# Voltformer Country Electrical Engineering Profiles

> 151 country profiles covering grid frequency, transmission and distribution voltages, transformer project candidates, standards, efficiency regulation, operators, climate design basis, applications and mandatory verification items. Country-level values are preliminary references, not a substitute for project-specific utility data.

- [Albania](https://voltformer.com/country-profile/albania.md): ISO AL; 50 Hz; grid voltage candidates 35/20/10/6/400/220/110 kV; LV 400/230 V
- [Algeria](https://voltformer.com/country-profile/algeria.md): ISO DZ; 50 Hz; grid voltage candidates 30/10/400/220/60 kV; LV 400/230 V
- [Angola](https://voltformer.com/country-profile/angola.md): ISO AO; 50 Hz; grid voltage candidates 30/15/10/400/220/110/60 kV; LV 400/230 V
- [Argentina](https://voltformer.com/country-profile/argentina.md): ISO AR; 50 Hz; grid voltage candidates 33/13.2/500/220/132 kV; LV 380/220 V
- [Armenia](https://voltformer.com/country-profile/armenia.md): ISO AM; 50 Hz; grid voltage candidates 35/10/6/400/220/110 kV; LV 400/230 V
- [Australia](https://voltformer.com/country-profile/australia.md): ISO AU; 50 Hz; grid voltage candidates 33/22/11/6.6/500/330/275/220/132/66 kV; LV 415/240 V
- [Austria](https://voltformer.com/country-profile/austria.md): ISO AT; 50 Hz; grid voltage candidates 30/20/10/380/220/110 kV; LV 400/230 V
- [Azerbaijan](https://voltformer.com/country-profile/azerbaijan.md): ISO AZ; 50 Hz; grid voltage candidates 35/10/6/500/330/220/110 kV; LV 400/230 V
- [Bahamas](https://voltformer.com/country-profile/bahamas.md): ISO BS; 60 Hz; grid voltage candidates 13.2/11/7.2/132/69/33 kV; LV 480/240/208/120 V
- [Bahrain](https://voltformer.com/country-profile/bahrain.md): ISO BH; 50 Hz; grid voltage candidates 33/11/400/220/66 kV; LV 400/230 V
- [Bangladesh](https://voltformer.com/country-profile/bangladesh.md): ISO BD; 50 Hz; grid voltage candidates 33/11/400/230/132 kV; LV 400/230 V
- [Barbados](https://voltformer.com/country-profile/barbados.md): ISO BB; 50 Hz; grid voltage candidates 11/3.3/69/33/24 kV; LV 400/230/200/115 V
- [Belgium](https://voltformer.com/country-profile/belgium.md): ISO BE; 50 Hz; grid voltage candidates 36/15/11/380/220/150/70 kV; LV 400/230 V
- [Bhutan](https://voltformer.com/country-profile/bhutan.md): ISO BT; 50 Hz; grid voltage candidates 33/11/400/220/132/66 kV; LV 415/240 V
- [Bolivia](https://voltformer.com/country-profile/bolivia.md): ISO BO; 50 Hz; grid voltage candidates 24.9/14.4/10/230/115/69 kV; LV 380/220 V
- [Bosnia and Herzegovina](https://voltformer.com/country-profile/bosnia-and-herzegovina.md): ISO BA; 50 Hz; grid voltage candidates 35/20/10/400/220/110 kV; LV 400/230 V
- [Botswana](https://voltformer.com/country-profile/botswana.md): ISO BW; 50 Hz; grid voltage candidates 33/11/400/220/132 kV; LV 400/230 V
- [Brazil](https://voltformer.com/country-profile/brazil.md): ISO BR; 60 Hz; grid voltage candidates 34.5/13.8/11.4/765/500/230/138 kV; LV 380/220/127 V
- [Brunei](https://voltformer.com/country-profile/brunei.md): ISO BN; 50 Hz; grid voltage candidates 33/11/66 kV; LV 415/240 V
- [Bulgaria](https://voltformer.com/country-profile/bulgaria.md): ISO BG; 50 Hz; grid voltage candidates 20/10/6/400/220/110 kV; LV 400/230 V
- [Burkina Faso](https://voltformer.com/country-profile/burkina-faso.md): ISO BF; 50 Hz; grid voltage candidates 33/20/15/225/132/90 kV; LV 400/230 V
- [Cambodia](https://voltformer.com/country-profile/cambodia.md): ISO KH; 50 Hz; grid voltage candidates 22/10/230/115 kV; LV 400/230 V
- [Cameroon](https://voltformer.com/country-profile/cameroon.md): ISO CM; 50 Hz; grid voltage candidates 30/15/10/225/110/90 kV; LV 400/230 V
- [Canada](https://voltformer.com/country-profile/canada.md): ISO CA; 60 Hz; grid voltage candidates 25/13.8/12.47/4.16/735/500/230/161/138/115/69 kV; LV 600/347/208/120 V
- [Chile](https://voltformer.com/country-profile/chile.md): ISO CL; 50 Hz; grid voltage candidates 23/13.8/12/500/220/110/66 kV; LV 380/220 V
- [China](https://voltformer.com/country-profile/china.md): ISO CN; 50 Hz; grid voltage candidates 35/20/10/6/1100/1000/750/500/330/220/110 kV; LV 400/230 V
- [Colombia](https://voltformer.com/country-profile/colombia.md): ISO CO; 60 Hz; grid voltage candidates 34.5/13.8/11.4/500/230/115 kV; LV 208/120 V
- [Costa Rica](https://voltformer.com/country-profile/costa-rica.md): ISO CR; 60 Hz; grid voltage candidates 34.5/13.8/230/138 kV; LV 480/208/120 V
- [Croatia](https://voltformer.com/country-profile/croatia.md): ISO HR; 50 Hz; grid voltage candidates 35/20/10/400/220/110 kV; LV 400/230 V
- [Cyprus](https://voltformer.com/country-profile/cyprus.md): ISO CY; 50 Hz; grid voltage candidates 22/11/132/66 kV; LV 400/230 V
- [Czech Republic](https://voltformer.com/country-profile/czech-republic.md): ISO CZ; 50 Hz; grid voltage candidates 35/22/10/400/220/110 kV; LV 400/230 V
- [Democratic Republic of the Congo](https://voltformer.com/country-profile/democratic-republic-of-the-congo.md): ISO CD; 50 Hz; grid voltage candidates 30/20/15/6.6/500/400/220/132 kV; LV 400/230 V
- [Denmark](https://voltformer.com/country-profile/denmark.md): ISO DK; 50 Hz; grid voltage candidates 60/20/10/400/220/150/132 kV; LV 400/230 V
- [Dominican Republic](https://voltformer.com/country-profile/dominican-republic.md): ISO DO; 60 Hz; grid voltage candidates 12.47/7.2/4.16/138/69 kV; LV 480/208/120 V
- [Ecuador](https://voltformer.com/country-profile/ecuador.md): ISO EC; 60 Hz; grid voltage candidates 22.8/13.8/6.3/500/230/138 kV; LV 220/127 V
- [Egypt](https://voltformer.com/country-profile/egypt.md): ISO EG; 50 Hz; grid voltage candidates 22/11/500/220/132/66 kV; LV 380/220 V
- [El Salvador](https://voltformer.com/country-profile/el-salvador.md): ISO SV; 60 Hz; grid voltage candidates 23/13.2/4.16/230/115 kV; LV 480/240/208/120 V
- [Estonia](https://voltformer.com/country-profile/estonia.md): ISO EE; 50 Hz; grid voltage candidates 35/20/10/6/330/110 kV; LV 400/230 V
- [Ethiopia](https://voltformer.com/country-profile/ethiopia.md): ISO ET; 50 Hz; grid voltage candidates 33/15/500/400/230/132/66 kV; LV 380/220 V
- [Fiji](https://voltformer.com/country-profile/fiji.md): ISO FJ; 50 Hz; grid voltage candidates 11/6.6/132/33 kV; LV 415/240 V
- [Finland](https://voltformer.com/country-profile/finland.md): ISO FI; 50 Hz; grid voltage candidates 20/10/400/220/110 kV; LV 400/230 V
