Contact our Technical Sales team on +44 (0) We will be happy to answer any ques ons or help with product selec on

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1 77 WIRIG REGULATIO st Amendment implemented st January 0 KEY ECTIO Chapter 44 Voltage disturbances and electromagne c disturbances ec on 44 rotec on against over voltages of atmospheric origin or due to switching Chapter rotec on, Isola on, witching, Control and Monitoring ec on 4. elec on and erec on of surge protec on devices urge rotec on Devices () and the 7 th Edi on st Amendment of 77 Wiring Regula ons urge rotec on devices available from DEM Manufacturing (branded Roxburgh EMC) have for many years offered market leading protec on from damage caused by high energy short dura on electrical transients. These are typically caused by nearby electrical storms (atmospheric origins) or the switching of induc ve, capaci ve and resis ve loads (switching origin). Transients can cause a variety of problems from equipment failure to serious electrical fires and damage to distribu on systems. urge rotec on Devices have historically not been covered by 77 Wiring Regula ons, despite the vital role they can play in protec ng electrical and electronic equipment. However, this has now changed with the recently published first amendment implemented st January th Edi on, Chapter 44 relates to protec on against Voltage Disturbances and Electromagne c Disturbances. ec on 44 deals specifically with protec on against over voltages of atmospheric origin or due to switching. Details are given as to the types of installa ons where the risk assessment will always lead to the result that is required and other areas with lower levels of consequences where calcula ons can be used to determine the need for installa on. ee specifically Chapter deals with protec on isola on, switching, control and monitoring with 4. determining specifically the selec on and erec on of surge protec on devices. Two specific types of are referred to in the regula ons as Type and Type dependant on the nominal discharge currents expected and the loca on of the protec on within the system. DEM s urge rotec on Devices meet E 4 and DEM s class (DV series) meet Type and DEM class C (DVC series) urge rotec on Devices meet Type specifica ons as referred to in chapter. 7 th Edi on st Amendment urge rotec on Devices Roxburgh Item ystem upply Appendix Diagram Type/Type DVC40044T TT connec on Type hase + eutral A Type DVC40044TT TT connec on Type hase + eutral A Type DVC4004TC IT hase A4 Type DV4004T T C hase + eutral A Type DVC40044T T C hase + eutral A Type DVC74T T C ingle hase A Type Contact our Technical ales team on +44 (0) 74 7 We will be happy to answer any ques ons or help with product selec on, Hargreaves Way, awcliffe Industrial ark, cunthorpe, orth Lincolnshire. D 8RF Tel: +44 (0) sales@dem uk.com uk.com/roxburgh

2 Tel o. +44(0)74 7 Hargreaves Way, awcliffe Ind. ark, cunthorpe, orth Lincolnshire, D 8RF, UK art o: DVC40044T IUE UMER 0 DVC40044T urge rotection Device recommended for use with TT systems, connection Type (CT ) connected to the load side of an RCD according to regulation 4..(i) OCD I L L L rotective Conductor OCD 4b 4a :. Distribution board. Main earthing terminals or bar. urge protective devices ensuring a protection level in accordance with overvoltage Category II 4. Earthing connection of surge protective devices, either 4a or 4b, whichever is the shorter route. Current-using equipment. Residual current protective device (RCD) OCD : at the origin of the installation OCD : >A gl A gl Min. recommended cross section mm² 04/04/0 0/04/0

3 Tel o. +44(0)74 7 Hargreaves Way, awcliffe Ind. ark, cunthorpe, orth Lincolnshire, D 8RF, UK art o: DVC40044TT IUE UMER 0 urge rotection Device recommended for use with TT systems connection type (CT) connected to the load side of an RCD according to regulation 4..(ii) OCD L L L I rotective Conductor OCD 4b a 4a :. Distribution board. Main earthing terminals or bar. urge protective devices a. urge protective devices (s and a in series ensuring a protection level in accordance with overvoltage Category II. 4. Earthing connection of surge protective devices, either 4a or 4b, whichever is the shorter route. Current-using equipment. Residual current protective device (RCD) installed downstream of the surge protective devices OCD : OCD : at the origin of the installation >A gl A gl Min. recommended cross section mm² 0/04/0 4/04/0

4 Tel o. +44(0)74 7 Hargreaves Way, awcliffe Ind. ark, cunthorpe, orth Lincolnshire, D 8RF, UK art o: DVC4004TC IUE UMER 0 urge rotection Device recommended for use with IT systems OCD I L L L rotective Conductor z OCD 4b 4a Distribution board Main earthing terminals or bar urge protective devices ensuring a protection level in accordance with overvoltage Category II Earthing connection of surge protective devices, either 4a or 4b, whichever is the shorter route Current-using equipment Residual current protective device (RCD) OCD : OCD : at the origin of the installation >A gl A gl Min. recommended cross section mm² 0/04/0 4/04/0

5 Tel o. +44(0)74 7 art o: Hargreaves Way, awcliffe Ind. ark, cunthorpe, orth Lincolnshire, D 8RF, UK T-C- YTEM 0 IUE UMER Installation of types, and s for example in T-C- systems ource ee note 4 Installation ee note OCD 9 OCD 4 L 9 L L E E OCD OCD : : Distribution board Distribution outlet Main earthing terminal or bar urge protective device, DV4004T (Type ) Earthing connection (earthing conductor) of surge protective device fixed equipment to be protected urge protective device, DVC40044T (Type ) urge protective device, DVC74T (Type or Type ) Decoupling element or line length 8: OTE : for further information reference should be made to CLC/T4- OTE : s 4 & 7 (or 7 & 8) can be combined in a single OTE : s may require additional modes of protection for sensitive equipment OTE 4: E 0-4 covers the protection of electrical and electronic systems within structures against lightning. OTE : ection 44 of 77 deals with the protection of electrical installations against transient overvoltages of atmospheric origin, transmitted by the supply distribution system and against switching overvoltages generated by the equipment within the installation 0/04/0 4/04/0

6 Tel o. +44(0)74 7 Hargreaves Way, awcliffe Ind. ark, cunthorpe, orth Lincolnshire, D 8RF, UK art o: T-C- YTEM IUE UMER 0