---

Clause numbers refer to this section unless otherwise stated.Table 3 (concluded) ' Schedule of tests

Clause numbers refer w the sect юл unless otherwise stated,

Table 4 - Conductor Data and button TMetaws

NOTES: U For cables having copper conductors of nominal cross-stcbonal area I mm¹. the order shat be specified И the conductors are plain or tinned,

21 For cables having copper conductors of all other nominal cross-sectional areas, the conductors shal be not tinned,APPENDIX A

GUIDE TO USE

Al.

This Appendix it valid for the л ppi teat юл of cablet according to HD 604 Pan 4 Section 8.

A2. QiMMt

The Object of this Appendix it to provide an example of recommendations for the selection, storage, transport and installation of the cables specified under item A1. Scope. These recommendations are not exhaustive, others may be used,

A3. Recommendations for use

A3 J Permissible application

The cables considered are mainly intended for use indoors, laid on cable trays, in nuclear power generating plants.

All these cables may be used inside containment of nuclear power stations when they comply with additional tests and requirements not specified here, special/ to demonstrate that they are capable of performing their specified functions under accident and post-accident conditions.

A3,2 Environmental conditions П

When these cables are used in nuclear power stations, outskte containment, the environmental influences to be taken kito account for cables are, unden

* storage/ installation conditions - normal conditions

A3.2 J Storage/ installation conditions

These conditions apply to all cables in storage or in the course of installation, located outdoors and in unprotected premises.

(’I Excerpt from "Design and Construction Rules for Electrical Equipment of Nuclear Islands (RCC-ЕГ, published by "Association francaise pour les rigles de conception et de construction des matdnds des chauMres ilecuo-nuc Makes, (AFCENK, chapter D 2200.

A3.2.2 Normal environmental conditions lomskte containment!

These condrtktris apply to installed cables, whether in service or idle, the power station bemg either m operation or shut down and ere given in the table on the nest page.

Note: Q * 10 ms²

(H vibrations are constant amplitude up to the Transition frequency of 57 Hz and constant acceferatwt above chat frequency.A4. Reowrementfi САлееппіпд the si ли о of nnwercabies П

Cable* are sized on the following ba&is:

’ The cable ts able to carry permissible steady-state current. This current which is given in the cable specification, depends on such factors as ambient temperature, cable construe ton and routing, This leads to a temperature rise in steady-state operation.

The cable is capable o1 withstanding a faulty current whch may occur, without deterioration- h sustains a conductor temperature rise appreciably higher than that occurring under continuous load. The temperature rise depends essentially on the type of cable insulation used. Effects of short- circuits between cable ends are not taken into accoint in sizing cables (it is assumed that the cable is simply replaced!.

The ca Ые does not produce an excessive voltage drop between the power source and the load, under steady-stale conditions or during motor startup. The cable cross-section is selected so that the voltage at the motor terminals is 0.8 Un when bus voltage »s at the lower Emit of the normal range.

Nou: In practice and depending on the intended service, each cable may be sized on the basts of only one of the above criteria,

Ambient temperature is taken into account as follows:

• M a general rule, an ambient temperature of 90 *C is adopted for those cables supplying equipment which can be de-energised in the event of a general loss of air-conditioning which, sooner or later leads to plant shutdown;

• a higher temperature may be adopted for cables supplying equipment which is necessary in the event of a general loss of ventilation and, in рапмміаг, those cables which arg necessary for sir- conditioning equipment;

• however, overheating of cables is acceptable for short periods since this has only a minor effect on service life;

A5 Separation rules between cables of different electrical types (“1

The purpose of the separation between cables of different electrical types is to protect the various electrical circuits from electromagnetic interference*

The rules described below concern all cables.

ҐІ Excerpt from 'Design and Construction Rules for Electrical Equipment of huclaar Islands (RCC-E)' published by "Association franchise pour les regies de conception et de construction des materiels des chmxMres tlectro-nud tores, IA FC ENT, chapter C 2242.

("I Excerpt from (RCC-EL chapter D 7313

The following electrical types can be distinguished;

- medium voltage power,

low voltage power,

utility I telephone, Intercom, public address system, lighting. etc J.

control,

instrument.

The separation criterion taken into account is the vohaga level and the nature of the signals.

The routings era normally overhead; the following methods may be used,

A5,1 Overhead routings

In Che same raceway, the cable trays are assigned in the following way:

cables of different types are routed on different cable trays or risers,

• on horizontal or diagonal raceways, the cable trays assigned to power cables are located in the upper pan and the order of assignment of the cable trays complies with figure 1,

• the control and low vohage power cables may run on the same tray in secondary raceways (see sub-dau» A7.2h

• instrument cables am through enclosed troughs when a power cable IMV oc LVI passes less than 1 m away,

• instrument cables transmitting signals output by nuclear instrumentation system detectors, or signals of comparable level, pass through enclosed troughs These Instrument cables can also transmit the HV specific to the detector power supply-

The mmimwn distances to be respected between the cable tray* carrying cables of different elactncai types are |see figure 2K

.di a 0.1 Б m. when the cable trays are paraKei and stacked,

d2 2: OJO m, when the cable trays cross in separate planes,

.43 a 0-10 m, when die cable trays are parallel on the same horizontal plane.

These distances presuppose that the instrument cables pass through enclosed troughs.KV pO*er

IV poer

Utility

Control

Instrument

F

FIGURE 2 - SEPARATION DISTANCE BETWEEN CABLE TRAYS

IGURE 1 - POSITIONING OF CABLE TRAYS CORRESPONDING
TO THE VARIOUS TYPES OF CABLES

A6.

Ree

«ТПТІЇТЦТ

datiocia for storage and transport

A6.1 C^fiiYfliy

The distance between the outer cable layer of a fdled-up cable delivery drum and the head of the flange shall be sufficiently high to avoid damages of the cable-

A6.2 Cable end sealing

Each cable end shall be fitted with suitable end devices to prevent ingress of humidity during storage_tdelivery and laying.

A6.3 Transport

For the transport of fi№d up cable reels, only suitable carriers shall be used.

Cable drums with flange diameters exceeding Im have to be transported with the drum-axis in a horizontal position. The drums have to be protected against movement, loading and unloading shall be made by tunable devices to avoid damage to the cables and the cable drums,

Filledup cable drums shall be rolled only short distances over plain solid ground in the direction indicated The cable ends have to be tightened.

A7. Recommend at киї з for cable lavew and installation

A7.1 gullino in and bending raoius

Pulling in of cables is made either manually, or mechanically.

In the case of mechanically pulhng in;