Socket & See DL 420 Plus Manuale utente

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Instruction Manual & Specification

DL 420 Plus

17th Edition Loop Testing Kit

Issue Sn

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1. Safety

1.1 Equipment Markings

1.2 Operational Safety

The DL420Plus is designed to be used by skilled persons in accordance with safe

methods of work. If the DL420Plus is used in a manner not specified by Socket

and See, the protection provided by it may be impaired.

Inspect the product before using. If any damage is visible; such as cracks in the

casing, damage to any accessories, leads or probes, the unit should not be

used.

Although fully protected up to 600V AC, this tester is is for use on 230V AC 50Hz

circuits only.

This tester has been designed to be used with suitable PPE, including insulated

gloves in required.

Caution - refer to the instruction manual

Construction is double insulated

Product should be recycled as electronic waste

Conforms to EU standards

Measurement Category III is applicable to test and measuring circuits

connected after the source of the building’s low-voltage MAINS

installation. This part of the installation is expected to have a

minimum of two levels of over-current protective devices between

the transformer and connecting points of the measuring circuit.

Examples of CAT III are measurements on devices installed after the

main fuse or circuit breaker fixed within the building installation. Such

as junction boxes, switches and socket outlets.

CAT

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To maintain safety always check the tester on a known correctly wired live

socket outlet before and after use. Or use a suitable checkbox such as the

Socket and See CB400.

Note. The DL420Plus uses an intelligent loop test system that suppresses sudden

changes in value (such as voltage spikes). This means that when checking the

tester on a check box the unit should be switched off between changing

impedance values.

2. Description

The DL420Plus is a multi function 17th edition tester.

2.1 Features

●Quick and convenient non trip True loop impedance test

●High current True loop impedance for greater accuracy

●Mains voltage indication

●Incoming mains polarity test

●Calculated Prospective Fault Current (PFC)

●Socket wiring tester

●Clear and simple LCD display

●Carrying case included

●IECP UKA lead. (IEC 13A plug) connecting lead

●ITLS 400. Three pole fused test leads that terminate with prods or crocodile

clips

2.2 Indication

1 2 3 4

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1. Loop test function selected

2. PFC - PSC (prospective fault current - prospective short circuit current

selected)

3. Loop test mode selected - no trip (default setting) or Hi-I (high current)

4. HANDSFREE operation

5. Ohms symbol

6. Volts (AC)

7. Voltage measurement function L-N (default setting) L-E and N-E

8. Fault current

9. Battery status (shown in good condition)

10. Greater than (>) less than (<) indication

11. Tester has gone over its operating temperature

12. Wait, result calculation in progress

3. Usage

FRONT ON IMAGE REQD FOR

LABELLING

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3.1 Battery Installation

Unit requires 4 x AA batteries.

Ensure that all test leads are removed before installing batteries. Remove the

battery cover on the reverse of the unit. Install the new batteries ensuring

correct polarity as indicated. After installing batteries and before use switch on

the unit and check for correct operation.

3.2 Operation

Power ON/OFF. Pressing and releasing this button turns the DL420 on. Holding

the button down for longer than two seconds turns the unit off. An auto power

off feature is also incorporated to preserve battery life.

3.2.1 Socket Test

When the DL420 is first connected to a live socket it will automatically test the

socket wiring to confirm correct installation of the socket. If three GREEN LED’s

illuminate and no sound is emitted the socket wiring is correct and you may

proceed to the incoming supply polarity test, (step 3.2.2).

A fault with the socket wiring will be indicated by an audible alternating tone

and flashing LED’s , at least one of which will be red or orange. If a fault

indication is given DO NOT PROCEED! Investigation and remedial action is

required before any further tests can be carried out.

If a fault is indicated place your thumb on the Polarity Test Pad. This will initiate

the “fault location” function. With your thumb firmly on the pad check the

indication given by the LED’s against the chart in the rear of this manual. This will

diagnose the fault condition. Note: The colour of the LED’s may change when

the pad is touched.

3.2.2 Incoming Supply Polarity Test

With all three LED’s illuminated green place your thumb on the orange polarity

test pad. If the incoming supply polarity is correct there will be no change in

indication and you can proceed to mains voltage checks, (step 3.2.3).

If the supply polarity has been reversed the three LED’s will turn RED and flash. If

this happens stop testing immediately and notify the supply company.

For further information on incoming supply polarity refer to the technical

document on the Socket and See website.

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3.2.3 Mains Voltage Test

The mains AC voltage will be displayed automatically on the main LCD screen.

Check that the voltage is within the correct range 207 - 253 VAC.

The indicated voltage can be toggled between L-N (default), L-E and N-E by

using the voltage button.

Note: All tests are inhibited until the mains voltage appears in the display.

3.2.4 No Trip Loop Testing

This is the default setting for the DL420. This mode is most useful for testing either

at socket outlets, luminaires, or wiring terminals in installations where the circuit

under test is protected by an RCD.

No trip mode testing can be used with the IECP UKA lead when testing at 13A

sockets, or the ITLS 400 at all other points in the circuit. When using the ITLS test

leads the three coloured prods / clips should be connected to the

corresponding live, neutral and earth terminals.

A brief press of the test button will initiate the loop test, after a few seconds the

result will be displayed.

The no trip loop testing mode is a low current measurement technique and is

ideal for use on end circuits. However, low current measurements are more

susceptible to being effected by external factors such as contact resistance or

circuit noise. For this reason we recommend that multiple measurements are

taken and any isolated erroneous results are disregarded. The tester or the

supply should be powered off between consecutive tests.

For safety reasons no trip mode is recommended for all measurements on TT

systems.

3.2.5 No Trip PFC

Once the no trip loop test is complete pressing this button will calculate the

Prospective Fault Current (PFC) . The tester does this by dividing the L - N

voltage by the measured loop impedance.

3.2.6 High Current True Loop Impedance Testing

This is selected by pressing the Ze/DB button and can only be used with the ITLS

400 test leads in two lead mode. This is done by removing the prod of the blue

fuse holder and plugging the exposed 4mm connector into the back of the

green 4mm plug as shown below. Earth and neutral will now be connected and

ready to connect onto the earth conductor to be tested.

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using the voltage button.

As the true loop impedance test is a high current measurement it is more

accurate than the No trip loop test. It is recommended when measuring (Ze) at

the supply side of distribution boards and swithgear on non TT systems.

A brief press of the test button will initiate the loop test, after a few seconds the

result will be displayed.

3.2.7 PFC

Once the true loop test is complete pressing the PFC button will calculate the

Prospective Fault Current (PFC) . The tester does this by dividing the L - N

voltage by the measured true loop impedance.

3.2.8 Handsfree Function

The DL420 has a handsfree function that can be particularly useful when testing

and holding test probes. The function is activated by holding down the test

button for two seconds.

Handsfree in No Trip Mode:

The tester will automatically conduct the socket wiring test upon connection of

the live supply. If all is well it will immediately initiate a loop test. Once the test is

complete the result will be displayed for a few seconds before the display

reverts to the L-N voltage. The loop test result can be recalled by pressing the

No Trip button.

When using handsfree mode with the ITLS 400 test leads, always connect the

earth and neutral poles before the live. Otherwise a polarity fault will be

indicated and further testing will be inhibited.

Handsfree in High Current Loop Testing Mode:The tester will automatically

conduct a loop test upon connection to the live supply and display the result.

The supply voltage can be recalled by pressing the voltage button.

For any further information on Earth fault loop testing, earthing arrangements

and supply polarity refer to the Socket and See website.

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LED’s will flash to indicate a fault.

NC = No connection

Condition

Number

Wiring

Conditions Supply Terminal LED Buzzer

N E L

Socket Wiring

1 Correct N E L None

2 L-E reverse N L E Warble

3L-N-E

miswire E L N Warble

4 L-N reverse L E N Warble

5L-N-E

miswire L N E Warble

6Faulty N/L-E

miswire NC L N Warble

7Faulty N/E

miswire NC N L Warble

8 Faulty N NC E L Warble

9Faulty N/L-E

reverse NC L E Warble

10 Faulty E/L-N

reverse L NC N Warble

11 Faulty E N NC L Warble

12 Faulty E/N

miswire E NC L Warble

13 Faulty E/L-N

miswire L NC E Warble

14 Faulty L/N-E

miswire L N NC Warble

15 Faulty L/E

miswire N L NC Warble

16 Faulty L/N-E

miswire E L NC Warble

17 Faulty L/N

miswire L E NC Warble

18 No mains NC NC NC None

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4. Maintenance and Service

If required, clean with a damp cloth and mild detergent. Do not use abrasives

or solvents.

There are no user serviceable parts.

Contact Socket and See for parts and technical assistance.

Socket and See

Century Road

High Carr Business Park

Newcastle

Staffordshire, UK

ST5 7UG

Tel: +44 (0) 1782 567096

Fax: +44 (0) 1782 567095

Email: [email protected]

Website: www.socketandsee.co.uk

Specification

Wiring Test

Detects missing E or N (>15kΩ)

Detects L-E or L-N swap

Detects Network Supply Live - Earth/Neutral reversal by use of Polarity Test Pad.

Phase - Neutral voltage measurement +1% + 1V AC

Phase - Earth voltage measurement +1% + 1V AC

Neutral - Earth voltage measurement +1% + 1V AC

Loop Test

(No trip mode, 3 wire testing, Phase - Neutral - Earth all connected)

Test current <15mA at 253V AC

Range Accuracy

0.00 to 9.99 Ω + 5% + 5 digits

10.00 to 99.9 Ω + 3% + 3 digits

100.00 to 500 Ω + 3% + 3 digits

(High current mode 2 wire testing Phase - Neutral or Phase - Earth connected

using true impedance measurement

Range Accuracy

0.00 to 9.99 Ω + 3% + 3 digits

PFC Measurement

10A - 19.9kA

This is calculated using the loop test

measurement but will be inherently

more accurate than traditional

methods as the test is of impedance

not solely resistance.

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