ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#148727 - 10/18/02 09:36 AM TVSS + AC filter Schematics
Scott35 Offline

Broom Pusher and
Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
This thread contains some basic TVSS / Harmonic / RFI-EMI filter schematics.
These setups include MOV Arrays - denoted as MOV(number and letter) along with AC line filters - components denoted as R1 or R2 = Resistors, C1 thru C8 = Capacitors and L1 thru L4 = Inductors.
BTW, "EGC" = Equipment Grounding Conductor. This can be either an Equipment Grounding Conductor or an Isolated Grounding Conductor.

Discussions for these items found in either the Electrical Theory area or the General Discussion area under the topic of:

"TVSS and AC Filter Schematics Discussion"

Here are the drawings!!!

Fig. 1-1: A simple version of 1 phase 2 wire TVSS and filtering for either 60, 120, 208, 240, 277, 480 or 600 VAC 1 phase 2 wire circuits.
For circuits using a Grounded Circuit Conductor - such as 120 VAC and 277 VAC;
"Line 1" = Ungrounded Conductor,
"Line 2" = Grounded Conductor.

Fig. 1-2: Drawing of a "Ganged" set of Two 1 phase 2 wire filters to form a multiwire filter.
This example would be used for 120/240 VAC 1 phase 3 wire circuitry.
"Line 1" and "Line 2" = Ungrounded Conductors,
"Common" = Grounded Conductor.

Fig. 1-3: This drawing shows a basic multipole type filter, which can be used on a variety of systems.
Can be used on 1 phase 3 wire systems of 120/208 VAC, 120/240 VAC, 277/480 VAC and 347/600 VAC which use a Grounded Circuit Conductor.
Also can be used on 3 phase 3 wire systems of 208, 240, 480 and 600 VAC.
"Line 1" and "Line 3" = Ungrounded Conductors,
"Line 2" = Grounded Circuit Conductor - if available, else "Line 2" is also an Ungrounded Conductor.

Fig. 1-4: This is an overview of a Polyphase / Multiwire filter, used on 3 phase 4 wire systems.
This would commonly be used on 3 phase 4 wire Wye systems of 208Y/120 VAC, 480Y/277 VAC and 600Y/347 VAC.
It might even be usable for 120/240 VAC 3 phase 4 wire Delta systems, but I'm not 100% sure.

"Line 1" = Ungrounded Conductor "A",
"Line 2" = Ungrounded Conductor "B",
"Line 3" = Ungrounded Conductor "C",
"Common" = Common Grounded Conductor.

Fig.1-4a and 1-4b below are detailed "Close-ups" of the filter shown in Fig. 1-4

Fig. 1-4a: Detail of upper section - "Line 1" and "Line 2"

Fig. 1-4b: Detail of lower section - "Line 2", "Line 3" and "Common"

end as of 10/18/2002 S.E.T.
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

Member Spotlight
Member Since: 12/24/00
Posts: 4259
New in the Gallery:
SE cable question

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Who's Online
2 registered (gfretwell, sparkyinak), 53 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
SE cable question
Top Posters (30 Days)
Admin 49
HotLine1 43
gfretwell 18
Ruben Rocha 12
Trumpy 9
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals