Comments on: Commonly used AC voltage levels

By: Tomi Engdahl

Tomi Engdahl — Mon, 22 Dec 2025 22:45:40 +0000

Pienoisjännitteellä (vanhempi nimitys suojajännite) tarkoitetaan tasajännitettä (DC) 120 volttiin asti ja vaihtojännitettä (AC) 50 volttiin asti. Tukesin mukaan pienoisjännite (suojajännite) on enintään 50 V vaihtojännitettä (VAC) tai 120 V tasajännitettä (VDC), ja se tuotetaan erillisellä muuntajalla verkkovirrasta, mikä tekee laitteista turvallisia koskettaa, koska ne ovat luokkaa III ja toimivat niin matalalla jännitteellä. Pienoisjännitteisiä laitteita, kuten monia koristevaloja, saa asentaa ja korjata itse ilman ammattilaisen pätevyyttä. Jännite, joka on niin pieni (max 50 VAC / 120 VDC), ettei se aiheuta hengenvaaraa. Pienoisjännite tunnetaan määräyksissä ja standardeissa nimellä ELV (Extra Low Voltage). IEC 61140 ja IEC 60364-4-41 määrittelevät ELV:n yleensä alle 50 V AC:ksi tai 120 V DC:ksi (rippeleetön).

By: Tomi Engdahl

Tomi Engdahl — Wed, 17 Dec 2025 23:32:21 +0000

Three phase 600v in Canada

By: Tomi Engdahl

Tomi Engdahl — Wed, 17 Dec 2025 23:31:59 +0000

480V three-phase power in North America (US/Canada) developed around similar times as European 380-400V, both emerging from early AC systems, with 480V becoming standard for US industrial/commercial use (60Hz) while Europe settled on 380V (later harmonized to 400V at 50Hz),

By: erica

erica — Wed, 12 Nov 2025 07:10:32 +0000

FG7H1OAR Cable is a European standard medium-voltage mining power cable rated at 8.7/15kV and 12/20kV, featuring HEPR insulation, PVC inner and outer sheaths, and steel wire braided armor.

By: erica

erica — Fri, 24 Oct 2025 09:01:30 +0000

658TQ Type SW4 Cable is a British Standard armored cable rated at 0.6/1kV. For conductor cross-sections ranging from 1.0mm² to 1.5mm², the conductor consists of Class 2 or Class 5 tinned copper wire; For cross-sections of 2.5mm² and above, Class 2 tinned copper wire is used. It features EPR insulation, galvanized steel wire braided armor, and an HOFR sheath.

By: erica

erica — Tue, 16 Sep 2025 04:17:42 +0000

Power cables are classified according to voltage.

By: dylan

dylan — Mon, 28 Jul 2025 04:23:10 +0000

N2XY Cable is a low-voltage (0.6/1 kV) power cable commonly used for energy distribution in stationary installations.

By: Tomi Engdahl

Tomi Engdahl — Mon, 29 Jul 2024 13:12:37 +0000

Look at this amplifier powering an amplifier
https://youtu.be/3AYJBUaT74Q?si=lP-ZHFqK_zc50U3R

By: Tomi Engdahl

Tomi Engdahl — Thu, 04 Jul 2024 15:19:24 +0000

Mike Metzger
The International Electrotechnical Commission (IEC) and the UK IET (BS 7671:2008) define an ELV device or circuit as one in which the electrical potential between two conductors or between an electrical conductor and earth (ground) does not exceed 120 volts (V) for ripple-free direct current (DC) or 50 VRMS (root mean square volts) for alternating current (AC).
In more arduous conditions, 25 VRMS alternating current or 60 V (ripple-free) DC can be specified to further reduce hazard. Lower voltage can apply in wet or conductive conditions where there is even greater potential for electric shock.
https://en.m.wikipedia.org/wiki/Extra-low_voltage

By: Tomi Engdahl

Tomi Engdahl — Thu, 04 Jul 2024 15:18:34 +0000

The International Electrotechnical Commission (IEC) and the UK IET (BS 7671:2008) define an ELV device or circuit as one in which the electrical potential between two conductors or between an electrical conductor and earth (ground) does not exceed 120 volts (V) for ripple-free direct current (DC) or 50 VRMS (root mean square volts) for alternating current (AC).