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

Detailed Selection guide for lightning circuit

Updated: Sep 02, 2026 | 6 min read

Technical Articles

Published: Jul 14, 2026 by Sandeep Pawar

Technical Articles

Click on any topic to jump to that section

Today, street lighting commonly uses high intensity discharge lamps. The lamps generally used for street lighting and outdoor lighting are given below.

Metal Halide lamps
Sodium vapour lamps

Out of these, high pressure sodium vapour lamps are the most ubiquitous for street lighting because they are the most efficient light source. HPSV lamps are preferred because even though it has low colour rendering, it is not a major requirement in street lighting applications. The comparison is shown in the annex.

Brief Description of HPSV lamp

Operation:

These lamps use an alloy of sodium and mercury (called sodium amalgam) in a discharge through xenon gas at high pressure inside the arc tube.
There is an ignitor built into the ballast which sends a pulse of high voltage energy (3000V to 4500V) through the arc tube. This pulse starts an arc through the xenon gas.
This ignitor operates within a second or two after switch on, and through the ballast induces aseries of very high voltage pulses to ignite the lamp. Once the lamp has started, the internal ignitor stops operating.
Xenon gas is ionized and this facilitates striking of arc when voltage is applied across electrodes. The heat generated by the arc then vaporizes the mercury and sodium. The mercury vapor raises the gas pressure and the sodium vapour produces light when the pressure within the arc tube is sufficient.

Current profile

Inrush current during switch ON due to charging of circuit capacitors: With the capacitor introduced in the supply circuit for power factor compensation, it draws a charging current during switching ON. The value of inrush current during switch ON of lamps is generally between 20-601n for a period less than 5 ms.

Preheating current: Before ignition in order to ionize the gas between the electrodes, the discharge lamp draws more current from the supply. This current (also known as starting current) generally ranges from 1.1 to 1.6 times the nominal current In for a period of 2-10 min.

For Lighting Circuit Switching

According to IEC 60947-4-1: AC-5a, 5b Utilization category The operating conditions of lighting circuits have the following characteristics:

Continuous duty: the switching device can remain closed for several days or even months
A dispersion factor of 1: all luminaries in the same group are switched ON or OFF simultaneously
A relatively high temperature around the device due to the enclosure, the presence of fuses, or an unventilated control panel location

Contactor Selection

Based on:

A 220/240V single-phase circuit
An ambient temperature of 55CO, taking into account the operating conditions
An electrical life of more than 10 years

Considerations:

The total current
Transient phenomena which occur at switch-on
The starting current and their duration
The circulation of any harmonics which may be present

A) Selection chart for HPSV lamps 240V, 50 Hz with power factor compensation Utilization category AC-5a

HPSV Chart with Compensation

Lamp characteristics	Rating (W)		50	70	100	150	250	400	700	1000
Lamp characteristics	Total power (Including ballast power)		62.5	87.5	125	187.5	312.5	500	875	1250
Starting (preheating) current (A)			0.40	0.55	0.79	1.19	1.98	3.17	5.55	7.93
Running current (A)			0.28	0.40	0.57	0.85	1.42	2.26	3.96	5.66
Capacitance value required for compensation			6.8	10	15	22	33	68	100	150
Max no. of lamps per phase	MO 9 (qty)	9	32	23	16	11	6	4	2	2
	MO 12 (qty)	12	42	30	21	14	8	5	3	2
	MO 18 (qty)	18	63	45	32	21	13	8	5	3
	MO 25 (qty)	25	88	63	44	29	18	11	6	4
	MO 32 (qty)	32	113	81	56	38	23	14	8	6
	MO 40 (qty)	40	141	101	71	47	28	18	10	7
	MO 45 (qty)	45	159	113	79	53	32	20	11	8
	MO 50 (qty)	50	176	126	88	59	35	22	13	9
	MO 60 (qty)	60	212	151	106	71	42	26	15	11
	MO 70 (qty)	70	247	176	123	82	49	31	18	12
	MO 80 (qty)	80	282	202	141	94	56	35	20	14
	MO 95 (qty)	95	335	239	168	112	67	42	24	17
	MO 110 (qty)	110	388	277	194	129	78	48	28	19
	MO 140 (qty)	140	494	353	247	165	99	62	35	25
	MO 185 (qty)	185	652	466	326	217	130	82	47	33
	MO 225 (qty)	225	794	567	397	265	159	99	57	40
	MO 250 (qty)	250	882	630	441	294	176	110	63	44
	MO 300 (qty)	300	1058	756	529	353	212	132	76	53

Lamp characteristics	Rating (W)		50	70	100	150	250	400	700	1000
Lamp characteristics	Total power (Including ballast power)		62.5	87.5	125	187.5	312.5	500	875	1250
Starting (preheating) current (A)			0.40	0.55	0.79	1.19	1.98	3.17	5.55	7.93
Running current (A)			0.28	0.40	0.57	0.85	1.42	2.26	3.96	5.66
Capacitance value required for compensation			6.8	10	15	22	33	68	100	150
Max no. of lamps per phase	MO 9 (qty)	9	32	23	16	11	6	4	2	2
	MO 12 (qty)	12	42	30	21	14	8	5	3	2
	MO 18 (qty)	18	63	45	32	21	13	8	5	3
	MO 25 (qty)	25	88	63	44	29	18	11	6	4
	MO 32 (qty)	32	113	81	56	38	23	14	8	6
	MO 40 (qty)	40	141	101	71	47	28	18	10	7
	MO 45 (qty)	45	159	113	79	53	32	20	11	8
	MO 50 (qty)	50	176	126	88	59	35	22	13	9
	MO 60 (qty)	60	212	151	106	71	42	26	15	11
	MO 70 (qty)	70	247	176	123	82	49	31	18	12
	MO 80 (qty)	80	282	202	141	94	56	35	20	14
	MO 95 (qty)	95	335	239	168	112	67	42	24	17
	MO 110 (qty)	110	388	277	194	129	78	48	28	19
	MO 140 (qty)	140	494	353	247	165	99	62	35	25
	MO 185 (qty)	185	652	466	326	217	130	82	47	33
	MO 225 (qty)	225	794	567	397	265	159	99	57	40
	MO 250 (qty)	250	882	630	441	294	176	110	63	44
	MO 300 (qty)	300	1058	756	529	353	212	132	76	53

B) Selection chart for HPSV lamps 240V, 50 Hz with power factor compensation Utilization category AC-5a

HPSV Chart without Compensation

Lamp characteristics	Rating (W)		50	70	100	150	250	400	700	1000
Lamp characteristics	Total power (Including ballast power)		62.5	87.5	125	187.5	312.5	500	875	1250
Starting (Preheating) current (A)			0.91	1.28	1.82	2.73	4.56	7.29	12.76	18.23
Running current (A)		AC3	0.65	0.91	1.30	1.95	3.26	5.21	9.11	13.02
Max no. of lamps per phase	MO 9 (qty)	9	14	10	7	5	3	2	1	1
	MO 12 (qty)	12	18	13	9	6	3	2	1	1
	MO 18 (qty)	18	28	20	14	9	6	3	2	1
	MO 25 (qty)	25	38	27	19	13	8	5	3	2
	MO 32 (qty)	32	49	35	25	16	10	6	4	2
	MO 40 (qty)	40	61	44	31	20	12	8	4	3
	MO 45 (qty)	45	69	49	35	23	14	9	5	3
	MO 50 (qty)	50	77	55	38	26	15	10	5	4
	MO 60 (qty)	60	92	66	46	31	18	12	7	5
	MO 70 (qty)	70	107	77	54	36	21	13	8	5
	MO 80 (qty)	80	123	88	61	41	25	15	9	6
	MO 95 (qty)	95	146	104	73	49	29	18	10	7
	MO 110 (qty)	110	169	120	84	56	34	21	12	8
	MO 140 (qty)	140	215	153	107	72	43	27	15	11
	MO 185 (qty)	185	284	203	142	95	57	35	20	14
	MO 225 (qty)	225	345	246	173	115	69	43	25	17
	MO 250 (qty)	250	383	274	192	128	77	48	27	19
	MO 300 (qty)	300	460	329	230	153	92	58	33	23

Lamp characteristics	Rating (W)		50	70	100	150	250	400	700	1000
Lamp characteristics	Total power (Including ballast power)		62.5	87.5	125	187.5	312.5	500	875	1250
Starting (Preheating) current (A)			0.91	1.28	1.82	2.73	4.56	7.29	12.76	18.23
Running current (A)		AC3	0.65	0.91	1.30	1.95	3.26	5.21	9.11	13.02
Max no. of lamps per phase	MO 9 (qty)	9	14	10	7	5	3	2	1	1
	MO 12 (qty)	12	18	13	9	6	3	2	1	1
	MO 18 (qty)	18	28	20	14	9	6	3	2	1
	MO 25 (qty)	25	38	27	19	13	8	5	3	2
	MO 32 (qty)	32	49	35	25	16	10	6	4	2
	MO 40 (qty)	40	61	44	31	20	12	8	4	3
	MO 45 (qty)	45	69	49	35	23	14	9	5	3
	MO 50 (qty)	50	77	55	38	26	15	10	5	4
	MO 60 (qty)	60	92	66	46	31	18	12	7	5
	MO 70 (qty)	70	107	77	54	36	21	13	8	5
	MO 80 (qty)	80	123	88	61	41	25	15	9	6
	MO 95 (qty)	95	146	104	73	49	29	18	10	7
	MO 110 (qty)	110	169	120	84	56	34	21	12	8
	MO 140 (qty)	140	215	153	107	72	43	27	15	11
	MO 185 (qty)	185	284	203	142	95	57	35	20	14
	MO 225 (qty)	225	345	246	173	115	69	43	25	17
	MO 250 (qty)	250	383	274	192	128	77	48	27	19
	MO 300 (qty)	300	460	329	230	153	92	58	33	23

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About the Author

Sandeep Pawar,

General Manager - Product Management

Electrical Engineer with over 20 years of experience in Product Management and Application Engineering for Protection Relays, Power Quality Solutions, and Intelligent Motor Control Centres (MCCs). Possesses strong expertise in LV and MV power system protection schemes, motor protection, monitoring, and control applications. Well-versed in both conventional and intelligent motor management systems, with extensive knowledge of protection, control, and condition monitoring solutions.