- [France](https://voltformer.com/country-profile/france.md): ISO FR; 50 Hz; grid voltage candidates 20/15/400/225/90/63 kV; LV 400/230 V
- [Gabon](https://voltformer.com/country-profile/gabon.md): ISO GA; 50 Hz; grid voltage candidates 20/15/5.5/225/90/63 kV; LV 400/230 V
- [Georgia](https://voltformer.com/country-profile/georgia.md): ISO GE; 50 Hz; grid voltage candidates 35/10/6/500/220/110 kV; LV 400/230 V
- [Germany](https://voltformer.com/country-profile/germany.md): ISO DE; 50 Hz; grid voltage candidates 30/20/10/380/220/110 kV; LV 400/230 V
- [Ghana](https://voltformer.com/country-profile/ghana.md): ISO GH; 50 Hz; grid voltage candidates 34.5/33/11/330/161/69 kV; LV 400/230 V
- [Greece](https://voltformer.com/country-profile/greece.md): ISO GR; 50 Hz; grid voltage candidates 20/15/6.6/400/150/66 kV; LV 400/230 V
- [Guatemala](https://voltformer.com/country-profile/guatemala.md): ISO GT; 60 Hz; grid voltage candidates 34.5/13.8/4.16/230/69 kV; LV 480/208/120 V
- [Guinea](https://voltformer.com/country-profile/guinea.md): ISO GN; 50 Hz; grid voltage candidates 30/20/15/6.6/225/110 kV; LV 400/230 V
- [Guyana](https://voltformer.com/country-profile/guyana.md): ISO GY; 60 Hz; grid voltage candidates 13.8/69 kV; LV 480/240/120 V
- [Honduras](https://voltformer.com/country-profile/honduras.md): ISO HN; 60 Hz; grid voltage candidates 34.5/13.8/4.16/230/138/69 kV; LV 480/240/208/120 V
- [Hong Kong](https://voltformer.com/country-profile/hong-kong.md): ISO HK; 50 Hz; grid voltage candidates 33/22/11/400/132 kV; LV 380/220 V
- [Hungary](https://voltformer.com/country-profile/hungary.md): ISO HU; 50 Hz; grid voltage candidates 35/20/10/750/400/220/132 kV; LV 400/230 V
- [Iceland](https://voltformer.com/country-profile/iceland.md): ISO IS; 50 Hz; grid voltage candidates 33/19/11/220/132/66 kV; LV 400/230 V
- [India](https://voltformer.com/country-profile/india.md): ISO IN; 50 Hz; grid voltage candidates 33/22/11/6.6/765/400/220/132/66 kV; LV 415/240 V
- [Indonesia](https://voltformer.com/country-profile/indonesia.md): ISO ID; 50 Hz; grid voltage candidates 20/6/500/275/150/70 kV; LV 400/230 V
- [Iraq](https://voltformer.com/country-profile/iraq.md): ISO IQ; 50 Hz; grid voltage candidates 33/11/400/132 kV; LV 400/230 V
- [Ireland](https://voltformer.com/country-profile/ireland.md): ISO IE; 50 Hz; grid voltage candidates 38/20/10/400/220/110 kV; LV 400/230 V
- [Israel](https://voltformer.com/country-profile/israel.md): ISO IL; 50 Hz; grid voltage candidates 33/22/11/400/161 kV; LV 400/230 V
- [Italy](https://voltformer.com/country-profile/italy.md): ISO IT; 50 Hz; grid voltage candidates 20/15/10/380/220/150/132 kV; LV 400/230 V
- [Ivory Coast](https://voltformer.com/country-profile/ivory-coast.md): ISO CI; 50 Hz; grid voltage candidates 33/15/225/90 kV; LV 400/230 V
- [Jamaica](https://voltformer.com/country-profile/jamaica.md): ISO JM; 50 Hz; grid voltage candidates 24/13.8/138/69 kV; LV 415/240/110 V
- [Japan](https://voltformer.com/country-profile/japan.md): ISO JP; 50/60 Hz; grid voltage candidates 33/22/6.6/3.3/500/275/154/66 kV; LV 200/100 V
