Kaco blueplanet 3.0 TL1 User manual

Operating Instructions
English translation of
German original
blueplanet
3.0 TL1 | 3.5 TL1
3.7 TL1 | 4.0 TL1
4.6 TL1

EN
Operating Instructions for KACO blueplanet .-. TL Page 
Operating Instructions
for Installation Engineers and
Operators
Contents
 General information .................................
. About this document............................................
. Layout of Instructions...........................................
 Safety ......................................................... 
. Proper use.................................................................
. Protection features ................................................
. Trademark.................................................................
. Additional information.........................................
 Description ................................................ 
. Mode of Operation ................................................ 
. Diagram ..................................................................... 
 Technical Data ......................................... 
. Electrical Data........................................................ 
. Mechanical data.....................................................
 Transportation and Delivery ...................
. Delivery.....................................................................
. Transportation........................................................
 Mounting ..................................................
. Unpacking............................................................... 
. Mounting..................................................................
 Installation............................................... 
. Opening the connection area.......................... 
. Making the electrical connection...................
. Connecting the PV generator..........................
. Connecting the interfaces.................................
. Sealing the connection area ............................
. Starting up the inverter......................................
 Conguration and Operation................. 
. Controls....................................................................
. Initial start-up ........................................................
. Menu structure......................................................
. Monitor inverter................................................... 
. Performing the software update....................
 Maintenance/Troubleshooting .............. 
. Visual inspection...................................................
. Cleaning...................................................................
. Shutting down for maintenance and
troubleshooting................................................... 
. Faults........................................................................ 
. Messages on the display and
the "Fault" LED...................................................... 
 Service...................................................... 
 Shutdown/Disassembly...........................
. Shutdown................................................................ 
. Uninstallation ........................................................ 
. Disassembly ...........................................................
 Disposal ................................................... 
 EU Declaration of Conformity................ 

ENEN
General information
Page  Operating Instructions for KACO blueplanet .-. TL
 General information
. About this document
WARNING
Improper handling of the inverter can be hazardous
›You must read and understand the operating instructions before you can install and use the
inverter safely.
.. Other applicable documents
During installation, observe all assembly and installation instructions for components and other parts of the system.
These instructions also apply to the equipment, related components and other parts of the system.
Some of the documents which are required for the registration and approval of your photovoltaic (PV) system are
included with the operating instructions.
.. Storing the documents
These instructions and other documents must be stored near the system and be available at all times.
. Layout of Instructions
.. Symbols used
General hazard Risk of re or explosion
High voltage Risk of burns
Authorised electrician Only authorised electricians are permitted to carry out tasks indicated with this
symbol.
.. Safety warnings symbols guide
DANGER
High risk
Failure to observe this warning will lead directly to serious bodily injury or death.
WARNING
Potential risk
Failure to observe this warning may lead to serious bodily injury or death.
CAUTION
Low-risk hazard
Failure to observe this warning will lead to minor or moderate bodily injury.
CAUTION
Risk of damage to property
Failure to observe this warning will lead to property damage.

EN
Safety
Operating Instructions for KACO blueplanet .-. TL Page 
.. Additional information symbols
NOTE
Useful information and notes
EN Country-specic function
Functions restricted to one or more countries are labelled with country codes in accordance with
ISO-.
.. Instructions symbols guide
Instructions
ඣPrerequisites before carrying out the following instructions
"Carry out step.
"(Additional steps, if applicable)
» Result of the step(s) (optional)
 Safety
DANGER
Lethal voltages are still present in the terminals and cables of the inverter even after the
inverter has been switched o and disconnected.
Severe injuries or death if the cables and/or terminals in the inverter are touched.
The inverter is only permitted to be opened and serviced by an authorised electrician.
›Keep the inverter closed when the unit is in operation.
›Do not make any modications to the inverter.
The electrician is responsible for observing all existing standards and regulations.
• Keep unauthorised persons away from the inverter and PV system.
• In particular, be sure to observe IEC---: "Requirements for special types of business premises, rooms
and installations - Solar-Photovoltaic-(PV) Power Supply Systems.
• Ensure operational safety by providing proper grounding, conductor dimensioning and appropriate protection
against short circuiting.
• Observe all safety instructions on the inverter and in these operating instructions.
• Switch o all voltage sources and secure them against being inadvertently switched back on before performing
visual inspections and maintenance.
• When taking measurements while the inverter is live:
–Do not touch the electrical connections.
–Remove all jewellery from your wrists and ngers.
–Ensure that the testing equipment is in safe operating condition.
• Stand on an insulated surface when working on the inverter.
• Modications to the surroundings of the inverter must comply with the applicable national and local standards.
• When working on the PV generator, it is also necessary to switch o the DC voltage with the DC isolator switch in
addition to disconnecting the PV generator from the grid.

