the one second ihort’ circuit value by Vt

ТаЫ* A12

One second thermal short-circuit current* for EPR-inMated power cables.
See assumption* above.

Table A13

One second thermal short-circuit current for XLPE -Insulated power cables *
See assumptions above.

In order to use the current values in Table A13 it has to be noticed that th* accessories in th* cable have to stand the temperature range given in assumptions above.

APPENDIX В

GUIDE TO USE

1. S&OCfi

This Guide to Use I* valid for the application erf 0.6/1 kV crosslinked polyethylene or vul cent ted rubber hak>ge<vfree insulated end halogen-free extruded compound sheathed single and mJti-coro power cable* with special fka performance properties, mainly intended for use in power plant* and aubstatione. end other application* where the special fire performance properties are required.

2. Objects

The object of this document i* to provide recommendation* for the selection, storage, transportation and metallation of the cables, specified under clause L Scope,

NOTE: Safety requirements as well as installation rules are net con tide red in thia Guide to Use, a* they are covered by other relevant regulations and law*.

3. Recommendation for use

3*1 Permissible application*

Specified cables according to HD 604 Pan &, Section I may be used indoors, also in wet locations, and outdoor* for fixed installations. Direct burial la allowed, as long as the relevant rules of installation are followed.

3*2 Hiohost permissible yohttiM

Cables rated at Uo/U • 0.6/1 kV may be used in DC systems having a rated operation voltage between conductor* not higher than 1 *5 kV, and between conductor* and earth not higher than 0 9 kV,

3.3 Concentric conductor

In the cable* having the concentric conductor, it can be used as neutral. PE-conductor. PEN- conductor* or a* an electric screen, *i accordance with appropriate regulations,

4. Recommendations for storage and transport

   1. Delivery

The distance betwaen the outer cable layer and the head of the drum flange* thal be sufficient to avoid damage to the cable*

Care must be taken that there is no risk from nail* in the drum flange.

The ful drum* must not be dropped during the cable transport.

For the transport of filled-up cable drums only suitable carriers ehal be used.

Cable drums shaM be transported only with the drum axes In tM horizontal position Other ways of transport are slowed only for the smallest cross-sections when agreed by the customer The drums have to be fixed against movement.

FUted-up cable drums shall be rolled only tor short distances over pitta tolta ground end only in the direction indicated on the cable drum. The cable ends have to be fixed.

Normally the minimum temperature for the transport is -2Б*С provided that the cable drum contents and cables do not move in the van during transport. Provided that care ia taken, the lower temperatures are permitted when the transport arrangements make it possible.

Short cable lengths may be coiled to rings and transported and stored horizontaty. The permissible bending radii shal not fall below the values given tn sub-clause 6.4.

5. Racommandations for the cable laving and installation

Б.1 General racom foundations

The cable route, the laying method and the service conditions ehall be taken into account when selecting the cable type.

Cablet shall be laid and operated In such a way that their properties are not endangered.

In this context at least the fullowing hems shall be taken into account:

(a) The service conditions, such as adjacent other cables. Influence of external heat specific earth resistance, closed spaces (ducts, conduits and troughs), and solar radiation_T form the basis for the selection of the cable type.

(bl Stray currents and corrosion.

(c) Movements of soil, vibrations (foundations of machines, bridges), frozen earth,

Idl The method of laying and the bedding material have to be selected in respect of the outer cable sheath to avoid mechanical damages.

lei Protection against outer influence, e.g. oils and chemical solvents.

If) When the cable is handled at low temperatures, there may be a risk of damage io the cable. This must be taken into account if the cable laying b to bo made dose to the lower temperature Kmiis, and it should be remembered that the thermal time constant for the fijl cable drum may bo as high as 20 to 30 hours.

See atao sub-ciause 5.2.

Cables shall be immediately protected against mechanical damage occurring after іпаіаіівгіогк Cable trenches shall be filed without delay after cable* have been Wd.

Cables laid In the ground are considered a* being sufficiently mechanically protected. H appropriate regulation* and law* concerning laying depth In ground, protection, mapping and service ere foDowed,

The laying depth *n ground shall be according to the relevant national regulations.

