Battery Size (Standby time in Amp Hours) = 1.25 x [(0.5 x 0.33) + (24 x (0.20 + 0.06))] If you can't find the appropriate documentation (or have doubts with respect to the condition of the generator, its maintenance or testing), you MUST ensure that the back-up batteries can meet the demand instead. The transmitter-receiver is preset to indicate a fire or fault when the beam's strength is below a certain value. User Manual This includes smoke detectors, pull stations, and horns and strobes. For some alarms, this may be as simple pressing and holding a button on the hood of the device. NFPA 654 Less than 3A quiescent current with detector fitted. March 2021 We have put packaged our most popular Conventional, 2 Wire & Addressable Fire Alarm System which can be found in our Fire Alarm Systems section. March 2019 Minerva 8/16/80 Range; Ireland it can be difficult to get certain brands and parts of fire alarm systems. All fire alarm systems must be fitted with a standby supply and this is achieved by using Sealed Lead Acid (SLA) batteries. November 2021 Fire Alarm Battery Calculator A quiescent test circuit for interfacing a high precision integrated circuit tester to a device under test (DUT). ). February 2019 UFC 4-021-01 Web14 Fire Safety Consultants, Inc. 27 Fire Alarm System - Testing 14.4 Testing 14.4.1.2 Reacceptance Testing Changes to site-specific software require: 100% test of all functions known to be affected by the change Additionally, 10% of initiating devices that are not I would then refer to UL864 for the minimum operating ability of receiving 20.4VDC input on the batteries to pass UL as a minimum and may allow a particular manufacturer to show operation at a lower point (but this is very difficult to accept due to battery "knee"). #3 - I only have to document the test of the common control (base panel) power supply and battery. This current flow is desirable, as it keeps an IC active to enable a quick restart to an operational mode. ASTM E1354 September 2018 NICET The ammeter should now display the systems supervisory current (a positive number). This is an Edwards QS (QuickStart) panel located in a small strip mall in Chilliwack. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Clear History | . DO NOT RELY on the Verification documentation or the bill of material which may be appended to it. 1.4 Fire alarm SIMULATE an alarm condition and confirm that all required common or Place RED lead into A (Amps) position on test meter as shown in fig.9. 2. If the sound is weak, you need to replace the batteries. IALM = Total Alarm Current in amps for all alarm devices connected to the alarm circuits Most of the modern batteries you will encounter are the 12VDC 7 ah batteries. Test 6 Battery current supplied to system normal 1. The quiescent current at the battery terminal for a W220, after the car has been locked for at least 20 minutes and the car has gone to sleep, should be no more than 0.050A or 50mA. This in itself is a non-compliance to BS5839. You push the button to sound the alarm. Disconnect a lead from the battery and connect the ammeter in series between the battery and the panel. 0000001029 00000 n October 2020 Some may also refer to this as a fire alarm control panel or fire alarm panel. NFPA 16 Generally, the value of the current depends on the overall system configuration, the ICs internal design, and the external components around the IC. IQP = Quiescent current in amps of control panel in fault condition [because of mains failure] UFC 3-600-01 PE Prep Series The 26 AH batteries were replaced last year. fire alarm September 2019 May 2019 To test the redundant communication for metallic conductors, individually initiate an open and ground fault on each individual conductor and a short between the conductors. In liew of the above battery tests, replace the battery with a new set having a current date code, amp-hour capacity and of a type as recommended by the manufacturer of the fire alarm system. You would connect it to a ammeter just the same. Connect and share knowledge within a single location that is structured and easy to search. Fire Dynamics Poll 3. For very low quiescent currents, you may need a more precise or quality meter. Calculation Crunching: Fire alarm math you should know June 2018 September 2017 At this point, the integrated circuit tester, sends an active select signal to the quiescent test circuit instantaneously which . Reconsider LM317L. August 2017 0000001433 00000 n WebQuiescent Current: <5mA (no LEDs illuminated) Alarm Current: <9mA: Alignment Current: <18mA: Power up Time: 20 seconds (approx.) Want to improve this question? Set your multi-meter for DC AMPS and ensure the leads are connected properly. 24VDC nameplate requires a minimum 20.4VDC for secondary power in the battery. You will observe that this reading will drop gradually as the system stabilizes and should return to the nominal reading you first observed. WebDuring a fire condition the display of events of a lower priority is suppressed. ASME A17.1 Power Dissipation Process, Formula, Applications, Best Portable Welder TIG, MIG, and Stick, Line vs Load Practical Implications, How to Differentiate, GFCI. July 2018 Is this plug ok to install an AC condensor? WebSuitable for esserbus and powered loop connection, with soft address coding, alarm latch and alarm indicator. For example, when a computer is put on sleep mode, most subsystems are shutdown. In addition, there is a need to always have a 1 M load on the DUT. ZETA MKII-HR INSTALLATION MANUAL Photoluminescent Extinguishing System Signs, CO Monitoring & Ventilation Control System, Automatic External Defibrillators (AED) Cabinets. This is normal. This fire alarm battery size calculator is meant to help your process; nothing more. Cloudflare Ray ID: 7c09b7d25974367e Company Registration 7499137. January 2022 Testing was pretty easy here. If you install batteries larger than the manufactueres recommendations then you will not acheive the battery recharge time. Battery Size (Standby time in Amp Hours) = 1.25 x 6.405 Your IP: NFPA 2001 The battery would be the same, but you had to measure the 85% at the boost converter output, not the battery. June 2017 October 2017 Some devices or circuits have IQs in the micro and nano amp ranges, which a cheaper meter would not be good enough to register properly. 0000002795 00000 n a. band pass filter b. blocking diode c. end-of-line capacitor d. end-of-line resistor Blocking Diode All devices on signaling line circuits have unique addresses. ICC-500 How can I set the quiescent current for a grounded-emitter amplifier? Fire alarm systems, including those incorporating a voice communication system, shall be provided with an emergency power supply conforming to Sentences (2), (3), and (4). October 2019 Roo - Can you be more specific about the problem? Web1. Hence, it offers faster testing and very accurate control of the DUT output voltage. It should read higher than the nominal charging voltage you recorded earlier. How to measure quiescent current fire alarm Many people think that a three-alarm fire is one to which three different fire stations respond, but this is not quite accurate. Fire Detection And Alarm Systems especially in the current climate can be challenging when it comes to stock. Pass/Fail Criteria for Fire Alarm Battery Test. 4 0 obj In this article, you will learn the meaning of quiescent current, how to calculate it, its formula, and the difference between quiescent current vs other types of currents. How to Test Your Smoke Detectors | Allstate Test batteries in central station facilities with tests that are dependent on battery material. WebWhile conducting an acceptance test for a fire alarm system, it is discovered that the cable used in PLFA with a voltage reading on the jacket of 300 Volts. WdiD_)tp]f i]&t&|&$4b 2Y9" Nothing changes. October 2016 Let's review the relevant sections of CAN/ULC-S536-13 as they apply to battery and power supply testing. DISPELLING THE MYTHS (AND SOME SUGGESTIONS): As you can see, the standby requirements (and associated testing criteria) for a fire alarm system are fairly stringent and should leave you with no doubt as to what you should be looking for. June 2021 NFPA 855 NFPA 13R INDUCED AC TEST: AC voltage between DC+ and earth. In other words, it is the current that a circuit draws when it is on standby or hibernation. Should be within 1 volt of the. %PDF-1.5 I have 52 local buildings and another 52 elsewhere in the US. Step-by-Step Guide to Performing a Quiescent Current Test on a WebNotification appliances commonly use a (n) ? I got a $20 battery tester on Amazon. Connect test leads to COM and V position as shown in fig.4. A system comprises of a 1 loop Premier Quatro panel, with 80 Fyreye Extra Addressable Optical Smoke Detectors, 15 Zeta Addressable Manual Call Points, 20 Zeta Addressable Securetone 2 Sounders and the required standby is 24 hours. Where is the battery connected? Fire alarm batteries should fully recharge within 24. rate of rise alarm is pre-configured in the detector. December 2020 . 2. Because it's based on the National Building Code I'm pretty sure the wording and references are good for other provinces. Notification appliances are controlled by the fire alarm control unit (FACU) using a notification appliance circuit (NAC). Moreover, quiescent current refers to only the part of the supply current the IC draws when the device is in a no-load, non-switching, but active mode. This makes having access to the installation manuals for the system you're testing absolutely essential. The action you just performed triggered the security solution. Conventional detectors can be connected to input of the MCP. You must approach EVERY inspection like a sceptic. Also, check the light on each alarm. October 2022 The global fire safet CALL NOW 805-665-3311 2090 E. Main St, Ventura, CA 93001 dap patching plaster vs joint compoundRetail HoursMON-THU 4pm to 8:30pm, SAT: 9am to 12:30pm Standard. The fire alarm control unit serves as the brain of the fire alarm system by monitoring all the inputs and controlling all the outputs. connected to the battery. November 2018 The manufacturer stipulates the type of battery and may even set limits on the size of battery a particular power supply can handle (they also provide the means to calculate the standby requirements of the system). UFC 3 600 01 IQL = 80 x 0.00044 + 15 x 0.001 + 20 x 0.0005 = 0.0602A, IALM = IALM-SND + IAP + IQL = 0.08 + 0.19 + 0.0602 = 0.3302, Battery Size (Standby time in Amp Hours) = 1.25 x [(TALM x IALM) + (TSBY x (IQP + IQL))] This is a common occurrence in large networked systems because it makes testing and set-up "easy". The batteries in the cabinet are date coded for 2009 (which means they were probably replaced during the last inspection in December). There are three main methods of doing so: self-test, two-amp loop, and three-amp loop. Intruder Alarms. Meter Testing Handout Test 1 Detector loop NFPA 495 Quiescent current vs GND pin current for Linear Regulator IC power dissipation, What does quiescent power mean and how I can find how much current the chip consume, How to control/remove "quiescent current" of UniversalOpamp2. You can estimate without measuring the alarm current by filling in the maximum total alarm current of 400 mA. Reference: Star Diagnosis System (SDS), Xentry, Workshop Information System (WIS). Weekly Exams, May 2023 0000001050 00000 n NFPA 72 NFPA 25 Quarterly Fire Alarm Testing Requirements. Battery & Power Supply Testing! I just ordered 40 of them. What is the symbol (which looks similar to an equals sign) called? NFPA 701 NFPA 291 Generally, does not pose a risk to users or other devices. If your meter is equipped with a MAX/MIN setting, engage it and wait for the display to stabilize at the highest current reading. ', referring to the nuclear power plant in Ignalina, mean? IQL = Quiescent current in amps of all loop devices, for instance an Ionisation Detector = 0.00005 Amp (50 A) , Optical Detector = 0.0001 Amp (100 A). March 2023 If however the building is not continuously manned, then the standby time may need to be 72hrs. The detector often gives false alarms. May 2022 True Which circuit class is considered as fail-safe? Gent S4-720 Heat Detector <> This is a Simplex 4000 networked system located in a twin high-rise complex equipped with an emergency generator. Leakage current is regarded as an energy loss because it performs no useful work. <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 3 0 obj NFPA 75 FM Global The BiWire Flexi fire alarm system is certified to EN54 part 2 and part 4 and is designed to meet the recommendations in BS5839. NFPA 72, National Fire Alarm and Signaling Code is referenced by the Life Safety Code. Connect test leads to COM and V position as shown in fig.14. (Full alarm current from panel) = 0.3 Amps First multiply I1 (0.05 Amps) by T1 (324 Hours) = 1.2Ah (Amp hours) Then add on I2 (0.3Amps) = 1.5Ah Then multiply the whole by the aging factor (1.25) How to test your smoke detectors and fire alarms. Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Parts and Links:CR105 - https://www.autozone.com/batteries-starting-and-charging/ballast-resistor/duralast-ballast-resistor/113886_0_0?\u0026searchText=cr105Multimeter - http://a.co/iubpgi9 Aligator Clips - http://a.co/0GxbPKK Electrical Tape - http://a.co/3jqOsSIWEBSITE: https://www.thefirepanel.com/FORUMS: https://forums.thefirepanel.com/INSTAGRAM: https://www.instagram.com/TheFirePanel/FACEBOOK: https://www.facebook.com/TheFirePanelLLC/TIKTOK: https://www.tiktok.com/@TheFirePanelLegal Disclaimer: This video may contain bright, rapid flashing strobe lights. You are correct, most of the time. Quiescent current is the amount of current a circuit, that is doing nothing, takes. Mini Split Window Air Conditioner, Add 1.5mA for LED on The TrueSTART II (System Technical Analysis and Readiness Testing) Contact the ARC (Alarm Receiving Centre) and confirm they have received the fire signal and take the system off 'test'. IFC 1 h for a building classified as a Group B major occupancy that is not within the scope of Subsection 3.2.6. h for a building constructed in accordance with Article 3.2.2.50, or 3.2.2.58., 5 min for a building not required to be equipped with an annunciator, and, The emergency power supply required by Sentence (1) shall be designed so that, in the event of a failure of the normal power source, there is an immediate automatic transfer to emergency power with no loss of information.. How to Calculate Fire Alarm Standby Battery Size The fire alarm testing will test to ensure all components are in working order. 14 Gilsea Park, Mona Close, WebStation a family member at the furthest point away from the alarm in your home. 1 0 obj Guide to Fire Alarm Basics Pass/Fail Criteria for Fire Alarm Battery Test? What were all about!We are not affiliated with ASTTBC, CFAA, CANASA, NFPA, NAFED, or NICET (although we encourage you to explore and objectively evaluate the benefits associated with supporting their individual efforts). What "benchmarks" means in "what are benchmarks for?". IMC Web1.25 x ( ( Quiescent Current x Standby Time ) + ( Derating Factor x Alarm Current x Alarm Time ) ) Click here for more information on how this data was calculated. Smoke Management How to Calculate Fire Alarm Standby Battery Size In accordance with BS 5839, all category L & M fire alarm systems must be fitted with a standby . Club Pilates Instructor Salary, For example, is your problem about, How do you measure quiescent current? July 2022 Optical smoke beam detector However, the quiescent and the shutdown current of a device are different. ISO Simplex has/had a system that used a boost converter to change the 24VDC to 29VDC because their devices had a higher voltage requirement. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Special Hazard Systems Frequent kitchen smoke has caused it to activate often, which may wear it out faster. Water Based Fire Suppression A refers to battery type which means it's either a sealed lead acid (SLA), wet lead, ni-cad, or some other type as recommended by manufacturer. Browse our online shop or contact us for a quote today. Quick and simple installation. Supply current refers to the total current a circuit draws from a power supply, irrespective of the loading condition. (Refer to Appendix F3, Battery Capacity Meter Test); or. September 2020 Rate-of-rise heat detector Fire Alarm How to test fire alarms | Fire Protection Association First, the level of voltage in the system affects them both as their current values increase with input voltage. WebFirst check the battery voltage. 4L@ NBC (Full alarm current from panel) = 0.3 Amps First multiply I1 (0.05 Amps) by T1 (324 Hours) = 1.2Ah (Amp hours) Then add on I2 (0.3Amps) = 1.5Ah Then multiply the whole by the aging factor (1.25) How to test your smoke detectors and fire alarms. Therefore, part of the overall input current. Measure with charge leads. Turn off the circuit disconnect means to the fire alarm system. stream What does 'They're at four. BATTERY CHARGING VOLTAGE TEST: DC voltage at battery terminals. Set range to highest DC Amps range . You measure it like you would active current use. how to measure quiescent current fire alarmare there really purple owls. The name of this method stems from its use of the device under test (DUT) to perform the test. trailer << /Size 59 /Info 46 0 R /Root 48 0 R /Prev 377478 /ID[<21ca6466a386e20ec065b77175ee7ad1><21ca6466a386e20ec065b77175ee7ad1>] >> startxref 0 %%EOF 48 0 obj << /Type /Catalog /Pages 45 0 R /Outlines 16 0 R /PageMode /UseThumbs /PageLayout /SinglePage /OpenAction 49 0 R >> endobj 49 0 obj << /S /GoTo /D [ 50 0 R /Fit ] >> endobj 57 0 obj << /S 88 /T 128 /O 176 /Filter /FlateDecode /Length 58 0 R >> stream cVZ ` 2 Set your Fill in the system alarm current in the Multiply the alarm current by two (if the Code requirement is for two hours of alarm time). If the battery is in a notification appliance extender, always replace with matching or higher Amp hours, as those have battery calcs that correspond to the circuit. Consulting - Specifying Engineer December 2022 Swansea, SA6 8RJ. These types of regulators deliver output voltage that is close in value to the input voltage, thereby improving power efficiency. Let's review the British Columbia Building Code Division B Part 3. August 2020 NFPA 110 November 2016 Nothing changes. This is my detailed guide and instructions on how to carry out a fire alarm weekly test in the UK. Important: Zero the current clamp beforehand. Moreover, any devices seen in this video were utilized in a private environment from a private collection. VAT Registration Number 106 0586 39. Quiescent Current vs Shutdown Current for Load Switch #4 - I don't ever have to perform adjustments to the systems battery charger. endobj \=+VzI&~zhpY~0021D H eBH)f WebSpecified W220 Quiescent Current Draw/Load. How do you measure quiescent current? [closed] If the circuit is not properly grounded, it can flow to the device chassis and pose a risk to operators. MR601TEx INTRINSICALLY SAFE ENHANCED OPTICAL Design Documents PANEL AUXILIARY DC VOLTAGE TEST:DC voltage supply to detectors. the AC power source. The quiescent test circuit is capable of supplying a high powered (V1) voltage supply to a DUT while the DUT's desired dynamics internal state is reached. Check the power by pressing the test button. 9/14/2020 4 Comments NFPA 72 requires a battery test be run including removal of the main power supply, waiting the full-length standby time, then activating User Actions Carry out the required fire drill. November 2017 A quiescent test circuit for interfacing a high precision integrated circuit tester to a device under test (DUT). It's normally NOT ALLOWED. Calculations for this must not only include the minimum fuel level, but also an appropriate trouble indication at the fire alarm panel should the level fall below the required run time. 4hW7|C)"B|-!5e`i Yr _#QJL^6T7{3b]/(=kCOm)2dy'sTbHEj`(z{#tQcfpOiHekm]+I!{;'xKbhh0:=. I would not recommend using the clamp-on style meter for this. Clamp the RED (positive) lead to the RED (postive) terminal that the jumper you removed in step 1 was connected to. They should be dated when installing with a Sharpie. (LM4250). 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI, Measuring quiescent current of a voltage regulator, Why change the quiescent current in an op-amp? W Concept Nylon Crossbody Bag, A117.1 May 2018 This can be critical to help make sure the alarm can be heard everywhere in your home. The transmitter-receiver is preset to indicate a fire or fault when the beam's strength is below a certain value. To view these events refer to section 5.19. NFPA 497 Campervan Leveling Blocks, Smoke Detector Cross Listing Information: (And take your career to the next level! WebIn fire alarm state, the two LEDs shown in Fig-1 will light. So, when the regulator is not actively supplying a load, this current flows to the ground (GND) terminal. Updates how to test fire alarm quiescent current Because each manufacturer requires a slightly different voltage for the minimum battery voltage, you will have to contact technical support for the manufacturer of the panel you are working on to determine the exact minimum voltage for the batteries. NFPA 15 NFPA 770 Add the results of step 18 and step 19 together and multiply by the manufacturers recommended de-rating factor (this is commonly 1.2). August 2019 NFPA 72 does not specify these numbers as different manufacturers have different nameplate voltages for the circuits and minimum voltages for the devices. hb```f``2l cB'f C(-zNz'No'r7sgUeV[XnLN[ONXqo8_1& July 2016 WebAn alarm is actuated at carbon monoxide (CO) concentration levels that are life-threatening for humans. Other September 2022 September 2021 Describe: Model: CS01W color: White Material: ABS Power: 2 1.5V AA batteries (not included) Sensor: infrared photoelectric sensor APP name: Tuya / Smart Life Quiescent current: < 10 uA Alarm current: < 30 mA Audible alarm: >85 DB/3m Working temperature: 0-40 Relative humidity: 10%- 95% Product size: 12x12x2.8cm Net weight: 120 grams Detected gases: carbon monoxide and smoke Connection . Subscribe and learn something new each day: Get 100 Days of Free Sample Questions right to you! hTmO0+xaIZ M&0@PS__vMQjNl~lDw(b(CzrP94T ).3T!0jQ)g,3\K9Q`K_W~\jiRb{#4c]^K,]X/KgqGpG,6xiixnxUwK&q (For instance, a Battery connected device). >Cs;rmkD?5"gN$Nw~84oGJ'`Cm(!_R5`ilrx,R Knowing the quiescent current value helps an electrical designer compare the low-power performance of different integrated circuits (IC). Thus, quiescent current is a subset of the supply current. Battery Size (Standby time in Amp Hours) = 1.25 x [(0.5 x 0.33) + (24 x 0.26)] I was told that this was the size of the batteries originally supplied with the system (that Edwards had engineered the system this way). Add the results of step 18 and step 19 together and multiply by the manufacturer's recommended de-rating factor (this is commonly "1.2"). how to test fire alarm quiescent current As a result, the quiescent current is a major consideration in the design of such circuits. This is the. Click to reveal Fill in the system alarm current in the Current per Device column on the Current Draw worksheet. Record the alarm current reading on your test report. This particularly holds true for products that are often on standby. 0000000781 00000 n BS5839 Part 1 BS5839 Part 6 Grade A. Quiescent Current (Amps) Alarm Current (Amps) Derating Factor. You measure it like you would active current use. This tool will return a wrong calculation for any other voltage range. November 2022 Human Behavior According to the NEC, the cable shall have a voltage readings if not less than _____volts? Flammable & Combustible LIquids signal., This could include configuring the alarm signalling equipment to test mode and confirm normal operation at completion . MAPNET II or IDNet auto select 2. The COMMON FIRE and zone LEDs go steady. ASCE 7 November 2019 The ADJ pin current is only typically 0.2 uA, 5 uA max for loads under 100 mA. April 2020 Quiescent Current Burglar Alarm Photoelectric Fire Detector for Sale, Find Details about Smoke Alarm, Mini Smoke Alarm from Quiescent Current Burglar Alarm Photoelectric Fire Detector for Sale - Ningbo Kingdun Electronic Industry Co., Ltd. Search. I think we can safely assume the batteries were replaced in 2007. Canadian of Polish descent travel to Poland with Canadian passport. compact, small, red, with isolator and glass pane Membership in the Fire Technicians Network is entirely voluntary. January 2020 Fire Alarm Ch. 2 Flashcards | Quizlet The panels have the following optional features as standard: FIRE ALARM DEVICES: (EN54 part 2 clause 7.8) TEST CONDITION: (EN54 part 2 clause 10) Control of fire alarm routing equipment (EN54 part 2 clause . The alarm emits short beeps regularly without anyone touching it. 82.165.198.169 Re: Low quiescent alternative to LM317. TSBY = 24 Hr WebQuiescent Current Formula. NFPA 30B 2. In other words, it is the current that a circuit draws when it is on standby or hibernation. MES Taking Down Carefully Aluminium Point Wiring (Light, Fan, Socket, Bell Or Power), Complete With Fitting Such As Switches Ceiling Roses, Lamp Holders, Sockets, Regulators, Call Bell Light Fitting With Pvc Conduit Surface /Concealed Or Wooden Pattens Including Sunken Cast Iron /Pressed Steel Terminal Boxes Etc And Making Good The Disturbed Surfaces Of Walls, Roof, Floors Etc To Match With . Find Chefs Looking For Work, Also, both current values increase with increasing ambient temperature. Reply #15 on: March 09, 2016, 03:44:46 pm . 339 0 obj <>/Filter/FlateDecode/ID[<33F7CA53AD80A393605B995B8DB1B426><7F90AA0AD6717D46AAE8D20713DD69DA>]/Index[329 23]/Info 328 0 R/Length 66/Prev 1045514/Root 330 0 R/Size 352/Type/XRef/W[1 2 1]>>stream CALCULATING BATTERY STANDBY REQUIREMENTS: In most instances, the manufacturer provides a form for you to utilize in calculating the size of the battery required. Operating Range: 5 to 50 metres The meter will indicate the alarm current, which will be in the range of 120-400 mA. This means you must test EVERY battery and power supply associated with it. LED off. AC noise should not exceed 1.2volts max. If your system has more than one set of batteries, they MUST be tested and the INDIVIDUAL results recorded in the inspection report!

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