Buildings Energy Efficiency Ordinance

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1. 1.Should the submission of Form of Compliance is required when a 800A MCCB is installed at the ACB cubicle in a residential building solely for the purpose of battery charging for electric car?
   Pursuant to Schedule 3 of the Buildings Energy Efficiency Ordinance, the work is regarded as a "Major Retrofitting Works" if the work involves addition of a complete electrical circuit at rating of 400A or above. Based on Table 10.1 of the latest edition of the Building Energy Code, relevant clauses of the BEC regarding power distribution losses, total power factor, total harmonic distortion, balancing of single -phase loads, metering & monitoring facilities should be followed. The responsible person of the works should obtain the Form of Compliance from a Registered Energy Assessor within 2 months after completion of the works.

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2. 2.Should the requirement on the provision of metering and monitoring facilities in Figure 7.4 (b) vii} of P.111 of TG-BEC2015 only applied to the BEC 2015 Edition and it is not applicable to the BEC 2012 Edition (Rev 1)?
   The requirement on the provision of metering and monitoring facilities had already been stipulated in BEC 2012. In the issuance of BEC 2012 (Rev.1) and BEC 2015, such requirement had not been further amended or tightened. Therefore, the above mentioned TG Figure is also applicable to the BEC 2012 and BEC 2012 (Rev. 1).

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3. 3.If the power factor and harmonic corrective devices are supplied and installed by the future tenant, should any addition document be required in the stage two declaration submission?
   During the stage two declaration submission, if the power factor and harmonic corrective devices are supplied and installed by future tenant, the document proof such as tenancy agreement should be submitted also showing that the provision would be taken up by the tenant.

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4. 4.What is the requirement and principle of “125%” on the motor sizing as stipulated in Section 7.5 of the BEC?
   Guidance on the compliance with motor sizing requirement is shown in the latest edition of the TG-BEC. Further examples and elaboration have also been given in TG-BEC covering the same. The 125% is NOT a multiplier being imposed to the anticipated system load but solely a criterion to avoid motor oversizing. For example, having the anticipated system load at 10 kW, the suitable standard motor rating shall be the 11kW. Then, having 11 kW/ 10 kW = 110% complies with the “not exceeding 125%” criterion.

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