The provisions of the Philippine Electrical Code do not clearly state the requirements for accessibility and emergency exits around switchboards or switchboard doors. The PEC have two (2) clauses that provide the minimum requirements of working spaces.
Section 22.214.171.124(a)(1) Depth of Working Space. The depth of the working space in the direction of live parts shall not be less than that specified in Table 126.96.36.199(a)(1) unless the requirements of 188.8.131.52(a)(1)a, (a)(1)b, or (a)(1)c are met. Distances shall be measured from the exposed live parts or from the enclosure or opening if the live parts are enclosed.
Section 184.108.40.206(a)(2) Width of Working Space. The width of the working space in front of the electric equipment shall be the width of the equipment or 750 mm, whichever is greater. In all cases, the work space shall permit at least a 90 degree opening of equipment doors or hinged panels.
Figure 1 Depth of Working Space
The above sections only provide the requirements for working spaces but fails to set the minimum requirement for unimpeded access around switchboards and the width of emergency escape routes when working around or with switchboards. Emergency exit facilities do not only include means of egress but also an unimpeded escape routes which can be utilized during abnormal operating conditions.
Hopefully, the PEC committee will be able to include these provisions in the next publication of the PEC.