Frequently Asked Questions (FAQs)

TP(a) or TP (b)

What is the difference between TP(a) and TP(b)?

Panels that form part of a ceiling (i.e. recessed) must be either TP(a) or TP(b) rated and be installed in accordance with the Part B regulations relating to that rating.’

TP(a) rating

Thermoplastic materials undergo specific tests to certify their ability to withstand the application of heat and fire. The requirements are established by Building Regulations Approved Document B, which sets out the fire safety of buildings. Section B2 covers internal fire spread.

TP(a) usually relates to polycarbonate diffusers with a thickness of at least 3mm. The testing procedure requires that the material self-extinguishes and any flaming and afterglow must not exceed five seconds, once the source of flame is removed.

There is no restriction on the use of TP(a)-rated diffuser material.

TP(b) rating

TP(b) materials tend to be acrylic or polystyrene. It is a more problematic material because its use is limited by the extent of the installation. The testing for TP(b) requires a flame to be presented to the material. If the material combusts, the spread of flame must be no more than 50mm per minute – that’s 12 minutes to completely blanket a 600mm wide panel.

In circulation spaces, the total area of diffuser panels must not exceed 15 per cent of the total floor area. The maximum area of one diffuser, or group of diffusers, must not exceed 5m x 5m. There must be a 3m spacing between each 5m x 5m diffuser grouping.


What Type of dimming do Ansell offer & how are these wired?

We offer Switch Dim, DSI, Dali & 1-10v (please visit the below links for brief explanation of each + simple wiring diagram)


What is Corridor Function?

Corridor Function is a setting of DD dimmable control gear for operation with a PIR (standard on/off). Dimmable control gears reduces light output to 3-5% when an area is unoccupied and increases to full light output when PIR is activated.

Can Ansell LED fittings be dimmed?

Yes, with equipment that facilitates this, normally a dimmable LED driver, along with a suitable dimmer switch. All of our LED products are highlighted in our catalogue as either “dimmable” or “non-dimmable”

Dimming LED Strips

We have many enquiries, asking whether the LED strip can be dimmed. This can be achieved, with both Cobra & Adder, by using the ADDIM75W/12V (switch dim or 1-10V only). Please see ADDIM75W12V Dimmable LED Driver Datasheet and Push-to-Dim Dimming,


How are the microwave sensors set up / adjusted?

Please see the list of fittings & their respective microwave sensors. Installation instructions for each sensor are available for download.



How much strip can be run from 1 driver?

AD30W/12V 4mtrs (Adder) 2mtrs (Cobra)
AD75W/12V 10mtrs (Adder) 5mtrs (Cobra)
ADDIM75W/12V 10mtrs (Adder) 5mtrs (Cobra)

Can the strip be cut?

Yes, but only at the cutting points. The remainder of the strip would become a dead end.

When would the amplifier (ACLED/AMP/TOUCH) be used?

An amplifier can be added to synchronise larger installations. 1 amplifier is required every 5mtrs, after the initial run on Cobra RGB & every 10mtrs after the initial run on Adder.

Tutorial video

If you are still having difficulty installing our LED strip, please refer to our tutorial video:

What are the wiring requirements for each of your LED strip range? (RGB / White / White (Dimmable)

Please refer to the relevant document 

RGB - Controller and Amplifer Wiring

White - Wiring

White (Dimmable)


What are Self-Test Emergency Light Fittings?

These fittings utilise an accurate internal clock which is programmed to interrupt the permanent mains supply at set intervals, thus initiating emergency lighting tests. These units are supplied pre-programmed to initiate short duration tests once every month, a one third duration test after six months and a full duration test once every 12 months.

Read the installation instructions here.


What is Series & Parallel Wiring?

LED drivers are supplied either Constant Current or Constant Voltage. Both require the LED chips / modules to be wired differently (CC- Series; CV- Parallel).


Series Wiring
Parallel Wiring


What do bathroom zones signify?

Bathroom luminaire installations must comply with legislation. Please see section 701 of BS EN 7671:2008 (17th Edition Wiring Regulations)

Zone 0 – This is inside the bath or shower. Any fitting used in these areas must be SELV and IPX8.

Zone 1 – This is the area above the bath to a height of 2.25m from the floor. In this zone a minimum rating of IPX4 is required. If a 230V luminaire is used, the circuit must be protected by a 30mA RCD.

Zone 2 – This area extends a further 0.6m outside Zone 1. In this zone a minimum rating of IPX4 is required. It is also recommended to have luminaires with a rating of IPX4 around the wash basin (with 0.6m radius of the tap).

Outside Zones - Anywhere outside Zones 0, 1 and 2 are classed as outside zones (excluding specific areas) providing water jets are not used, so the minimum rating is IPX0. If water jets are to be used a minimum of IPX5 is required.

Full details can be found in the IEE Wiring Regulations.


What is LED lighting?

A light emiting diode is a device consisting of a semiconductor which emits light energy when an electrical current is passed through it. LEDs can be used for a variety of lighting applications.

What is Anti-Ligature?

This is a luminaire that is free from points where a cord could be fastened to create a ligature point.

For further information, please refer to our Technical A-Z, which can be found at the back of our current catalogue & and also viewed as a PDF.

What is a Beam Angle?

The beam angle is the point at which the light output Lumens drop below 50% of the total light output. LED beam angles typically vary between 10° - 120°. The beam angle is the area where the light is at its most intense.

What is LM80?

All light sources degrade over time. LM80 is the method for measuring how much lumen depreciation the light source will suffer. This is not to be confused with an estimation of life. LED's typically do not fail as they have no filament to burn to end their life, rather degrade beyond useful life output.


What is IK Rating?

IK rating indicates the protection against mechanical impact.

IEC/TR 62696:2011(E) covers the testing and classification of luminaires according to IEC 62262.

The application of an IK rating to a luminaire is considered to be a performance issue and is not directly related to the safety provisions of IEC 60598 standards covering luminaire safety.

Application of the IK code as specified on the International Electrotechnical Commission (IEC) Technical Report - Edition 1.0 2011-04:

IK Rating Degree of Protection

IK00 No Protection
IK01 Protected against 0.14 joules impact. Equivalent to impact of 0.25 kg mass dropped from 56 mm above impacted surface
IK02 Protected against 0.2 joules impact. Equivalent to impact of 0.25 kg mass dropped from 80 mm above impacted surface
IK03 Protected against 0.35 joules impact. Equivalent to impact of 0.25 kg mass dropped from 140 mm above impacted surface
IK04 Protected against 0.5 joules impact. Equivalent to impact of 0.25 kg mass dropped from 200 mm above impacted surface
IK05 Protected against 0.7 joules impact. Equivalent to impact of 0.25 kg mass dropped from 280 mm above impacted surface
IK06 Protected against 0.7 joules impact. Equivalent to impact of 0.25 kg mass dropped from 280 mm above impacted surface
IK07 Protected against 2 joules impact. Equivalent to impact of 0.5 kg mass dropped from 400 mm above impacted surface
IK08 Protected against 5 joules impact. Equivalent to impact of 1.7 kg mass dropped from 300 mm above impacted surface
IK09 Protected against 10 joules impact. Equivalent to impact of 5 kg mass dropped from 200 mm above impacted surface
IK10 Protected against 20 joules impact. Equivalent to impact of 5 kg mass dropped from 400 mm above impacted surface


I have a question regarding the OCTO range

If you have any questions regarding the OCTO product range please take a look at the OCTO FAQs: