JIS C 5381-12:2014

Introduction1 Scope2 Normative references3 Definitions 3.1 surge protective device (SPD) 3.2 continuous operating current (I[c]) 3.3 maximum continuous operating voltage (U[C]) 3.4 voltage protection level (U[p]) 3.5 measured limiting voltage 3.6 residual voltage (U[res]) 3.7 temporary overvoltage (U[T]) 3.8 temporary overvoltage of the network (U[TOV]) 3.9 nominal discharge current (I[n]) 3.10 impulse current (I[imp]) 3.11 combination wave 3.12 8/20 current impulse 3.13 1.2/50 voltage impulse 3.14 thermal runaway 3.15 thermal stability 3.16 SPD disconnector 3.17 type tests 3.18 routine tests 3.19 acceptance tests 3.20 degrees of protection provided by enclosure (IP code) 3.21 voltage drop (in per cent) (delta U) 3.22 insertion loss 3.23 load-side surge withstand capability for a two prt SPD 3.24 short-circuit withstand 3.25 one-port SPD 3.26 two-port SPD 3.27 voltage switching type SPD 3.28 voltage limiting type SPD 3.29 combination type SPD 3.30 modes of protection 3.31 follow current (I[f]) 3.32 maximum discharge current (I[max]) for class 2 test 3.33 degradation 3.34 residual current device (RCD) 3.35 nominal voltage of the system 3.36 impulse test classification 3.37 rated load current (I[L]) 3.38 backup Overcurrent protection 3.39 maximum continuous operating voltage of the power system at the SPD location (U[cs]) 3.40 sparkover voltage of a voltage-switching SPD 3.41 lightning protection system (LPS)4 Systems and equipment to be protected 4.1 Low-voltage power distribution systems 4.2 Characteristics of the equipment to be protected5 Surge protective devices 5.1 Basic function of SPDs 5.2 Additional requirements 5.3 Classification of SPDs 5.4 Characteristics of SPDs 5.5 Additional information on characteristics of SPDs6 Application of SPDs in low-voltage power distribution systems 6.1 Installation and its effect on the protection given by SPDs 6.2 Selection of SPD 6.3 Characteristics of auxiliary devices7 Risk analysis8 Co-ordination where equipment has both signaling and power terminalsAnnex A (informative) Typical information given with inquiries and tenders and explanation of testing proceduresAnnex B (informative) Examples of relationship between U[c] and the nominal voltage used in some systems and example of relationship between U[p] and U[c] for ZnO varistorAnnex C (informative) Environment 0 Surge voltages in LV systemsAnnex D (informative) Partial lightning current calculationsAnnex E (informative) TOV in the low voltage system due to faults between high-voltage systems and earthAnnex F (informative) Co-ordination rules and principlesAnnex G (informative) Examples of applicationAnnex H (informative) Examples of application of the risk analysisAnnex I (informative) System stressesAnnex J (informative) Criteria for selection of SPDsAnnex K (informative) Application of SPDsAnnex L (informative) Risk analysisRelated standards and bibliographyFiguresTables

Defines the principles for selection, operation, location and co-ordination of SPDs to be connected to 50 Hz to 60 Hz a.c. and to d.c. power circuits and equipment rated up to 1000 V r.m.s. or 1500 V d.c.

2014 [20/06/2014]2004(R2009) [01/10/2009]2004 [20/03/2004]