28. A distributor shall provide, in respect of any existing or proposed consumer’s installation which is connected or is to be connected to his network, to any person who can show a reasonable cause for requiring the information, a written statement of—
(a)the maximum prospective short circuit current at the supply terminals;
(b)for low voltage connections, the maximum earth loop impedance of the earth fault path outside the installation;
the words I have highlighted in bold, are why Mike was saying “< 16 kA” and “< 0.35 ohms” (if it's normal PME) and “< 0.8 ohms” if TN-S. They only have to tell you the maximum not the actual … In fact, the actual values can change, and that gets more likely with embedded generation!
28. A distributor shall provide, in respect of any existing or proposed consumer’s installation which is connected or is to be connected to his network, to any person who can show a reasonable cause for requiring the information, a written statement of—
(a)the maximum prospective short circuit current at the supply terminals;
(b)for low voltage connections, the maximum earth loop impedance of the earth fault path outside the installation;
the words I have highlighted in bold, are why Mike was saying “< 16 kA” and “< 0.35 ohms” (if it's normal PME) and “< 0.8 ohms” if TN-S. They only have to tell you the maximum not the actual … In fact, the actual values can change, and that gets more likely with embedded generation!
