Independent Lamp Controlgear Requirements for Mounting on Flammable Surfaces

Independent Lamp Controlgear Requirements for Mounting on Flammable Surfaces

Regulation 559.6 states:

"Independent lamp controlgear, e.g. ballasts Only independent lamp controlgear marked as suitable for independent use, according to the relevant standard, shall be used external to a luminaire.

Only the following are permitted to be mounted on a flammable surface:

• A 'class P' thermally protected ballast/transformer.
• A temperature declared thermally protected ballast/transformer.

NOTE: For an explanation of symbols used see Table 55.3."

This regulation addresses the installation of independent lamp controlgear, such as ballasts, that are not part of a luminaire but are instead installed separately. It specifies that only certain types of thermally protected ballasts or transformers can be mounted on flammable surfaces. These types include:

1. Class P Thermally Protected Ballast/Transformer: These devices have built-in thermal protection that ensures they shut off or reduce power when they reach a certain temperature, preventing overheating and reducing the risk of fire.
2. Temperature Declared Thermally Protected Ballast/Transformer: These devices are specifically rated for their maximum operating temperature, ensuring they can safely operate without exceeding the temperature limits declared.

The note refers to Table 55.3 for an explanation of the symbols used, which would provide further clarity on the types and specifications of these protections.

Frequently Asked Questions

Q: What are the requirements for mounting lamp controlgear on flammable surfaces according to BS 7671?

A: According to Regulation 559.6, only independent lamp controlgear marked as suitable for independent use shall be used external to a luminaire. Furthermore, only 'class P' thermally protected ballasts/transformers or temperature declared thermally protected ballasts/transformers are permitted to be mounted on a flammable surface.

Q: What is independent lamp controlgear?

A: Independent lamp controlgear refers to devices like ballasts or transformers that are used to regulate the power supply to lamps. These devices are not integrated into the lamp fixtures (luminaires) themselves but are installed separately (Regulation 559.6).

Q: Why is thermal protection important for lamp controlgear?

A: Thermal protection is crucial because it prevents the controlgear from overheating, which can lead to failures or fires, especially when mounted on flammable surfaces (Regulation 559.6).

Q: Can any ballast or transformer be mounted on a flammable surface?

A: No, only those ballasts or transformers that are 'class P' thermally protected or have a temperature declared thermal protection can be mounted on flammable surfaces (Regulation 559.6).

Q: Where can I find more information on the symbols used in this regulation?

A: You can refer to Table 55.3 in the BS 7671 regulations for detailed explanations of the symbols used in this context (Regulation 559.6).