ENEN
Safety
Page  Operating Instructions for KACO blueplanet .-. TL
. Proper use
The inverter converts the DC voltage generated by the PV modules into AC voltage and feeds it into the grid. The
inverter is built according to the latest technological standards and safety regulations. Nevertheless, improper use
may cause lethal hazards for the operator or third parties, or may result in damage to the unit and other property.
Operate the inverter only with a permanent connection to the public power grid.
Any other or additional use of the device is not considered intended use. This includes:
• Mobile use,
• Use in potentially explosive atmospheres,
• Use in rooms where the humidity is higher than %,
• Operation outside the specications intended by the manufacturer,
• Islanding operation.
. Protection features
For your safety, the following monitoring and protective functions are integrated into inverters:
• Overvoltage conductors/varistors to protect the power semiconductors from high-energy transients on the grid
and generator side,
• Temperature monitoring of the semiconductor,
• EMC lters to protect the inverter from high-frequency grid interference,
• Grid-side grounded varistors to protect the inverter against burst and surge pulses,
• Islanding detection according to the current standards.
. Trademark
The software of the inverter uses the MD Message Digest algorithm of RSA Data Security, Inc. The devices uses the
open source operating system FreeRTOS ..
. Additional information
NOTE
The EU Declaration of Conformity can be found in the appendix. For information on grid coupling,
grid protection and safety parameters along with more detailed instructions see our web site at
http://www.kaco-newenergy.de/.

EN
Description
Operating Instructions for KACO blueplanet .-. TL Page 
 Description
. Mode of Operation
The inverter converts the DC voltage generated by the PV modules into AC voltage and feeds it into the grid. The
feed-in process begins when there is sucient sunlight and a specic minimum voltage is present in the inverter.
If, as it gets dark, the voltage drops below the minimum voltage value, the feed-in mode ends and the inverter
switches o.
. Diagram



Figure : Inverter diagram
Key
1 Control panel 4 DC connection (DC connector)
2 Cover for the connection area 5 AC connection (5-pole connector)
3 DC isolator switch
.. Mechanical components
DC isolator switch
The DC isolator switch is located on the underside of the inverter. The DC isolator switch is used to disconnect the
inverter from the PV generator in order to carry out service.
Disconnecting the inverter from the PV generator
"Switch the DC isolator switches from  (ON) to  (OFF).
Connecting the inverter to the PV generator
"Switch the DC isolator switches from  (OFF) to  (ON).
.. Electrical functions
Fault signal relay/Priwatt
A potential-free relay contact is integrated in the inverter. Use this contact for one of the following functions:
Fault signal relay
The potential-free relay contact closes as soon as there is a fault during operation. You use this function, for example,
to signal a fault visually or acoustically.

ENEN
Description
Page  Operating Instructions for KACO blueplanet .-. TL
Priwatt
The energy that is provided by the PV system can be put to use directly by the appliances that are connected in your
home. In Priwatt mode, the potential-free contact takes care of this function.
The potential-free contact switches larger appliances (e.g. air conditioning units) on and o. This requires an external
power supply (max.  V DC) and an external load relay. Both can be obtained as part of the Priwatt-switch from your
specialist retailer.
When the function is active, either the remaining runtime (in hours and minutes) or the shutdown threshold (in kW)
is displayed on the start screen depending on the operating mode selected. The "Priwatt" function is not active in
the unit's factory default state. The option can be congured in the Settings menu.
.. Interfaces
You congure the interfaces and the web server in the Settings menu.
The inverter has the following interfaces for communication and remote monitoring:
Ethernet interface
Monitoring can occur directly on the unit using the integrated Ethernet interface. A local web server is installed in
the unit for this purpose.
For monitoring a system comprising several inverters, we recommend you use an external data logging and moni-
toring system.
RS interface
Use this monitoring option if you cannot check the functioning of the system on-site on a regular basis, e.g. if your
place of residence is located a great distance from the system. To connect the RS interface, contact your author-
ised electrician.
For monitoring your PV system using the RS interface, KACO new energy GmbH oers monitoring devices:
Only the RS interface continues to transmit data if the inverter in an inverter group fails.
USB interface
The USB connection of the inverter is a type A socket. It is located on the connection circuit board behind the cover
for the connection area. The USB connection is specied to draw mA of power. Use the USB interface for reading
out stored operating data and loading software updates using a FAT-formatted USB stick.
"Inverter O" input
If Powador protect is installed as a central grid and system protection, the fail-safe disconnection of suitable
Powador or blueplanet inverters from the public grid can be initiated by a digital signal instead of tie circuit-break-
ers. This requires the inverters in the photovoltaic system to be connected to the Powador protect. For information
on the installation and use see this manual, the Powador protect manual and the instructions for use of the Powador
protect on the KACO new energy website.
S interface (optional)
The S interface transmits pulses between a pulsing counter and a tari metering unit. It is a galvanically isolated
transistor output. It is designed according to DIN EN -:- (pulse output devices for electromechanical
and electronic meters).
The S interface pulse rate can be chosen in three unit intervals (, , and , pulses/kWh).
The optional interface card is available from the service department of KACO new energy.

EN
Description
Operating Instructions for KACO blueplanet .-. TL Page 
.. KACO inverter as part of a PV system
KWhKWh
PV generator PV generator
Inverter with
DC isolator switch
Inverter with
DC isolator switch
Line protection Line protec-
tion
Consumer
Feed-in meter
Reference counter
Main switch
Grid connection point
Selective main switch
Figure : Circuit diagram of a system with two inverters
Summary of the components
PV generator
The PV generator, i.e. the PV modules, converts the radiant energy of sunlight into electrical energy.
DC connection
The PV generator is connected directly to the inverter's DC connection. The DC connection can be used to
connect two strings.
DC isolator switch
Use the DC isolator switch to disconnect the inverter from all power sources on the PV generator side.
Grid fuses
Use only specic PV rated fuses.
Feed-in meter
The feed-in meter is specied and installed by the power supply company. Some power supply companies also
allow the installation of your own calibrated meters.
Selective main switch
If you have any questions about the selective main switch, contact your power supply company.

ENEN
Technical Data
Page  Operating Instructions for KACO blueplanet .-. TL
 Technical Data
. Electrical Data
Product: KACO blueplanet 3.0 TL1 M1 3.0 TL1 3.5 TL1
Input levels
DC MPP range from [V] to [V]* 280 ... 510 150 ... 510 165 ... 510
Operating range from [V] to [V] 125 ... 550
Starting voltage [V]** 150
Open circuit voltage [V] 600
Rated current max. [A] 11 2 x 11 2 x 11
Max. power per tracker [W] 3100 3100 3600
Number of strings 1 2 2
Number of MPP controls 1 2 2
Max. short-circuit current [A] 25
Polarity safeguard Short-circuit diode
Overvoltage protection class/category III / II
*At DC voltages below the MPP range the maximum rated current reduces the maximum DC rated power.
**For PV generators with MPP voltages below the MPP range of the inverter, the start voltage can be set in the menu.
Output levels
Rated power [VA] 3000 3000 3450
Grid voltage [V] 230 (1/N/PE)
Rated current [A] 13.0 13.0 15.0
Rated frequency [Hz] 50
cos phi 1 – 0.3 (ind/cap)
Number of feed-in phases 1
Distortion factor [%] 5.5
Overvoltage protection class/category III / III
General electrical data
Max. eciency [%] 97.2 97.2 97.2
European eciency [%] 96.5 96.6 96.7
Make current [A] and ON duration [ms] 1.82
Internal consumption: night [W] <4
Feed-in starts at [W] 20
Circuit design Transformerless
Grid monitoring Country-specic
Ground fault monitoring Yes

EN
Technical Data
Operating Instructions for KACO blueplanet .-. TL Page 
Product: KACO blueplanet 3.7 TL1 4.0 TL1 4.6 TL1
Input levels
DC MPP range from [V] to [V]* 170 ... 510 185 ... 510 215 ... 510
Operating range from [V] to [V] 125 ... 550
Starting voltage [V]** 150
Open circuit voltage [V] 600
Rated current max. [A] 2 x 11
Max. power per tracker [W] 3800 4100 4700
Number of strings 2
Number of MPP controls 2
Max. short-circuit current [A] 25
Polarity safeguard Short-circuit diode
Overvoltage protection class/category III / II
*At DC voltages below the MPP range the maximum rated current reduces the maximum DC rated power.
**For PV generators with MPP voltages below the MPP range of the inverter, the start voltage can be set in the menu.
Output levels
Rated power [VA] 3680 4000 4595
Grid voltage [V] 230 (1/N/PE)
Rated current [A] 16.0 17.5 20.0
Rated frequency [Hz] 50
cos phi 1 – 0.3 (ind/cap)
Number of feed-in phases 1
Distortion factor [%] 5.5
Overvoltage protection class/category III / III
General electrical data
Max. eciency [%] 97.2 97.2 97.2
European eciency [%] 96.7 96.7 96.8
Make current [A] and ON duration [ms] 1.82
Internal consumption: night [W] <4
Feed-in starts at [W] 20
Circuit design Transformerless
Grid monitoring Country-specic
Ground fault monitoring Yes

ENEN
Technical Data
Page  Operating Instructions for KACO blueplanet .-. TL
. Mechanical data
Product: KACO blueplanet 3.0 TL1 M1 3.0 TL1 3.5 TL1 - 4.6 TL1
Display Graphical LCD, 3 LEDs
Controls -way button + 2 buttons
Interfaces 2x Ethernet, USB, RS485
optional via interface card: S0, 4-DI, 4-D0
Fault signal relay Potential-free NO contact, max. 30 V / 1A
AC connection 5-pole connector
DC connections SUNCLIX connector
Ambient temperature range [°C] -25 ... +60, derating from +40
Humidity range (non-condensing) [%] 0 ... 95
Maximum installation elevation [m above sea level] 2,000
Temperature monitoring Yes
Cooling: free convection (K) / fan (L) No fan
natural convection
Maintenance-free
interior fan
Protection rating according to EN 60529 IP54
Degree of contamination 2
Noise emission [dB(A)] < 35
DC isolator switch Built-in
Housing Plastic (ASA/PC), aluminium
H x W x D [mm] 560 x 367 x 225
Total weight [kg] 15 16.5 18
Table 1: Mechanical data

EN
Transportation and Delivery
Operating Instructions for KACO blueplanet .-. TL Page 
 Transportation and Delivery
. Delivery
Every inverter leaves our factory in proper electrical and mechanical condition.
Special packaging ensures that the units are transported safely. The shipping company is responsible for any trans-
port damage that occurs.
Scope of delivery
•  inverters
•  installation kit
•  documentation set
Checking your delivery
. Inspect your inverter thoroughly.
. Immediately notify the shipping company in case of the following:
–Damage to the packaging that indicates that the inverter may have been damaged,
–obvious damage to the inverter.
. Send a damage report to the shipping company immediately.
The damage report must be delivered to the shipping company in writing within six days of receiving the inverter.
We will be glad to help you if necessary.
. Transportation
WARNING
Impact hazard, risk of breakage to the inverter
›Pack the inverter securely for transport.
›Carefully transport the inverter using the the carrying handles of the boxes.
›Do not subject the inverter to shocks.
For safe transportation of the inverter, use the holding openings in the carton.
Figure : Transportation of the inverter

ENEN
Mounting
Page  Operating Instructions for KACO blueplanet .-. TL
 Mounting
DANGER
Risk of fatal injury from re or explosions
Fire caused by ammable or explosive materials in the vicinity of the inverter can lead to serious
injuries.
›Do not mount the inverter in an area at risk of explosion or in the vicinity of highly ammable mate-
rials.
CAUTION
Risk of burns from hot housing components.
Coming into contact with the housing can cause burns.
› Mount the inverter so that it cannot be touched unintentionally.
Installation space
• As dry as possible, climate-controlled, with the waste heat dissipated away from the inverter,
• Unobstructed air circulation,
• When installing the unit in a control cabinet, provide forced ventilation so that the heat is suciently dissipated,
• Access to the inverter must also be possible without additional tools,
• For outdoor installation, t the inverters in such a way to ensure that they are protected against direct sunlight,
moisture - and dust penetration,
• For easy operation, ensure during installation that the display is slightly below eye level.
Wall
• With sucient load-bearing capacity,
• Accessible for installation and maintenance,
• Made from heat-resistant material (up to  °C),
• Flame resistant,
• Minimum clearances to be observed during assembly: see Figure  on page .
NOTE
Access by maintenance personnel for service
Any additional costs arising from unfavourable structural or mounting conditions shall be billed to
the customer.
CAUTION
Property damage due to gases that have an abrasive eect on surfaces when they come into
contact with ambient humidity caused by weather conditions
The inverter housing can be severely damaged by gases (ammonia, sulphur, etc.) if it comes
into contact with ambient humidity caused by weather conditions.
If the inverter is exposed to gases, it must be mounted so that it can be seen at all times.
›Perform regular visual inspections.
›Immediately remove any moisture from the housing.
›Take care to ensure sucient ventilation of the inverter.
›Immediately remove dirt, especially on vents.
›Failure to observe these warnings may lead to inverter damage which is not covered by the KACO
new energy GmbH manufacturer warranty.

EN
Mounting
Operating Instructions for KACO blueplanet .-. TL Page 
NOTE
Power reduction due to heat accumulation.
If the recommended minimum clearances are not observed, the inverter may go into power regula-
tion mode due to insucient ventilation and the resulting heat build-up.
›Maintain minimum clearances.
›Ensure sucient heat dissipation.
<20°
Figure : Instructions for wall mounting Figure : Inverter for outdoor installation
CAUTION
Use suitable mounting parts.
›Use only the supplied mounting parts.
›Mount the inverter upright on a vertical wall only.
›For a free-standing mounting an incline of ° is allowed.

ENEN
Mounting
Page  Operating Instructions for KACO blueplanet .-. TL
. Unpacking
CAUTION
The inverter is very heavy – risk of injury!
› Please pay attention to the weight, higher centre of gravity and areas for lifting the unit.
› Select suitable mounting location and mounting base.
› Use mounting material corresponding to or included with the base for mounting the inverter.
› The inverter should be always carried by  people.




Figure : Unpacking the inverter Figure : Lifting the inverter
Key
1 Carton 4 Centre of gravity of the inverter
2 Protective packaging 5 Areas for lifting the unit
3 Inverter
Unpacking the inverter
. Open carton at the front.
. Remove installation material and documentation.
. To take out the inverter, break the upper protective packaging from the side outwards.
. Take out the Inverter together with the bottom protective packaging of the carton.
. Remove the protective packaging from the unit and place back into the carton.
. Lift the inverter from the provided areas (see Figure ).
» Continue mounting the inverter.

EN
Mounting
Operating Instructions for KACO blueplanet .-. TL Page 
. Mounting
150mm 150mm
250mm
500 mm
700 mm
500 mm
700 mm
 mm
 mm
 mm


 mm
 mm




Figure : Minimum distances/mounting of inverter
Key
1 Cover for the connection area 4 Nozzle (x3)
2 Screws for mounting (x Torx) 5 Screws for mounting (x3)
3 Suspension brackets 6 Hole for securing the inverter
Mounting the inverter
. Mark the position of the upper boreholes on the wall in accordance with the dimensions in Fig.  or using the
suspension brackets on the back of the housing.
. NOTE: Observe the minimum clearances between inverters ( mm), or the inverter and the ceiling/oor
( mm) as well as the side clearances ( mm and  mm).
. Fit wall plugs.
. Screw in the top screws for assembly in accordance at the specied distance ( mm) from the wall.
. Suspend the inverters on the suspension brackets from the screws.
. Unscrew and remove the xing screws from the cover of the connection area.
. Lower the cover of the connection area.
. Variant : Mark the position of the bottom hole.
. Remove the inverter and t wall plug to secure the inverter.
. Fit the inverters back onto the top screws and fasten to the wall using the bottom screw.
. Variant : Remove the slider. (See Figure  on page )
. Drill hole according to dowel size and mount on the wall by fastening screw.
. Insert slider.
. Fit the cover onto the housing.
. Screw in the screws to fasten the cover.
. The mounting of the inverter is complete. Continue with the installation.

ENEN
Installation
Page  Operating Instructions for KACO blueplanet .-. TL
Authorised electrician
 Installation
DANGER
Lethal voltages are still present in the terminals and cables of the inverter even after the
inverter has been switched o and disconnected.
Severe injuries or death may occur if the cables and terminals in the inverter are touched.
Only appropriately qualied and authorised electricians may open and install the inverter.
The inverter must be mounted in a xed position before being connected electrically.
›Observe all safety regulations and current technical connection specications of the responsible
power supply company.
›Disconnect the AC and DC sides.
›Secure both sides against being inadvertently switched back on.
›Ensure that the AC and DC sides are completely isolated and voltage free.
›Connect the inverter only after the aforementioned steps have been taken.
. Opening the connection area
NOTE
Only remove the cover for the connection area (blue). Opening the housing cover (grey) will invali-
date the warranty.
123
Figure : Disassemble the cover Figure : Remove the cover Figure : Remove the slider
Key
1 Screws for mounting (x2) 3 Slider
2 Cover for the connection area
Opening the connection area
ඣYou have mounted the inverter on the wall.
. Set the DC isolator switch to "OFF".
2. Unscrew and remove the screws for xing on the cover for the connection area.
. Pull the cover downwards.
. Pull the slider out and upwards.
» Congure AC connector for connection.

EN
Installation
Operating Instructions for KACO blueplanet .-. TL Page 
Authorised electrician
.. Conguring the AC connector

 
0,47 In
(12mm)
1,97 In
(50mm)
0,31 In
(8mm)
4
-phase
connection
single-phase
connection
Figure : AC connector Figure : Remove cable insulation Figure : Connect wires to the contact
carrier
1 Nm
1 Nm
-phase
connection
single-phase
connection
CLICK !
CLICK !
30
6,5 Nm
Figure : Tighten screws Figure : Press contact carrier into the
housing
Figure : Tighten the cable screw
tting
Key
1 cable tting 4 Contact plug
2 Seal 5 Cable lengths
3 Housing
NOTE
If your grid operator or power supply company requests -phase power monitoring, a -phase
(ve-pin) power supply is required. The -phase monitoring must be also activated in the„Parame-
ters“ menu (see Chapter . on page ). Before installation, ask your grid operator or power supply
company about the necessary grid connection.
Conguring the AC connector
ඣConnection area opened.
. Slide the cable tting over the cable.
. Select seal according to cable diameter used ( ...  mm/  ...  mm/  ...  mm).
"Slide the housing and seal over the cable.
. Remove  mm of the outer cladding.
. Shorten the wires N, L by  mm if a single-phase connection is present or shorten the wires N, L, L, L by the
same length in case of a -phase connection.
. Strip the wires N, L by  mm if a single-phase connection is present or shorten the wires N, L, L, L by the
same length in case of a -phase connection.

ENEN
Installation
Page  Operating Instructions for KACO blueplanet .-. TL
Authorised electrician
. Flexible wires must be tted with wire sleeves in accordance with DIN .
. Insert wires into the contacts in accordance with the markings on the contact carrier.
. Tighten the screws on the contact carrier with  Nm.
. Press contact carriers into the housing with an audible "click".
. Secure the housing with no.  open wrench.
Tighten the cable tting using a torque of . Nm.
» Make the electrical connections.
. Making the electrical connection
Make the connection for the PV generator and grid connection to the underside of the housing via the connector.
DC

Figure : Connection area: electrical connection
Key
1 DC isolator switch 3 Device connector
2 DC connector for PV generator
.. Connecting the inverter to the power grid
The power connection wires are connected on the right of the connection area (see Figure  on page ).
DANGER
Risk of fatal injury due to electric shock
Severe injury or death will result if the live connections are touched.
›Disconnect the inverter completely from all power sources before connecting up to the grid.
›Make sure that the device is isolated from the public power supply and the system power supply
before starting work.
Recommended conductor cross-sections and fuse protection of NYM cables for xed wiring according to VDE
 part 
For cable lengths up to m, use the specied conductor cross-sections. Longer cable lengths require larger conduc-
tor cross-sections.
Model Conductor
cross-section
Fuse protection: gL safety fuses
or comparable automatic circuit breakers
KACO blueplanet 3.0-4.6 TL1 6.0 mm² 25 A for 4.0 mm² conductor cross-section
Table 2: Recommended conductor cross-sections and fuse protection of NYM cables