Encumbrance

Encumbrance indicates the effect that the weight of gear that a character is carrying has on his movement rate. There are 3 levels of encumbrance:

None/Light- The character can run and walk at full speed.
Normal-The character cannot run, but can walk at full speed.
Heavy-The character cannot run, the character walks at 50% normal speed.

The amount of weight corresponding to threshold between levels of encumbrance is dependent on strength and specified in encumbrance.2da. The table is repeated here for completeness:

Here is the updated data in the exact Wiki markup format you provided, with all values divided by 10 and split into two side-by-side tables.

Strength	Normal	Heavy
1	4	5
2	16	20
3	28	35
4	40	50
5	52	65
6	64	80
7	76	95
8	88	110
9	100	125
10	112	140
11	128	160
12	144	180
13	160	200
14	176	220
15	192	240
16	216	270
17	240	300
18	272	340
19	304	380
20	352	440
21	400	500
22	464	580
23	528	660
24	608	760
25	688	860

Strength	Normal	Heavy
26	784	980
27	88	110
28	1000	1250
29	1120	1400
30	1280	1600
31	1440	1800
32	1680	2100
33	1920	2400
34	2240	2800
35	2560	3200
36	2960	3700
37	3360	4200
38	3840	4800
39	4320	5400
40	4960	6200
41	5600	7000
42	6400	8000
43	7200	9000
44	8000	10000
45	8800	11000
46	9600	12000
47	10400	13000
48	11200	14000
49	12000	15000
50	12800	16000

PnP Comparison

Encumbrance has more severe repercussions in PnP, it restricts a character like armor: including restricting the Maximum dexterity bonus a character can add to Armor Class and introducing an Armor check penalty to skills. Encumbrance is also size dependent, smaller creatures can carry less weight than a large creature of the same strength before becoming encumbered. None of this was incorporated in NWN2.