2022年11月4日 · You can calculate from resistance of copper tables the expected rn and expect that r1 will be about the same then multiply by 1.67 in the case of modern cable (2.5/1.5=1.67) so a reading r1 = 0.60 ohm becomes 0.6 x 1.67=1.002 therefore you expect around 1 ohm reading then when crossing over E to L and vice versa r1 + r2 = 1.6 ohm / 4 = 0.40 ...

2009年6月26日 · Hi. If you are R1+R2 testing on a radial circuit then you simply isolate all power at the DB i.e main switch off, place a link between Line and Earth of the circuit you want to test, then go to the end of that circuit and measure the continuity between Line and Earth.

2024年9月21日 · R1+R2 is the sum of the resistance between line and earth. On a certificate there is a column handily titled R1+R2. It's in this column where the figure is entered. You don't add them together because they already have been during the test procedure. However, if you do the following (R1+R2) + Ze the answer is max Zs.

2019年9月30日 · if you consider the mid point of a ring, the current is shared equaly by each leg. so that equates to a divide by 2. the r1 reading is both legs in series do that equates to another dvide by 2. when you measure R1+R2 using the figure 8 connections, then all points will give the same reading , but in practice, the load sharing is only equal at ...

2024年9月21日 · 1) To obtain Zs in a radial circuit, you do Zs = Ze + (R1 + R2). "R1 + R2" value can be obtain for example, by connecting line and cpc at CU then connecting test probes to line and cpc terminal on socket e.g. cooker. You then add this single value to Ze. 2) To obtain Zs in a ring circuit, you still use Zs = Ze + (r1 + r2).

2015年6月29日 · Example. Say you wanted to know the expected measured (at 20C) R1+R2 of 2.5+1.5mm T&E, and you only had BS 7671 on you. VD for 2.5mm = 18mV/A/m = 18mΩ/m, which includes the resistance of both L and N, so a single cable of the same length contributes half this.

2010年10月1日 · So it's the r1, r2 & rn you have measured (lower case). It's very common for the r2 reading to differ from the x1.67 theory when testing an existing installation. Most often it would be lower due to the parallel paths however it can on occasion be higher according to cable csa or even simple connection methods.

2015年7月29日 · Upon undertaking a conditon report and the circuits have been energised for many years. Do you measure r1+r2 or just do Zs/Ze and calculate r1+r2. For socket circuits odviously the correct test procedure needs to be done. For example R1+R2 on a lighting circuit in small flat is say 2.50ohms you'd immediately know loose connection.

2011年11月25日 · This is r1, rn and r2 (lower case). The R1+R2 of the ring circuit is( r1+r2)/4 and is a mathematical check. The measured R1+R2 is the cross connection of line and cpc to create what is known as the figure of eight test and this should fall within 0.05 ohms of the mathematical check on a healthy ring and should also be carried out at each point ...

2021年9月13日 · R1 (L1) + R2 (E) R1 (L2) + R2 (E) R1 (L3) + R2 (E) for example. Click to expand... Yeah so that’s ok to link l1 l2 l3 all to earth and there for take reading at all 3 phase that’s maybe where iam getting mixed up then we must …