The inner and curvature ttiameter of pipes has to be chosen so that friction against the cable does not lead to a risk of cable damage. The minimum diameter for the pipe of at least 1.5 times the cable outer diameter is preferred. The minimum bonding radius for the cable has to be taken into account when choosing pipe*.

In case of several cables within one pipe the diameter of the pipe ha* to be sufficiently wide to prevent cable blockage,

If single core cables are laid through magnetic metallic pipes or tight steel construction!, all cables belonging to the same system have to pass through the seme pipe or hole in the construction.

While laying single core cables for parallel cable systems the current how between single cables tn the same phase has to be checked after installation to avoid the overloading of single cable. The difference In current between single corse has to follow the appropriate regulations and laws.

Il it recommended to protect th* pipe with sand against chocking.

The cable* shall be installed in such a way that the spread of fire and ft* consequences are limited. The relevant specifications, regulation* and laws, especialy those for preventative fire protection, shall be taken into account.

The possible thermal effect of fire stop* on the currant loading of the cable ha* to be taken into account.

5,2 Lowest permitted installation temperature

The k>west allowed temperature of the cable* during і ns tala t ion and mounting of accessories is normally:

'15°C for XLPE'insuiated or vulcanised EPft-rubber compound insulated and halogen-free thermoplastic polymer compound sheathed fre retardant IkV power cable*.

The temperature applies to the cable itself and not the surroundings. И the cable ha* a lower temperature than ptrmrttod, it has to be preheated.

Care has to be taken that the cable temperature remain* above the lowest permitted value during the whole laying operation.5.3 PuUino toads

5.3 4 РчЙфО-Ьу pu^no-head

For pufttog to of cables by means of a pulling-head attached to the conductors, the foiowtog maximum values for the pulling tons tie forces are aftowed:

(a) For cables with copper conductors tf = 50 N/mrn¹ lb) For cables with aluminium conductors 4 - 15 N/mm* let The maximum permitted pul Eng force for ail cables Ins 20,000 N.

With these pulling forces the conductors do not exceed the maximum permitted elongation. The maximum pulling force is calculated from the nominal sum of cross- sections of the inner conductors. The cross-section of the screens, concentric conductors shaft not be considered.

I ho formula for the calculation of the maximum puOtog force is:

F -AU where

F ta fa Newtons IN) A is to square miltonetres {men*) 4 is to N/mm*

For puffing in of cables without a metallic covering, having polymeric insulation and sheath, the puling tores can be transmitted by > pulling stocking via a frictional contact between stocking and cable.

The maximum forces allowed while using a puling stocking are:

(a) For cables with copper conductors J « 20 N/mm⁴ lb) For cables with aluminium conductors 6 « 15 N/mm’ (d The maximum permitted pulling force for all cables tt 20,000 N.

Cables may be laid aka by mesas q( a plough. In such cam mantf recommendations should ba followed.

For the simultaneous laying of the cables the pulling forces given in sub-clauses 6.3.1 and 5.3.2 are valid depending on the pulling method. The maximum allowable forces for the single cable shall not be exceeded. Care has to be taker especially to deep route turns.

It is assumed that the cobfe route is well designed tor the laying procedure with wall established curves and a sufficient number of cable rollers. Spacial attention shall be paid to the required minimum bonding radii I see sub-clause 6.4). The pufting forces shall be permanently supervised during the pull-in procedure.

The walla of the cable trench shal be tight enough so that during роЖлд operations, no damage ihail be caused to the cable surface by stones or hard gravel scratching or falling on the cable.

5.4 Bendina radius

During insxatlatton the bonding radius shall not fall below the fobowing valuta;

{al Single core polymer compound sheathed cables, 15 times the cable diameter

(b) Multi-core polymer compound sheathed cabtea. 12 times the cable diameter.

6.4.2 Final values

In the final bending, rf made carefully and smoothly as a single bend in one direction only and left in the final position, the minimum bending radius values calculated in sub- dauso 5.4.1 may be reduced by 30%.SECTION J: CABLES WITH ADDITIONAL OR AMENDED REQUIREMENTS FOR
QXY GEN-IND EX TESTING OF MATERIALS