> ## Documentation Index > Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt > Use this file to discover all available pages before exploring further. # Quiz — CT, Meter & Zero Export: 10 Questions with Answers > 10 multiple-choice questions on CT and zero export: placement, arrow direction, ratio settings, lead extension rules, and zero-export configuration. Ten questions from the [CT, Meter & Zero Export](/ct-meter/ct-basics) group. Work through all ten before scrolling to the key. Suggested pass mark: **8 / 10**. Each miss points to a source page — re-read it, not the whole group. ## Questions **1.** The universal CT placement rule on both Kent platforms is: clamp the CT around the: * A. Grid main live conductor only — arrow pointing toward the grid * B. Backup feed conductor — arrow pointing toward the loads * C. Live and neutral together — arrow in either direction * D. Earth conductor at the incomer *** **2.** If you install a CT with the arrow pointing toward the loads instead of toward the grid, the most likely symptom is: * A. The system shuts down immediately * B. Erratic power readings with sustained or fluctuating export even under stable load conditions * C. The battery stops charging * D. E100 appears on the Kent M1 *** **3.** Clamping the CT around both live and neutral conductors together results in: * A. Double the correct reading — a 2× calibration error * B. A reading of 0 W — the equal and opposite currents cancel * C. A negative power reading * D. An overcurrent fault on the inverter *** **4.** The CT ratio setting in the inverter must be taken from: * A. The platform's factory default — it is pre-configured for the shipped CT * B. The DISCOM's standard CT ratio table for the region * C. The nameplate of the specific CT shipped with the system — read it and set exactly that * D. The meter's LCD display *** **5.** On both Kent platforms, extending the CT signal lead with additional cable is: * A. Acceptable up to 10 m using shielded twisted-pair cable * B. Acceptable using any matching cable up to 5 m * C. Not permitted — if the lead does not reach, use the platform's meter scheme instead * D. Acceptable if the cable resistance is below 2 Ω *** **6.** On the Kent M1, when zero export is required, the Solar Sell setting must be: * A. ON, with Max Sell Power set to 0 W * B. OFF — and the zero-export witness test against the utility meter is mandatory before sign-off * C. Removed by deleting the CT entry * D. Set to the DISCOM's published limit automatically *** **7.** On the Kent G3 site with no feed-in permission, zero export is set by: * A. Setting Max Export Power to 0 in the grid settings * B. Setting Allow Export to maximum — the CT limits it physically * C. Leaving the export settings at factory default * D. Changing the grid code to a no-export variant *** **8.** What does a short spike of export during a large load switch-off tell you about the zero-export setup? * A. The CT direction is reversed * B. The export limit value needs halving * C. Spikes on load switching are physics — they are not evidence of a zero-export failure; sustained export is the failure mode to investigate * D. The meter RS485 address is wrong *** **9.** The Kent M1 E106 fault code relates to: * A. Battery undervoltage * B. CT abnormal — check CT installation, direction, and connection * C. Grid overvoltage * D. Fan failure *** **10.** Zero-export control via the CT and inverter cannot control: * A. The battery discharge rate * B. The PV output on the Kent M1 * C. Third-party grid-tied (GT) inverters on the same supply — they are invisible to the Kent system * D. The backup loads during an outage *** ## Answer key | Q | Answer | Why | | -- | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 1 | **A** | CT on the grid main live conductor, arrow toward the grid. This applies to both Kent M1 and G3. Installing on a sub-circuit or with the arrow reversed both produce incorrect control. | | 2 | **B** | A reversed CT causes erratic or persistently wrong power readings. The control loop chases the wrong signal, producing fluctuating display values and potential sustained export. | | 3 | **B** | Clamping around both L and N means equal and opposite currents cancel — the CT reads 0 W. The inverter sees no load and cannot control export. | | 4 | **C** | Always read the nameplate of the shipped CT and set that exact ratio. Never assume a default — the shipped CT ratio is confirmed on the nameplate only. | | 5 | **C** | CT signal lead extensions are not permitted on either platform. If the lead cannot reach the grid connection point, use the platform's smart meter scheme instead. | | 6 | **B** | On the Kent M1, Solar Sell OFF is the zero-export setting. The witness test against the utility meter is mandatory before the job is signed off. | | 7 | **A** | On the Kent G3, set Max Export Power to 0 in the grid settings. This is the correct zero-export configuration for a no-feed-in site. | | 8 | **C** | Brief spikes on large load transitions are a physics effect — the inverter cannot respond in zero time. Sustained export is the indicator of a real zero-export failure. | | 9 | **B** | E106 on the Kent M1 is a CT abnormal fault. Check the CT installation, direction, connection, and ratio setting. | | 10 | **C** | The Kent zero-export control loop only controls the Kent inverter's own output. Third-party GT inverters on the same supply are invisible and will export independently. | ## Related pages * [CT Basics](/ct-meter/ct-basics) * [Direction & Location](/ct-meter/direction-and-location) * [Zero Export — the Concept](/ct-meter/zero-export-concept) * [Wrong-CT Symptoms](/ct-meter/wrong-ct-symptoms) * [Energy-Flow Test](/ct-meter/energy-flow-test)