Hi All,
Here is a memo I sent out a while back regarding this issue:
http://www.toruspower.com/MEMO: All USA and Canadian Torus Representatives
SUBJECT: Balanced PowerBased on a recent Internet posting that came to our attention at Torus there appears to be some misunderstanding regarding Balanced Powerline Conditioners.
Torus Power line conditions can operate on a power line input feed of 120 Volt(single phase) or 240 Volt (dual phase). If the 240 Volt version is used then the Torus Powerline Conditioner is BALANCED at the INPUT. The OUTPUT is not balanced and runs Single Phase 120 Volts.
The advantage of operating a Balanced Input or a Balanced Output is noise reduction as a result of the balanced line common mode noise rejection. Given Plitron's proprietary technologies --- “NBT”, “Low-Noise” and “Low Imin” ---Torus Power units have the capability to reduce noise effectively on the output without the need to use Balanced 60V-60V output terminals.
The problem with using Balanced 60/120V. 1-phase AC output on a Consumer Powerline Conditioner are the mandatory requirements demanded by the 2005
USA National Electrical Code – Article 647.
The Balanced 60/120 Volt 1-phase AC mandatory installation requirements are:
1. The system is installed only in commercial or industrial occupancies.
2. All junction box covers shall be clearly marked to indicate the distribution panel and the system voltage.
3. Restricted to areas under close qualified supervision.
Where receptacles are used as a means of connecting equipment, the following conditions shall be met:
1. All 15 ampere and 20 ampere receptacles shall be GFCI protected.
2. All outlet strips, adapters, receptacle covers and faceplates shall be marked with the following words or equivalent:
WARNING - TECHNICAL POWER Do not connect to lighting equipment. For electronic equipment use only.
60/120 V. 1-phase AC GFCI protected.In conclusion if a Torus Powerline Conditioner is used (either 120V Single Phase or 240V Balanced) in a Consumer installation the advantages are:
1. There is no need for use of GFCI protected receptacles.
2. Can be installed in residential as well as commercial and industrial occupancies.
3. Operation of the unit does not require close supervision by qualified personnel.
4. No warning labels required
Regards,
James Tanner