Question about Generac Guardian 100 Amp Transfer Switch NEMA 3R

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Have a 100 amp integrated 12 circuit load center. The top coil burnt bad. The main power is three phase four wire in the distribution panel but we only supplied emergency power to lighting circuits and electric range which are 120 volts and 240volts. Is it possible to get a feedback throught the third phase althoug it was not used in the transfer switch/load center, if power was only lost on on or two phases.

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Yes, if ANY load circuits on the third phase was ALSO connected to the transfer panel circuits, a sneak path would allow the third phase from the power company to backfeed this [panel causing damage.

Posted on Sep 26, 2009

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Need information on circuit breaker BR2100 60amp


Hi - I'm an electrician and can help you with your question.

A BR2100 circuit breaker is a 2 Pole 100 Amp (for the part number "BR2100", the "2" indicates the number of poles and the "100" indicates the amperage) circuit breaker. It can be installed in a single phase or three phase 120/240 VAC system panel that specifically lists the BR series breakers as acceptable for use.

A BR260 A BR2100 circuit breaker is a 2 Pole 60 Amp (the part number BR260, the "2" indicates the number of poles and the "60" indicates the amperage) circuit breaker. It can be installed in a single phase or three phase 120/240 VAC system panel that specifically lists the BR series breakers as acceptable for use.

It is not possible to have a BR2100 rated for 60 amps, 1 or 3 poles, or a BR260 rated for 100 amps, 1 or 3 poles.

It is not permissible to install any circuit breaker brand or type in any panel that does not specifically include it on a list of acceptable circuit breakers.

Circuit breakers are designed to carry 80% of the amperage rating.
To determine the load a circuit breaker can carry, multiply the circuit breaker amp rating by 80%.
This means that if you need to supply more than 80 amps, you cannot use a 100 amp circuit breaker. A higher rating is required. A BR2110 would be acceptable for loads greater than 80 amps, but less than 88 amps because the formula above says: 110 amp x 80% = 88 amps.

To determine the breaker size, determine the load (by measuring with a meter or obtaining amp rating of the load from the data plate) and multiply it by 125%. Using the same numbers in the example above; assume an 88 amp load. 88 amps x 125% = 110 amp circuit breaker. The 60 amp breaker is acceptable for up to 48 amps because 60amps x 80% = 48 amps. A 48 amp load needs a 60 amp breaker because 48 amps x 125% = 60 amps.

I hope this helps and good luck!

Jan 15, 2013 | Eaton Corporation BR2100 Circuit Breaker

1 Answer

Have fed pacific 100 amp main [rh13100 na ni ] that gets hot when ac,washer&dryer are all on,just started to trip main ?


Rich, This may sound obvious, but either the main breaker is acting normally because the load is near 100 amps, or it's defective. If it seems that the loading conditions have not changed from prior years, then you have probably been close to the 100 amp level before and a small amount of corrosion has occurred over time (accelerated by the heavy loading). The cleanliness and tightness of connections is critical to carrying loads at rated capacity. If you are close to the rated load, then replacing the main will buy you some time (but probably not as much as the original because the bus bar connection to the main is probably slightly corroded too) but it won't solve the problem - you will need to upgrade to a higher amp service. On the other hand, if you can calculate or measure the total load and you aren't near 100 Amps, then you just need to replace the main. One other thought. If you have a significant part of the load that is not 220V, then it you might have a higher load on one phase than the other, and could possibly be remedied by switching phases on some of the branch circuits. You only have to exceed 50 amps on one phase to trip a 100 amp main. Good luck, Al K

Apr 12, 2011 | Your One Source 100 Amp Main Breaker

1 Answer

A 60 Amp breaker (three phase) powers an 125 amp main lug 3 phase panel is that k or do i need a bigger braker. the wires are #8 THHN.


The breaker that feeds the panel and the wire are what determines the rating. The panel has to be at least as high as the breaker. It can be more, and no problem.The problem I see is that the wiring is undersized for the 60 amp breaker. You should have #6 wires or change the breaker to a 50 amp. If that is not enough for your load, you must change the wiring. It also depends on the type of wire. THHN will have the largest amperage, but if it is TW, it will be lower. Rule of thumb would be #10-30 amp, #8-40-50 amp, #6-50-60 amp, #4-70-90 amp and #2-95-135 amp. There are other factors, such as derating etc. but if you wanted to increase to 100 amp, I would run #2 thhn. Hope this helps.

Mar 05, 2011 | Siemens Murray 125 Amp Circuit Breaker...

1 Answer

How can i get single phase power from my 3 phase generator


I have not wire this myself
Wiki says under heading of single-phase:
http://en.wikipedia.org/wiki/Three-phase_electric_power
Single-phase loads may be connected to a three-phase system in two ways. A load may be connected across two of the three phase conductors or a load can be connected from a live phase conductor to the system neutral. Single-phase loads should be distributed evenly between the phases of the three-phase system for efficient use of the supply transformer and supply conductors. Where the line-to-neutral voltage is a standard utilization voltage (for example in a 230 V/400 V system), individual single-phase utility customers or loads may each be connected to a different phase of the supply. Where the line-to-neutral voltage is not a common utilization voltage, for example in a 347/600 V system, single-phase loads must be supplied by individual step-down transformers.

So it sounds like you take 2 legs of the 3-phase.
or
Take one leg of the 3-phase and connect to neutral ... neutral could be a ground rod.

I would put a meter on that circuit before hooking up my power saw.

Nov 17, 2010 | Electrical Supplies

1 Answer

Can tree limbs touching/rubbing against the wires coming from the utility pole cause the 100 Amp Main circuit breaker to trip????


yes,if it has worn the insulation through on one or more of the hot phase conductors to the neutral phase wire,but also check the neutral busbar in the breaker panel for a high resistance connection as this will also trip the main breaker

Jun 06, 2010 | Gb Electrical 100 Amp GE Load Center

2 Answers

I have a generator with a GE 3pole 100 amp main breaker its # 1-2-3 from left to right i'm using a 10ft piece 223 alum wire to hook it to the breaker panel my problem is the panel is a 100 amp square D...


the 1 and 3 poles, the 2nd is used for more a 3phase system, hooking up say 1 and 2 wont give you 120v. test with a volt meter to confirm but if your looking for 240 you need to use 1 and 3

Nov 06, 2009 | Electrical Supplies

1 Answer

AC Breaker trips and AC Fan turns slow.


Sounds like you have a bad capacitor for your squirrel cage fan , now as for the a/c unit sounds like you have a direct short in compressor to ground or leg to leg , check all wiring to make sure that it is not grounding out or melted together.

Jul 23, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

I need a fuse box diagram for a 1992 Ford Ranger. Any idea where I could find one?


owner manual.

here's the big ones for 1994 ranger. all i have
Section 18-01: Wiring and Circuit Protection 1994 All Ranger, Explorer and Aerostar Vehicles Workshop Manual
SPECIFICATIONS Specifications

High Current Fuses And Circuit Breaker — Ranger 2.3L, 3.0L And 4.0L
Circuit Size Location Electric Fuel Pump 20 Amp Fuse Power Distribution Box Headlamp Switch Feed 40 Amp High
Current Fuse Power Distribution Box #36 Circuit Alternator Output #2 15 Amp Fuse Power Distribution Box Fuse Panel 60 Amp High
Current Fuse Power Distribution Box Power Locks 20 Amp High
Current Fuse Power Distribution Box #38 Circuit Alternator Output #1 12 Ga Fusible
Link Integral with 14305 W/A Powertrain Control Module and Power Relay 30 Amp High
Current Fuse Power Distribution Box 4x4 Electric Shift 20 Amp High
Current Fuse Power Distribution Box Ignition Switch Feed 60 Amp High
Current Fuse Power Distribution Box High Beams and High Beam Indicator 22 Amp C.B. Integral with Headlamp Switch Front Wiper and Washer 6 Amp C.B. In Fuse Panel Power Windows 30 Amp C.B. In Fuse Panel Cigarette Lighter, Flash to Pass and Power Lumbar 20 Amp C.B. In Fuse Panel


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May 13, 2009 | 1992 Ford Ranger

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