All electrical and communication fixtures such as switch and lighting point, electrical socket outlets, communication line for telephony outlet, including SS door notice, rescue hatch and cat-ladder (both applicable to SS), blast hatch (applicable to S/C SS or scissor S/C SS) shall be provided inside the completed SS. The service conduits with electrical cables serving the SS shall be provided prior to commissioning.

A SS is considered commissioned only if the SS passes all the following tests in one inspection:

a. Light penetration test of SS door - an acceptable test method to check on light penetration into the SS is to use torchlight from the exterior of SS door. The test is considered to have passed if no light could be seen from the inside of SS.

b. Chalk mark test on the SS door - an acceptable test method is to apply chalk to the part of the door frame where the door seal will come into contact with when the door is closed. The test is considered to have passed if there is an unbroken and uniform transfer of the chalk markings onto the door seal when the door is closed and re-opened.

c. Air-tightness test of the SS - an acceptable test method is to pressurise the SS and measure the rate of pressure drop or the pressure difference between the interior and exterior of the SS. The *pressure gauge can be used for the test. The SS is pressurised by pumping air into the SS such that there is a pressure difference of 250 Pa* between inside and outside of SS. The SS is considered to have passed the test if the pressure gauge shows more than or equal to 50 Pa after 45 seconds.

Except in the case of S/C SS or scissor S/C SS, the ventilation sleeves of the SS, which have been closed for the commissioning tests, shall be opened after the tests to comply with Clause 6.4 for ventilation during peacetime.

* The pressure gauge used should have a dial size with a scale of 0 to 50mm or 0 to 500 Pa. (Note: 1 mm = 10 Pa).