- [Jordan](https://voltformer.com/country-profile/jordan.md): ISO JO; 50 Hz; grid voltage candidates 33/11/6.6/400/132 kV; LV 400/230 V
- [Kazakhstan](https://voltformer.com/country-profile/kazakhstan.md): ISO KZ; 50 Hz; grid voltage candidates 35/10/6/1150/500/220/110 kV; LV 400/230 V
- [Kenya](https://voltformer.com/country-profile/kenya.md): ISO KE; 50 Hz; grid voltage candidates 33/11/400/220/132/66 kV; LV 415/240 V
- [Kuwait](https://voltformer.com/country-profile/kuwait.md): ISO KW; 50 Hz; grid voltage candidates 33/11/400/300/132 kV; LV 415/240 V
- [Kyrgyzstan](https://voltformer.com/country-profile/kyrgyzstan.md): ISO KG; 50 Hz; grid voltage candidates 35/10/6/500/220/110 kV; LV 400/230 V
- [Laos](https://voltformer.com/country-profile/laos.md): ISO LA; 50 Hz; grid voltage candidates 35/22/500/230/115 kV; LV 400/230 V
- [Latvia](https://voltformer.com/country-profile/latvia.md): ISO LV; 50 Hz; grid voltage candidates 20/10/6/330/110 kV; LV 400/230 V
- [Lebanon](https://voltformer.com/country-profile/lebanon.md): ISO LB; 50 Hz; grid voltage candidates 15/11/220/66 kV; LV 400/230 V
- [Lithuania](https://voltformer.com/country-profile/lithuania.md): ISO LT; 50 Hz; grid voltage candidates 35/10/6/400/330/110 kV; LV 400/230 V
- [Luxembourg](https://voltformer.com/country-profile/luxembourg.md): ISO LU; 50 Hz; grid voltage candidates 20/10/220/110/65 kV; LV 400/230 V
- [Madagascar](https://voltformer.com/country-profile/madagascar.md): ISO MG; 50 Hz; grid voltage candidates 20/10/5.5/138/63/35 kV; LV 400/230 V
- [Malawi](https://voltformer.com/country-profile/malawi.md): ISO MW; 50 Hz; grid voltage candidates 33/11/400/132/66 kV; LV 400/230 V
- [Malaysia](https://voltformer.com/country-profile/malaysia.md): ISO MY; 50 Hz; grid voltage candidates 33/22/11/500/275/132 kV; LV 400/230 V
- [Maldives](https://voltformer.com/country-profile/maldives.md): ISO MV; 50 Hz; grid voltage candidates 11/3.3/132 kV; LV 400/230 V
- [Mali](https://voltformer.com/country-profile/mali.md): ISO ML; 50 Hz; grid voltage candidates 30/20/15/225/150/90 kV; LV 400/230 V
- [Malta](https://voltformer.com/country-profile/malta.md): ISO MT; 50 Hz; grid voltage candidates 11/3.3/220/132/33 kV; LV 400/230 V
- [Mauritania](https://voltformer.com/country-profile/mauritania.md): ISO MR; 50 Hz; grid voltage candidates 33/15/225/90 kV; LV 400/230 V
- [Mauritius](https://voltformer.com/country-profile/mauritius.md): ISO MU; 50 Hz; grid voltage candidates 22/6.6/66 kV; LV 400/230 V
- [Mexico](https://voltformer.com/country-profile/mexico.md): ISO MX; 60 Hz; grid voltage candidates 34.5/23/13.8/400/230/115 kV; LV 480/220/127 V
- [Moldova](https://voltformer.com/country-profile/moldova.md): ISO MD; 50 Hz; grid voltage candidates 35/10/6/400/330/110 kV; LV 400/230 V
- [Mongolia](https://voltformer.com/country-profile/mongolia.md): ISO MN; 50 Hz; grid voltage candidates 35/10/6/220/110 kV; LV 400/230 V
- [Montenegro](https://voltformer.com/country-profile/montenegro.md): ISO ME; 50 Hz; grid voltage candidates 35/20/10/400/220/110 kV; LV 400/230 V
- [Morocco](https://voltformer.com/country-profile/morocco.md): ISO MA; 50 Hz; grid voltage candidates 22/20/5.5/400/225/60 kV; LV 400/230 V
- [Mozambique](https://voltformer.com/country-profile/mozambique.md): ISO MZ; 50 Hz; grid voltage candidates 33/22/11/400/220/110 kV; LV 400/230 V
- [Myanmar](https://voltformer.com/country-profile/myanmar.md): ISO MM; 50 Hz; grid voltage candidates 33/11/6.6/500/230/132/66 kV; LV 400/230 V
- [Namibia](https://voltformer.com/country-profile/namibia.md): ISO NA; 50 Hz; grid voltage candidates 33/22/11/400/220/132/66 kV; LV 400/230 V
- [Nepal](https://voltformer.com/country-profile/nepal.md): ISO NP; 50 Hz; grid voltage candidates 33/11/400/220/132/66 kV; LV 400/230 V
- [Netherlands](https://voltformer.com/country-profile/netherlands.md): ISO NL; 50 Hz; grid voltage candidates 20/10/380/220/150/110 kV; LV 400/230 V
- [New Caledonia](https://voltformer.com/country-profile/new-caledonia.md): ISO NC; 50 Hz; grid voltage candidates 20/15/150/63/33 kV; LV 400/230 V
- [New Zealand](https://voltformer.com/country-profile/new-zealand.md): ISO NZ; 50 Hz; grid voltage candidates 33/22/11/220/110/66 kV; LV 400/230 V
- [Nicaragua](https://voltformer.com/country-profile/nicaragua.md): ISO NI; 60 Hz; grid voltage candidates 24.9/13.8/4.16/230/138/69 kV; LV 480/240/208/120 V
- [Nigeria](https://voltformer.com/country-profile/nigeria.md): ISO NG; 50 Hz; grid voltage candidates 33/11/330/132 kV; LV 415/240 V
- [North Macedonia](https://voltformer.com/country-profile/north-macedonia.md): ISO MK; 50 Hz; grid voltage candidates 35/20/10/400/110 kV; LV 400/230 V
- [Norway](https://voltformer.com/country-profile/norway.md): ISO NO; 50 Hz; grid voltage candidates 22/11/420/300/132/66 kV; LV 400/230 V
- [Oman](https://voltformer.com/country-profile/oman.md): ISO OM; 50 Hz; grid voltage candidates 33/11/400/220/132 kV; LV 415/240 V
- [Pakistan](https://voltformer.com/country-profile/pakistan.md): ISO PK; 50 Hz; grid voltage candidates 11/6.6/500/220/132/66 kV; LV 400/230 V
- [Panama](https://voltformer.com/country-profile/panama.md): ISO PA; 60 Hz; grid voltage candidates 34.5/13.8/4.16/230/115 kV; LV 480/208/120 V
- [Papua New Guinea](https://voltformer.com/country-profile/papua-new-guinea.md): ISO PG; 50 Hz; grid voltage candidates 22/11/132/66 kV; LV 415/240 V
- [Paraguay](https://voltformer.com/country-profile/paraguay.md): ISO PY; 50 Hz; grid voltage candidates 23/13.8/500/220/66 kV; LV 380/220 V
- [Peru](https://voltformer.com/country-profile/peru.md): ISO PE; 60 Hz; grid voltage candidates 22.9/10/4.16/500/220/138/60 kV; LV 380/220 V
- [Philippines](https://voltformer.com/country-profile/philippines.md): ISO PH; 60 Hz; grid voltage candidates 34.5/13.8/13.2/4.16/500/230/138/115/69 kV; LV 480/230 V
- [Poland](https://voltformer.com/country-profile/poland.md): ISO PL; 50 Hz; grid voltage candidates 20/15/400/220/110 kV; LV 400/230 V
- [Portugal](https://voltformer.com/country-profile/portugal.md): ISO PT; 50 Hz; grid voltage candidates 30/15/10/400/220/150/60 kV; LV 400/230 V
- [Qatar](https://voltformer.com/country-profile/qatar.md): ISO QA; 50 Hz; grid voltage candidates 33/11/400/220/132/66 kV; LV 415/240 V
- [Republic of the Congo](https://voltformer.com/country-profile/republic-of-the-congo.md): ISO CG; 50 Hz; grid voltage candidates 30/20/6.6/220/110 kV; LV 400/230 V
- [Romania](https://voltformer.com/country-profile/romania.md): ISO RO; 50 Hz; grid voltage candidates 20/10/6/400/220/110 kV; LV 400/230 V
- [Russia](https://voltformer.com/country-profile/russia.md): ISO RU; 50 Hz; grid voltage candidates 35/20/10/6/750/500/330/220/110 kV; LV 400/230 V
- [Rwanda](https://voltformer.com/country-profile/rwanda.md): ISO RW; 50 Hz; grid voltage candidates 30/15/6.6/220/110/70 kV; LV 400/230 V
- [Samoa](https://voltformer.com/country-profile/samoa.md): ISO WS; 50 Hz; grid voltage candidates 22/6.6/33 kV; LV 415/240 V
- [Saudi Arabia](https://voltformer.com/country-profile/saudi-arabia.md): ISO SA; 60 Hz; grid voltage candidates 33/13.8/11/380/230/132/115/110 kV; LV 400/230 V
- [Senegal](https://voltformer.com/country-profile/senegal.md): ISO SN; 50 Hz; grid voltage candidates 30/6.6/225/90 kV; LV 400/230 V
- [Serbia](https://voltformer.com/country-profile/serbia.md): ISO RS; 50 Hz; grid voltage candidates 35/20/10/400/220/110 kV; LV 400/230 V
- [Sierra Leone](https://voltformer.com/country-profile/sierra-leone.md): ISO SL; 50 Hz; grid voltage candidates 33/11/225/161/66 kV; LV 400/230 V
- [Singapore](https://voltformer.com/country-profile/singapore.md): ISO SG; 50 Hz; grid voltage candidates 22/6.6/400/230/66 kV; LV 400/230 V
- [Slovakia](https://voltformer.com/country-profile/slovakia.md): ISO SK; 50 Hz; grid voltage candidates 22/10/400/220/110 kV; LV 400/230 V
- [Slovenia](https://voltformer.com/country-profile/slovenia.md): ISO SI; 50 Hz; grid voltage candidates 20/10/400/220/110 kV; LV 400/230 V
- [Solomon Islands](https://voltformer.com/country-profile/solomon-islands.md): ISO SB; 50 Hz; grid voltage candidates 11/33 kV; LV 415/240 V
- [South Africa](https://voltformer.com/country-profile/south-africa.md): ISO ZA; 50 Hz; grid voltage candidates 33/22/11/6.6/765/400/275/132/88/66 kV; LV 400/230/525 V
- [South Korea](https://voltformer.com/country-profile/south-korea.md): ISO KR; 60 Hz; grid voltage candidates 22.9/6.6/765/345/154 kV; LV 380/220 V
- [Spain](https://voltformer.com/country-profile/spain.md): ISO ES; 50 Hz; grid voltage candidates 20/15/11/400/220/132/66 kV; LV 400/230 V
- [Sri Lanka](https://voltformer.com/country-profile/sri-lanka.md): ISO LK; 50 Hz; grid voltage candidates 33/11/220/132 kV; LV 400/230 V
- [Sudan](https://voltformer.com/country-profile/sudan.md): ISO SD; 50 Hz; grid voltage candidates 33/11/500/220/110 kV; LV 415/240 V
- [Suriname](https://voltformer.com/country-profile/suriname.md): ISO SR; 60 Hz; grid voltage candidates 33/12.6/6.3/161/69 kV; LV 400/230/220/127 V
- [Sweden](https://voltformer.com/country-profile/sweden.md): ISO SE; 50 Hz; grid voltage candidates 40/20/10/400/220/130 kV; LV 400/230 V
- [Switzerland](https://voltformer.com/country-profile/switzerland.md): ISO CH; 50 Hz; grid voltage candidates 50/20/16/11/380/220 kV; LV 400/230 V
- [Syria](https://voltformer.com/country-profile/syria.md): ISO SY; 50 Hz; grid voltage candidates 20/10/6/400/230/66 kV; LV 400/230 V
- [Taiwan](https://voltformer.com/country-profile/taiwan.md): ISO TW; 60 Hz; grid voltage candidates 22.8/11.4/3.3/345/161/69 kV; LV 380/220/110 V
