Cables and Accessories for Low Voltage

INDEX
low voltage index

USER GUIDE ... 5
– Suggested usual applications for LV cables... 6
– Afumex solutions for Electrotechnical Regulation on LV... 8
– Examples of applying Afumex Firs (AS+) in public places... 10
– Types of Prysmian cables for Low Voltage... 12
TECHNICAL INTRODUCTION... 15
A) Interior or receiving installations ... 17
– Installation modes ... 17
– Maximum allowable current for installations in buildings ... 22
– Correction factors ... 24
B) Overhead networks for distribution or exterior lighting at Low Voltage .................................................................................................. 29
– Maximum allowable current ... 29
– Correction factors ... 31
C) Underground networks for distribution at Low Voltage (according to UNE 211435 standard) ............................................................... 32
– Maximum allowable current ... 32
– Correction factors ... 32
C bis) Underground networks for distribution at Low Voltage (according to Spanish Electrotechnical Regulation for
Low Voltage REBT)... 36
Cables buried directly or in a tube ... 36
– Maximum allowable current ... 37
– Correction factors ... 38
Cables installed in underground galleries ... 39
– Maximum allowable current ... 40
– Correction factors ... 40
D) Calculation of intensity of current ... 42
E) Calculation of the section by voltage drop ... 43
– Form... 43
– Maximum allowable voltage drops in % according to the Electrotechnical Regulation for Low Voltage ........................................................ 45
– Voltage drop tables ... 46
F) Maximum short-circuit current ... 48
G) Examples of LV section calculations ... 50
– Power line in residential building ... 50
– Individual branch in residential building ... 51
– Lift in a shopping centre ... 53
H) Radius of curvature ... 57
I) Maximum traction voltage during cable laying ... 59
J) Most frequent errors in calculating sections and choice of cable ... 60
K) Solution to special and frequent situations ... 71
L) Fire tests ... 87
– Regulations depending on the behaviour of cables in fire... 90
M) New aluminium cable for LV Al Voltalene Flamex (S).
Characteristics in comparison with traditional design Al Voltalene N (AL RV) .................................................................................... 91
N) Section calculations for open lines with uniform section ... 93
O) Energy efficiency. Example of calculation of an economic section and "environmental payback" .................................................. 95
P) Example of calculation of a technical and economic section of a conductor in a photovoltaic installation.
"Environmental payback" ... 101

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