Unable to Recharge the prepaid meter

Solution: Connectivity Check: Confirm the meter is successfully communicating with the server. Serial Number Verification (SmartComm): Access the SmartComm Customer Master and ensure the serial number recorded matches the physical serial number of the connected meter. Duplicate Configuration Check: Verify that no two meters are incorrectly configured with the exact same serial number in the system.

Email Configuration SMTP Details Outlook

Solution: SMTP Host/Server Name: For Outlook.com: smtp-mail.outlook.com For Office 365/Microsoft 365: smtp.office365.com SMTP Port:587 (recommended) Encryption Method: STARTTLS Authentication: Your email account needs to be authenticated, so enable login or use the ""My outgoing server (SMTP) requires authentication"" option in your email client. Username: Your full Outlook email address (e.g., yourname@outlook.com or yourname@domain.com) Password: Blank

Email Configuration App Password creation for Gmail account

Reason - Gmail will work only with a secure encrypted app password Solution: Go to your Google Account settings. Navigate to the Security tab. If you don't have it enabled, turn on Two-Step Verification. Find and click on App passwords. Select an app name (like ""SMTP"" or ""Mail Client"") and click Generate. Copy the generated 16-character password and use it in your mail client's password field instead of your main Gmail password.

Email Configuration SMTP Details Gmail

Solution: Gmail SMTP Settings SMTP Server: smtp.gmail.com Port: 587: (requires STARTTLS/TLS) 465: (requires SSL) Authentication: Required Username: Your full Gmail address (e.g., user@gmail.com) Password: An App Password generated from your Google Account security settings Security/Connection: TLS or SSL, depending on the port chosen

Transfer existing sensor to a different gateway

Reason - Loss of old data stored under device id created Solution: To prevent data loss, edit the sensor and use the "Move to Gateway" option to transfer the sensor to a different gateway.

Asset list is not available in the filter

Reason - The asset is not assigned to the organization Solution: Check the asset selection settings in organization settings

Reason - Sensor/gateway limit exceeded Solution: Check license information for sensor/gateway limit

Cannot change the ip address of gateway

Reason - The ip address should is not available Solution: 1. if company network is being used check the accesibility to access 2. check if set ip is with in subnet range 3. Check if Primary and Secondary DNS is correct as per network settings 4. Set the Default Gateway IP to match the router's IP or the company network's default gateway IP.

3rd part meter not communication

Reason - 1. Memory map configuration wrong 2. (10 power -4 )Conversion factor is not available in third party memory map configuration 3. Data on modscan and software is matching but not matching with meter display readings Solution: 1. Verify data via Modscan, check wiring, confirm the meter parameter's datatype/function code in the memory map, and ensure the gateway supports that parameter datatype. 2. Can be added from conversion factor available in Master settings

Could not download certificate

Reason - All mandatory fields are not saved in organisation info settings Solution: All details should be given in mandatory field of organisation settings

Cable selection for capacitors

Updated: Sep 08, 2026 | 6 min read

Technical Articles

Published: Jul 14, 2026 by Abhinav L Purkar

Technical Articles

Click on any topic to jump to that section

Switchgear and cable selection for capacitor application is quite challenging. The reason is the capacitive networks are more prone to over-current, high peak inrush current and continuous flow of full load current. Usually the capacitors are designed to withstand and operate normally, even during the above said abnormalities, for a finite amount of time. Hence, the switchgear and cables in the capacitor network should be rated accordingly, so as to withstand & operate normally during these abnormalities.

The capacitors draw occurs because of the harmonics, capacitance tolerances, voltage variation and frequency variation. The permitted over-current is up to 146% of the rated current, which comprises the following:

Harmonics overload and over voltage - 30%
Capacitance tolerance - 10%
Frequency variation - 2%

Accordingly, the cables should also be derated, to continuously withstand permitted over-current. The derated cable will also help in withstanding the electrical and thermal stresses that occur during every switching cycle because of high inrush current.

Following is the recommended cable selection chart

Capacitor rating (kVAr)	IN at the rated voltage (in A)		Derated IN at the rated voltage (in A)		Minimum recommended copper cable size** (sq.mm)
Capacitor rating (kVAr)	440 V	415 V	440 V	415 V	Minimum recommended copper cable size** (sq.mm)
1	1.31	1.39	1.92	2.03	0.5
2	2.62	2.78	3.83	4.06	0.5
3	3.94	4.17	5.75	6.09	0.75
4	5.25	5.56	7.66	8.12	1.0
5	6.56	6.96	9.58	10.16	1.0
6	7.87	8.35	11.49	12.19	2.5
7.5	9.84	10.43	14.37	15.23	2.5
8.3	10.89	11.55	15.90	16.86	2.5
10	13.12	13.91	19.16	20.31	4.0
12.5	16.40	17.39	23.95	25.39	4.0
15	19.68	20.87	28.74	30.47	6.0
20	26.24	27.82	38.32	40.62	10.0
25	32.80	34.78	47.90	50.78	16.0*
30	39.37	41.74	57.47	60.94	25.0
50	65.61	69.56	95.79	101.56	35.0
75	98.41	104.34	143.69	152.34	70.0
100	131.22	139.12	191.58	203.12	95.0

Capacitor rating (kVAr)	IN at the rated voltage (in A)		Derated IN at the rated voltage (in A)		Minimum recommended copper cable size** (sq.mm)
Capacitor rating (kVAr)	440 V	415 V	440 V	415 V	Minimum recommended copper cable size** (sq.mm)
1	1.31	1.39	1.92	2.03	0.5
2	2.62	2.78	3.83	4.06	0.5
3	3.94	4.17	5.75	6.09	0.75
4	5.25	5.56	7.66	8.12	1.0
5	6.56	6.96	9.58	10.16	1.0
6	7.87	8.35	11.49	12.19	2.5
7.5	9.84	10.43	14.37	15.23	2.5
8.3	10.89	11.55	15.90	16.86	2.5
10	13.12	13.91	19.16	20.31	4.0
12.5	16.40	17.39	23.95	25.39	4.0
15	19.68	20.87	28.74	30.47	6.0
20	26.24	27.82	38.32	40.62	10.0
25	32.80	34.78	47.90	50.78	16.0*
30	39.37	41.74	57.47	60.94	25.0
50	65.61	69.56	95.79	101.56	35.0
75	98.41	104.34	143.69	152.34	70.0
100	131.22	139.12	191.58	203.12	95.0

** Cross section values mentioned above are guidelines that are valid for operation under normal conditions & at ambient temperature of 40° C.

* Use spreader while using 16 sq. mm cable

Busbar selection in APFC panels can be done with the standard calculations for short circuit withstand capability and temperature rise (current density). The only assumption is that the rated current should be considered as 146% the total capacitor rated current.

It is recommended to use capacitor duty contactors to reduce the magnitude of peak inrush current. This will reduce the thermal and electrical stress in the capacitors, cables and switchgear, which happens during each switching cycle. This also prevents the premature failure of capacitors and nuisance tripping of short circuit protection device. The above special selection for cables will also overcome the heating and losses that happens because of skin effect.

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About the Author

Abhinav L Purkar,

Manager Product Management & Marketing (PMM)

Abhinav Purkar is a Product Management, Marketing, and Application Engineering professional with over 10 years of experience in the Power Quality domain. He has extensive expertise in power quality analysis, harmonic mitigation, reactive power compensation, energy efficiency, and electrical system optimization, helping customers improve system reliability and operational performance. With proven experience in product lifecycle management, market development, portfolio growth, and go-to-market strategy, Abhinav has successfully driven initiatives that enhance customer value and strengthen market presence. His strong technical foundation, combined with strategic business acumen, enables him to bridge the gap between customer requirements and innovative product offerings.