- [Tajikistan](https://voltformer.com/country-profile/tajikistan.md): ISO TJ; 50 Hz; grid voltage candidates 35/10/6/500/220/110 kV; LV 400/230 V
- [Tanzania](https://voltformer.com/country-profile/tanzania.md): ISO TZ; 50 Hz; grid voltage candidates 33/11/400/220/132/66 kV; LV 400/230 V
- [Thailand](https://voltformer.com/country-profile/thailand.md): ISO TH; 50 Hz; grid voltage candidates 33/24/22/11/500/230/115/69 kV; LV 400/230 V
- [Togo](https://voltformer.com/country-profile/togo.md): ISO TG; 50 Hz; grid voltage candidates 33/20/15/161/66 kV; LV 400/230 V
- [Tonga](https://voltformer.com/country-profile/tonga.md): ISO TO; 50 Hz; grid voltage candidates 11/6.6/22 kV; LV 415/240 V
- [Trinidad and Tobago](https://voltformer.com/country-profile/trinidad-and-tobago.md): ISO TT; 60 Hz; grid voltage candidates 33/12/138/66 kV; LV 480/230/115 V
- [Tunisia](https://voltformer.com/country-profile/tunisia.md): ISO TN; 50 Hz; grid voltage candidates 30/15/10/400/225/90 kV; LV 400/230 V
- [Turkey](https://voltformer.com/country-profile/turkey.md): ISO TR; 50 Hz; grid voltage candidates 34.5/31.5/15.8/10.5/6.3/380/154 kV; LV 400/230 V
- [Turkmenistan](https://voltformer.com/country-profile/turkmenistan.md): ISO TM; 50 Hz; grid voltage candidates 35/10/6/500/220/110 kV; LV 400/230 V
- [Uganda](https://voltformer.com/country-profile/uganda.md): ISO UG; 50 Hz; grid voltage candidates 33/11/220/132 kV; LV 415/240 V
- [Ukraine](https://voltformer.com/country-profile/ukraine.md): ISO UA; 50 Hz; grid voltage candidates 35/10/6/750/330/220/110 kV; LV 400/230 V
- [United Arab Emirates](https://voltformer.com/country-profile/united-arab-emirates.md): ISO AE; 50 Hz; grid voltage candidates 33/11/6.6/400/220/132 kV; LV 400/230 V
- [United Kingdom](https://voltformer.com/country-profile/united-kingdom.md): ISO GB; 50 Hz; grid voltage candidates 33/11/6.6/400/275/132 kV; LV 400/230 V
- [United States](https://voltformer.com/country-profile/united-states.md): ISO US; 60 Hz; grid voltage candidates 34.5/24.94/13.8/13.2/12.47/4.16/765/500/345/230/138/115/69 kV; LV 480/277/208/120 V
- [Uruguay](https://voltformer.com/country-profile/uruguay.md): ISO UY; 50 Hz; grid voltage candidates 31.5/15/6.3/500/150/110 kV; LV 380/220 V
- [Uzbekistan](https://voltformer.com/country-profile/uzbekistan.md): ISO UZ; 50 Hz; grid voltage candidates 35/10/6/500/220/110 kV; LV 400/230 V
- [Vanuatu](https://voltformer.com/country-profile/vanuatu.md): ISO VU; 50 Hz; grid voltage candidates 20/11/5.5 kV; LV 400/230 V
- [Vietnam](https://voltformer.com/country-profile/vietnam.md): ISO VN; 50 Hz; grid voltage candidates 35/22/10/6/500/220/110 kV; LV 400/230 V
- [Yemen](https://voltformer.com/country-profile/yemen.md): ISO YE; 50 Hz; grid voltage candidates 33/11/400/132 kV; LV 400/230 V
- [Zambia](https://voltformer.com/country-profile/zambia.md): ISO ZM; 50 Hz; grid voltage candidates 33/11/330/220/88/66 kV; LV 400/230/550 V
- [Zimbabwe](https://voltformer.com/country-profile/zimbabwe.md): ISO ZW; 50 Hz; grid voltage candidates 33/11/400/330/132/88/66 kV; LV 400/230/380/220 V

Interactive index: https://voltformer.com/country-profiles - machine JSON: https://voltformer.com/country-grid-standards.json